INVERTEBRATE ANIMALS. 39 



Group 114.— Sub-family HELICIN^. Part II. The up- 

 turned mouth of Anostoma indicates that the adult 

 animal must move with the spire of the shell downwards. 

 The West Indian tribe allied to Lucerna Macrocyclis 

 includes some of the largest and the smallest of the 

 Helices. Estimated number of species : recent, 200 ; 

 British, 6 ; fossil, a few. Tertiary. 



^ Examples of Acavus, Cochlea, Lucerna, Macro- 

 cyclis, (&c., including a fine series of the rare 

 Malayan genus Geotrochus. 



Group 115.— Sub-family HELICINiE. Part III. Esti- 

 mated number of species : recent, 200 ; British, 3 ; fossil, 

 a few. Tertiary. 



IT Examples of Streptaxis, Helix, Helicostyla, dc. 

 In the Philippine Islands the Helices attain their 

 highest beauty of form and colour; e.g., Cal- 

 licochlias, Corasia, and Helicostyla. 



Group 116.— Sub-family PUPIN^. Pii.jya, a doll. Esti- 

 mated number of species : recent, 574 ; British, 16 ; 

 fossil, 50. Tertiary. 



51 Examples of Pupa, Clausilia, Cylindrella, dc, 

 and of most of the generic forms in this 

 extensive group. 

 Note the form and sculpture of some of the more 

 slender species of Cylindrella, a West Indian 

 genus. 



Group 117.— Sub-family BULIMIN^. Part I. ^o6\iiJ.os, 

 hunger. Estimated number of species : recent, 480; 

 British, 5 ; fossil, 0. 



11 Examples of Orthaliciis, Bidimidus, dec. For 

 the geographical distribution of the Bulimi, 

 see tho tablets' 

 Note the delicate texture of the shells in the paper 



