XXXV111 CONTENTS OF VOL. II. 



Page. 

 Order II. SEPIAD/E. 



1. Head surrounded with eight arms and two feet. 



Sepia. Loligo. 



2. Head surrounded with eight arms without feet. 



Octopus. Eledona. Ocythoe. . . 431 



Class II. Pteropoda. 



Description. Tunic. Fins. Aerating Organs. . 440 



I. With a shell Limacina. Hyalea. . . 443 



II. Destitute of a shell. 



A. Fins double. Pneumodermon. Clio. Cleodora, 444 



B. Fin single. Cymbulia. . 446 



Section II. 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. Cyclostorna. 4-56 



Tribe II. Foot destitute of a lid. Helix. Buliinus. 

 Pupadae. Vitrina. Succinea. Achatina. . ib. 



Order II. Aquatic. 



Subdivision I. Body protected by a shell. 



Tribe I. Shell spirally twisted. 



A. Shells turreted. Lymueus, Physa. Aplexa. 460 



