82 



CLASSIFICATION OF THE ANIMAL KINGDOM. 



ORDER IV. HETEROPODA (NUCLEOBRANCHIATA). 



Fam. a. Firolidse. Firola, Oarinaria. 

 Fam. 1). Atlantidse.- Atlanta. 



SUB-CLASS II. PULMONATA. 

 ORDER I. INOPERCULATA. 



Fam. a. Helicidse. Helix (Land-snail), Bulimus, Pupa. 



Fam. &. Limacidae. Limax (Slug). 



Fam. c. Limnaeidae. Limncea, Planorbis. 



Fam. d. Auriculidse. Auricula.- 



ORDER II. OPERCULATA. 



Fam. a. Cyclostomidaa. Cydostoma. 

 Fam. &. Aciculidse. Acicula. 

 Fam. c. Helieinidse. Helicina. 



(H. and A. Adams, The Genera of Recent Mollusca, London, 1858 ; 

 Keferstein, Malacozoa Cephalophora, in Bronn's Klassen und Ordnungen 

 des Thierreichs, 1862-66 ; S. P. Woodward, Manual of the Mollusca, 3d 

 ed., 1875 ; Huxley, On the Morphology of the Cephalous Mollusca, Phil. 

 Trans., 1853 ; Troschel, Das Gebiss der Schnecken, 1856 ; Stoliczka, Creta- 

 ceous Gasteropoda of Southern India, Palaeontologia Indica, 1868.) 



^ssS.^ 



X \- - ^=5_- 



Fig. 74. Gasteropoda. The Garden Snail (Helix aspersa). 



