APPENDIX, No. IIL.’ 405 
of its form being distinguished; upon moving the speck it fell 
out of its place, 
On the 12th the embryo was indistinctly seen, 
On the 15th the embryo filled + part of the egg, but the dif- 
ferent parts were still indistinct. 
On the 18th the body of the embryo had become larger, and 
the covering thicker, 
On the 19th, the coverings or shells of all the eggs were more 
or less dissolved, so much so that Mr. Hunter thought all the 
eggs were rotting, and the whole brood of young would be lost. 
On the 20th, the young were hatched, and the shells com- 
pletely formed, 
On the 23d, when the young snails were put in water, their 
bodies came out of the shell as in full grown snails. 
On the 24th, they all deserted their nests. 
The specimens of the sepia found inthe argonaut shell, which, 
was caught by Mr. Crancu, in this expedition to the Congo, 
had deposited some of its eggs in the involuted part of the 
shell, and the animal being fortunately caught in the shell iden- 
tified the eggs to belong to it; (PI. XIV.) they are united to- 
gether by pedicles, like the eggs of the sepia octopus, and in 
all other respects resemble them; they differ from those of 
the helix janthina and the other vermes testacea, that live in 
water, in having no camerated nidus, and in having a very 
large yelk to supply the young with nourishment, after they 
are hatched. 
Upon these grounds, this animal must be resolved into a spe- 
cies of sepia, an animal which has no external shell, and only 
uses the shell of the argonaut, when it occasionally gets pos- 
session of one, 
Some naturalists, unacquainted with comparative anatomy, 
have asserted that in these eggs they saw the argonaut shell 
