CHAP. V. 



CONINE, OR CONES. 



145 



and, as such, may be readily procured by every student 

 who feels interested in these inquiries. 



Analogies of Types of the Genus STROMBUS. 



By arranging the intermediate species between each 

 of these types, the whole would exhibit another set of 

 relations, as well as a series of connecting links ; thus 

 Auris-DiancB is followed by a little group composed of 

 tricornis, gallus, and Peruvianus, which connect the for- 

 mer shell with S. gigas : but the student, after these 

 hints, will find no great difficulty in following up the 

 theory himself. 



(135.) The next genus, Rostellaria, is particularly 

 interesting to the lover of analogies, inasmuch as all the 

 types are not only existing, but are of that definite 

 character which leaves no doubt of their true import. 



Species of 

 Hostel/aria. 



Serrata Sw.* 



Macroptera. 

 Columbata. 



Rectirostris. 

 Fisturella. 



Analogies of the ROSTELLARI^E. 



Analogies. 



r Outer lip reaching to the tip off 

 < the spire, and divided into pro- > 

 C cesses. 3 



Outer lip very large, and entire. 

 ("Outer lip hardly attached to the 7 

 i spire, and dilated into a lobe. 3 

 C Outer lip not dilated at the top, ) 

 1 and not extending on the spire. 3 

 ("Outer lip hardly dilated, but the") 



*c 



J siphon ascending to the apex I 

 J of the spire ; the margin with-f 



Genera of 

 Strombintr. 



PTEROCERA. 



STROMBUS. 

 APORRHAIS. 



STROMBIDEA. 

 ROSTELLARIA. 



* out teeth-like processes. 



Figured in Chemnitz, pi. 195 A. fig. 1869. 

 L 



