CHAP. IV. PRIMARY DIVISIONS, THEIR ANALOGIES. 99 



vtry large, but the mantle not lobed or reflected. 



Ofc. 6.)* 



(88.) These primary divisions having long been ad- 

 mitted by all writers, we shall at once compare them 

 with those of the predaceous Zoophaga. 



Analogy of the VOLUTID^E and the ZOOPHAGA. 



Analogies. 



Sub-families of the 

 Volutidte. 



Families of the 

 Zoophaga. 



VOLUTINA. 



MITRIN& 



ANCILLARINjE. 



MARGINELLIN*. 



("Foot of the animal excessively } 



< large ; base of the shell trun- > 



t cate. 3 



( VolutiiKE and Cassirus.) 



Foot small, not so long as the 

 hell, the base of which is con- 



rFo< 



1 \ 



racted. 

 (Mitrirue and Scolymus.) 



{Spire very short ; tip papillary ; > 

 pillar plaited. J 



Spire nearly or quite concealed. 



f Outer lip detached and thick- ? 

 i ened. j 



Muricidce. 

 Turbinellid*. 



Volutidce. 



Cyprtsid.ee. 



Strombidce, 



Thus, the truncated and wide-mouthed helmet-shells, 

 among the Muritida, find their prototypes in the melon 

 volutes ; and the muricated mitres, in the sub- typical 

 Turbinellida, with which they also agree in their fu- 

 siform shape. The Olivince correspond to the typical 

 volutes, in having their foot excessively large. The ani- 

 mal of Ancillaria is unknown ; but, from the high polish 

 of the shells, we may suppose it is analogous to the 

 cowries. Lastly, the Marginellince are clearly proto- 

 types of the StrombidfSj as they are the only volutes 

 which have the top of the outer lip detached from the 

 body- whorl. 



(89.) The weakest point in the foregoing table is 

 that, perhaps, which relates to the AncillaricB ; but, by 

 comparing the family with the Cassidce, the station of 

 this group will be more clearly shown. 



* The annexed cut is from one of the unpublished drawings of Guilding; 

 the shell is pure white. 



H 2 



