APPENDIX. 365 
ferent genera: theyare all pedunculated and agglutinated into masses, 
resembling bunches of grapes ; they are deposited in the bottom of 
the ocean, generally in very deep water, and most commonly on sandy 
bottoms ; they are frequently thrown up on the low sandy shores of 
our coasts after hard gales of wind, and are sometimes found depo- 
sited in sandy pools at the lowest ebb-tides. 
CLASSIS II. PTEROPODA. 
Pteropoda, Cuvier. 
Corpus oblongum, membranaceum, nec pallio nec pede instructum. 
Caput bilobum, rotundatum, sepius exsertum, tentaculis nonnullis 
minutis instructum. Os labiis mimutis carnosis et lmgua im- 
structum. Oculi duo, laterales, aut superi. Branchie due, 
branchiales membranacez, reticulate (alas referentes), ad colli aut 
ad capitis latera externe locate. Sexus hermaphroditus. 
The animals of this Class inhabit the ocean, most generally far 
from any land ; they swim like the animals of the Class Cephalopoda, 
but never rest on any floating or other substances, and only appear 
on the surface when it is perfectly calm. Their branchie or gills, 
resembling wings, varying in their form in the different genera, and 
sometimes species, serve the double functions of respiration and 
locomotion. 
The liver in most of the genera is rather larger than in the Class 
Gasteropoda. 
Genus CLIO. 
* Corpus nudum, gelatinosum, oblongum, turbmatum, natans. Ca- 
put exsertum tentaculis pluribus minutis retractilibus, in fasciculis 
duobus onustum. Ocuwliduosuperi. Osterminale. Pinnz duz 
branchiales, obovate, opposite ad colli basin lateraliter insertz. 
Anus et generationis apertura infra pmnam, in latere dextro, collo- 
eati.””— Lamarck, Hist. Nat. des Anim. sans Vert. vii. 286. 
The body is naked, gelatinous, oblong, turbinated and formed for 
swimming. The head is exserted, laden with many minute retrac- 
tile tentacles arranged into two bundles. Two eyes are situated on 
the upper part of the head. The mouth is terminal. Two branchial 
oblong-ovate fins are situated opposite each other on the sides of 
the neck. The aperture named the anus and that of the organs of 
generation are situated beneath the fin on the left side of the body. 
