134 SHELLS AND SHELL-FISH. PART I. 



tainty ; but we think it is represented by those species 

 which have the outer lip gibbous above, analogous to 

 Voluta Scapha and other strombiform types ; or it may 

 possibly be Lamarck's fossil genus Volvaria. It is easy 

 to perceive, however, how strikingly this sub-family, 

 as a whole, represents the Nassince. the Ehurnince, and 

 the ColumbellincB, all which are prototypes of the 

 Stro7nbid(T. 



(122.) We shall conclude our exposition of this 

 interesting family by what may be called a continu- 

 ation of the last diagram, for the purpose of illustrating 

 certain analogies in regard to the animals. 



Analogies of the Volutid^ to Vertehrated and Annulose 



Animals. 



Genera Sub-families Families Tribes of the Classes of Classes of 



i^f Af° S T^j°! Y Dithyra. Aniynals. Insects. 



Volutmcc. Murtcidce. Phitophaga. ^ 



Voluta. Cassince. Trochidcc. Atrachia. Mammalia. Aptera. 



Cymbiola. Muriclnte. HelicidcB. Macrotrachia. Aves. Ptilota. 



Harpula. Buccinirue. Turbidxe. Tubulibranchia. Reptilia. Annelides. 

 Volutilithes. Purpurince. Naticidce. Chelisoma. Amphibia. Vermes. 



Scaphella. Nassince. Haliotidce. Branchiopoda. Pisces. Cirripedes. 



It is chiefly with reference to the fifth set of types, 

 which contains the longest-bodied animals in all these 

 circles, that we have drawn up this table. A pecu- 

 liarity is of course shown in the Testacea, by the pro- 

 longation of the spiral whorls : hence we find the 

 longest-spired volutes are in the genus Harpula. The 

 BiiccinincB contains Terebra ; and the genus Turritella 

 is the type of the Turbidce. Continuing this analogy 

 on to the bivalves (Dithyra), we have the long tubular 

 snake-like shells of the Tubulibranchia, representing 

 the real serpents among vertehrated animals, and the 

 Annelides among the annulose or insect tribes. The 

 excessive developement of the organs of locomotion, or 

 foot, as shown in the first set of analogies, is most re- 

 markable. But as a chapter would be insufficient to 

 illustrate the innumerable analogies concentrated in this 



