RECORD: Darwin, C. R. n.d.  Number of arms in Polypus of the Flustraceæ varies. CUL-DAR5.B98-B99. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)

REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 12.2021. RN1

NOTE: See record in the Darwin Online manuscript catalogue, enter its Identifier here. Reproduced with permission of the Syndics of Cambridge University Library and William Huxley Darwin.


[B98]

That the number of arms in Polypus of the Flustraceæ varies from 8 to 28 & is no more than a specific character: That a proportion is kept up between simplicity of Polypier & number of arms. – that the same essential organ are found in very varying forms of Polypier. That the degree of stony nature in Corallinas is entirely futile as a character.

That the orders of Lamouroux of Cellepora. Celleria & Flustra should be included in one family (probably also some Escharæ & Milleporæ).

That one Sertularia is also included.

That the structure of the Flustraceæ is most widely different from the Clytias not only in the Polypus, but in the generation in the former case each ovule & Polypus has some intimate connexion in the latter it is a young Polypus altered. (Manner of growth?)

General Anatomical discussion.

(Study Hydra & Actinia & my Madrepore & Sigillina in Blainville) (Sigillina & Polypus

That the connexion of the cells although not apparent in the true Flustræ must exist: from similarity in growth & chain of gradation in the Capsule Flustræ: & in the Flustra of P 234 & true Flustræ & Cellariæ having same body.

That the Polypier is the essential part in the Corallines, it produces the cells & young in young Polypi (& after death of Polypus consequent on generation reproduces them?)

That the mere possession of arms has grouped very heterogenious animals.

That Corallina is a plant. Does it not emit in Suns rays gaze.

 

[B98v]

In Virgularia does the truncate extremity correspond to extremity of branch root in Corallium? Examine extremities & the bag to extremity of branch. The relative position of Polypier, with living mass in the Lamelliform.

The structure of transparent extremities of Corallina. Regrowth of Corallines when separated.

In the capsule Flustræ, cells without Polypi have capsules (Moveable)? Yes? I believe strong proof of disconnection.

[B99]

A close connection & co-sensation between the Polypi of many Corallines is established by the co-movements of "Capsules Flustras" of the setæ in Crisia: the flashes of light in Clytia: strongly seen in Virgularia, & in Alcyonium an injury in the stem causing all to collapse: whilst one lowest being injured did not affect the mass.— on the other hand, one point in a Synoicum Blain: affected all round it for some distance.

Have not the Escaræ in the growth of the Polypier an analogy with the Celleporariæ: where cells appear formed in a cellular tissue (or group of hoods, or angular tubes as in Favosites) of a stone?

A cell reproduces its Polypus

The stony striæ, on outside of Lobularia, connecting link with stony Zoophites.

The Lobated (8vo) position of tentacula in Chiloe Actinia perhaps is an analogy in change between a Caryophyllia & Gorgonia or Corallium? it shows a passage of this arrangement, without material change in animal.

It is important to see in Clytia, substance included in a young cell appearing equally ready to form Polypus or Ovules - the Coralline must produce this matter; not the Polypus the gemmule.

I am inclined to think in Corallines, such as Tubularia & Flustra, the Polypier is as much a living being as any Plant, (as a Lichen or Corallina) that it communicates with the circumambient fluid either simply as in Clytia, or in more complicated manner, as in Flustra.

 

[B99v]

How little organization can be seen in Corallina yet even the basal articulation produce paps with gemmules. – In the Polypier of the Flustraceæ it seem to make little difference, whether a central living axis is clearly visible or whether it (probably) form in them fold at the base of cell, in the encrusting Flustraceæ.

I imagine in the Lamelliform Coralls, the Polypier is only an external secretions (a big axis to give support) the Polypier being there the mass of living matter: we see it this in Virgularia. There is an analogy between the Corall-forming Polypier & turf-forming plants. Hence here the soft matter ought to form the gemmules, as in the hard matter in the other cases. I think there is much analogy between Zoophites & plants the Polypier being buds; the gemmules influence which forms a bud & young plant in Sertularia, the Capsules with gemmules appear to have no relation with any one Polypus; how could it form & totally different sort of capsule to its own & in a place where it the Polypus is never found.

In Lamarck good account of Lombarias


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Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)

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