Elenchus generum. 



Sect. I. Mollusca cephalophora Mke. — p. 1. 

 Class. TI. Pteropoda Mke. — p. 1. 

 Fam. I. Hyalaeacea Mke. — p. 1. 



1. Cleodora Lam. — p. 1. 



Class. III. Gasteropoda Mke. — p. 2. 

 Ord. III. Hypobranchia Mke. — p. 2. 

 Subord. I. Phyllidina Mke. — p. 2. 

 Fam. III. Ancylea Mke. -— p. 2. 



2. Ancylus Geoffr. — p. 2. 



Ord. IV. Pomatobranchia Mke. — p. 2. 

 Fam. III. Acera Mke. — p. 2. 



3. Bulla Linn. — p. 2. 



Ord. V. Coclopnoa gymnostoma Mke. — p. 3. 

 'Subord. I. Geophila Mke. — p. 3. 

 Fa m. II. Ilelicea Mkc. — p. 3. 

 Trib. I. Tetracera Mke. — p. 3. 



4. Helicophanta Pfeiff. — p. 3. 



V. Nanina J. E. Gray. — p. 4. — Tanychlamys W. H. Ben- 

 son (nov. 1834.) — p. 4. 



6. Helix Linn. — p. 6. 



7. Zonites Montf. — p, 13. 



8. Caiocolla Lara. — p. 13. 



