XXXVI CONTENTS OF VOL. Il. 
Page. 
Order I1.—Srptapa. 
1. Head surrounded with eight arms and two feet. 
Sepia, Loligo. 
2. Head surrounded with eight arms without feet. 
Octopus. Eledona.  Ocythoe. ; ; 431 
Class II1.—Pteropoda. 
Description. Tunic. Fins. Aerating Organs. . 440 
J. With a shell Limacina. Hyalea. . : 443 
II. Destitute of a shell. 
A. Fins double. Pneumodermon. Clio. Cleodora, 444 
B. Fin single. Cymbulia. ; ; 446 
Section I].—GasTEROpODA. 
Description. Cloak. Foot. Neck. Head. Snout. 
Tongue. : : : ib. 
Class I.—Pulmonifera. 
Description. Pulmonary cavity. Dextral and sinis- 
tral shells. Reproduction. ; : . 448 
Order I. Terrestrial. 
Subdivision I. Cloak and foot parallel. Arion. Li- 
max. Parmacella. Testacella. Veronicellus. On- 
chidium. : : : : 450 
Subdivision II. Cloak and foot not parallel. 
Tribe I. Foot with a lid. Cyclostoma., f 456 
Tribe II. Foot destitute of a lid. Helix. Bulimus. 
Pupade. Vitrina. Succinea. Achatina. - ib. 
Order IT. Aquatic. 
Subdivision I. Body protected by a shell. 
Tribe I. Shell spirally twisted. 
A. Shells turreted. Lymneus, Physa. Aplexa. 460 
