Origin of Species Variorum

→ It then 1866

Afterwards these larvæ 1869

→ had been 1866

were to become 1869 1872

→ and especially that of the first larval stage, would probably have been 1866

would probably be 1869

of the new class would be 1872

→ is actually the case; and it should be especially noted that 1866

it now is; and 1869

of our existing insects; and 1872

→ would not have 1866

certainly would not 1869 1872

→ insect. 1866

adult and ancient insect. 1869

adult and ancient form. 1872

→ ancient and adult 1866

OMIT 1869 1872

→ group. 1866

group in its adult condition. 1869

group in its adult state. 1872

→ in their first larval state under a similar 1866

at first as larvæ under the 1869 1872

→ an 1866 1869

at some very remote period an 1872

→ at a remote period, and has 1866

at some very remote period, and 1869

and 1872

→ through long-continued modification 1866

OMIT 1869 1872

→ all the members in these four great classes 1866

these animals 1869 1872

devour

devours

them.

it.

→It then

undergo

undergoes

a complete change;

their

its

eyes disappear;

their

its

legs and antennæ become rudimentary, and

they

feed

feeds

on honey; so that

they

now more closely

resemble

resembles

the ordinary larvæ of insects; ultimately

they

undergo

undergoes

a further

further

transformation,

transformations,

and finally

emerge

emerges

the

perfect beetle. Now, if an insect, undergoing transformations like those of the Sitaris, →had been the progenitor of

the

whole

new

great

class of insects,

their

the

the general

course of

develop- ment

development

development,

→and especially that of the first larval stage, would probably have been widely different from

that

what

→is actually the case; and it should be especially noted that the first larval stage →would not have

represent

represented

the

former

adult

condition of any →insect.

On the other hand it is

highly probable

probable

that with many

~~groups of~~

groups of

animals the

embryonic or

earlier

larval stages

show us, more or less completely, the

state

condition

form

of the →ancient and adult progenitor of the whole →group. In the

great

enormous

class of the Crustacea, forms wonderfully distinct from each other,

namely,

as the

suctorial parasites, cirripedes, entomostraca, and even the malacostraca, appear →in their first larval state under a similar

nauplius-form;

nauplius form;

and as these larvæ

live

feed

and

feed

live

in the open sea, and are not adapted for any peculiar habits of life, and from other reasons assigned by Fritz

Müller,

it is probable that →an independent adult animal, resembling the

Nauplius,

nauplius,

~~formerly~~

formerly

existed,

existed

→at a remote period, and has subsequently produced, →through long-continued modification along several divergent lines of descent, the

~~several~~

several

above-named great Crustacean groups. So again it is probable, from what we know of the embryos of mammals, birds, fishes, and reptiles, that →all the members in these four great classes are the modified descendants of some

~~one~~

one

ancient progenitor, which was furnished in its adult state with branchiæ,

~~had~~

had

a swim-bladder, four

fin-like

simple

limbs, and a long

tail,

tail

all fitted

fitted

for an aquatic life.