CHAP. IIT. 



THE FUSIX^. 



89 



The best way, therefore, of testing this theory, is to 

 place these groups in separate columns, and to examine 

 the result. 



Analogies of the Turbinellid^e and the Cassid^. 



Sub- families of 

 TurbinellicUe. 



TURBINELLIN^. 



ScOLYMINiE. 



Fi;siNiNi:. 



PYRULINiE, 



EflURNINiE. 



Analogical Characters. 



C Shell large, ponderous, heavy, and 1 

 \ mostly smooth. J 



f Shells rough, muricated, and ge-? 

 \ nerally spined. j 



CBody of the animal, and spire of} 

 X the shell, excessively long. $ 



Spire always shorter than the ^ 

 aperture; the pillar straight and > 

 smooth. 3 



f Base and canal very short ; inner ^ 

 ■< lip ger)erally formed by a thick J- 

 C enamel. j 



Sub-families of 

 MuricidcE. 



Cassina. 



MUBICINiE. 



BUCCININ/E, 



PURPURIX^. 



NASSINiE. 



(76.) Without enlarging upon the evident traces of 

 a systematic series of analogies, running through the dif- 

 ferent groups here brought into juxtaposition, it is at 

 once seen that the PyrulintB and the Puj-purince actually 

 come opposite each other : and having already shown 

 (73.) how intimately their genera correspond, we may 

 pass into the next division. 



(77-) The FusiNiB are our last sub-family, and 

 are composed of those numerous shells arranged in the 

 genus Fusus of Lamarck, and are the most elegant and 

 delicate we have yet noticed. Their general form is 

 that of a spindle, tapering very much at both extremi- 

 ties : hence the spire is very long ; and as this contains 

 the body of the animal, the circumstance forms a ge- 

 neric character, both for the mollusk and its shell. The 

 canal is almost invariably long, and generally equals 

 the spire, while the basal volution is typically small : 

 the pillar is constantly destitute of any appearance either 

 of plaits or teeth, and the tip of the spire is acute : 

 this latter character, more especially, separates them 

 from the Turhinellince, where there are, in the aberrant 



