On the Family Proserpinacea. 13 



Fam. ANATID^E. 



Subfam. ANATINJE. 



411. Dendrocygna autumnalis {Linn.). 



412. Anas boschas, Linn. 



413. Dafila acuta (Linn.). 



414. Cairina moschata (Linn.). 



Fam. PELECAMDJE. 



Subfam. PELECANIX/E. 



415. Pelecanus fuscus, Linn. 



II. On the Family Proserpinacea, with Description of a New 

 Species of the Genus Proserpina. 



By Thomas Bland. 

 Read April 27, 1863. 



The most recent writer on the family Proserpinacea is Dr. 

 Gray, who, in his " Guide to the Systematic Distribution of 

 Mollusca in the British Museum," Part I. p. 188, 1857, thus 

 describes its characters. 



Order SCUTIBRANCIIIATA. 



Sub-order PSEUDOBRANCHIA. 



Gills in form of branched vessels on the inner surface of the mantle, 

 Body and shell spiral. The lateral central teeth large, irregular. Oper- 

 culum none. Terrestrial. 



These differ from Pulmonata in the mantle being free from the nape, 

 leaving the pulmonary cavity open, and in the animal being unisexual. 

 They differ from Phaneropneumona, with which they have hitherto 

 been united, in the teeth being truly Riphidoglossal* 



* " Teeth transparent, glass-like, in numerous longitudinal series ; the central 

 5.1.5, variable in form; lateral very numerous, more slender, curved at the 

 tip." — Gray, 1. c. 



