edition, from tlie Proc. Acad. Nat. Sci., I will not repeat them here. See 
Index. — Ed.] 
Planorbis glabbatus, 
Lymn.®a columella, 
Cyclostema, 
‘ ‘ TRICARINATA, 
Paludina, 
“ limosa, 
‘ ‘ LAPIDARIA, 
Alasmodonta, 
Arcy^us, 
u 
RIVULARIS, CyRENA, 
Cyrera Carolirersis, Bose. 
MARGIRATA, 
[No. 2. From the Philosophical Transactions of the Royal Society, 
1819, p. 107.] 
On the Genus OGYTHOE ; being an extract of a letter from 
Thomas Say, Esq., of Philadelphia, to Wm. Elford Leach, 
M. D., F. R. S. 
I have before me a specimen of Ocythoe in an Argonauta, form- 
ing part of the collection of the Acad. Nat. Sciences. It was 
taken from the stomach of a dolphin, which was caught in sound- 
ings on our Atlantic coast, and is in the most perfect state of pre- 
servation, not having suffered the slightest decomposition from 
gastric action. 
It is sufficiently distinct from your 0. Cranchii, as well as from 
the animal of Nautilus sulcatus of Klein and if the figure given 
by Shaw of the animal of Argonauta argo has any pretensions 
to accuracy, it is most probably an unknown species. 
I here attempt a description of it, and also submit a few remarks 
on the genus : 
Ocythoe punctata. — ^Body pale, punctured with purplish^ 
abdomen conic-compressed, vertical, semifasciate near the sum- 
mit, with a profoundly indented transverse line ; arms much longer 
than the body, attenuated, filiform at their tips, alated ; membrane® 
rounded. 
Inhabits the Atlantic Ocean near the North American coast. 
Descrip. Abdomen conical, slightly compressed, nearly vertical 
with respect to the disk of the head, with a profoundly indented 
transverse line, which extends half round, near the summit. Arms 
attenuated, much longer than the body, filiform towards the tip, 
slightly varied with brassy, inferior ones when extended double 
the length of the body; suckers alternate, becoming gradually 
smaller towards the extremities of the arms, where they are very 
