^^^ MOLLUSCA. 



form of the columella, furnish the grounds of its division into 

 genera, which may be variously grouped(l). 



CoNus, Lin. (2) 

 So called from the conical shape of the shell, the spire, either per- 

 fectly flat, or but shghtly salient, forms the base of the cone, the 

 apex bemg at the opposite extremity, the aperture is narrow, ;ecti- 

 hnear. or nearly so, extending from one end to the other without 

 enlargement or fold, either on its edge or on the columella. The 

 rr" :l TT' " ^^^^P-^--^ to the narrowness of the 

 p r are through whxch it issues, its tentacula and proboscis are 

 highly protractile, the eyes are placed on the outer side of the 

 ormer, and near the point, the operculum, situated obliquely on 

 the h,nd part of the foot, is too narrow and short to close the whole 

 oi the aperture. 



beaTuff.t'^f ^ '^'" ^'""'' ^'^"^ "'^''^"y ornamented with the most 



Z2rf '^r';? '''' '""" "^ ^^'^^"^^^' The seas of Europe 

 produce very few(3). ^ 



p re; by he whorls being tuberculated or not; by its being more 

 salient and even pointed, and furnished, or no,, with tubercles 

 thel^'r' T f""; '" "'"'^ "= ''''"' '" '"ffi^ently salient to give 



ir'.iiTu';:.'!.':;;:);'''^^"""' '" "'"^- '^-^ " --^ '- ^'"^- -<"' 

 deltitiTbtcrs"' """""' ^^'" '^ ^"""' '" ''^' ''''^' - -- 



Cypr^a, Lin. 

 The spire projecting but little, and the aperture narrow and extend- 



In placing here the genera with a straight aperture, we must not be understood 



therfi 7 ''""'"I' ''' ^ ^'" P--^^^^'"^ ^-''y' butonlyto p sent 

 ^!:^:r' ''' ^^^"^^^-te. of an those wLh i:e Z 



(3) For the species of this beautiful genus see the article and the plates of 

 Brug.eres m the Encycl. Method., where they are extremely well d crfb d and 



and'of thictth'"''" ' """"''' 'P"'" '''"' "^""''^'' ^^ ^ ^'-" --'^ nought for, 

 and ot which there are many varieties, Encycl. Method nl '^16 f i r 



, , i^iic, pi. ^17^ t, 5;~Co7i. arenatus, Brug., Encycl, n] '520 f fi fc^ 



Speces with a simple spire: Con. Ktteratus, L., E.cyc n] 303 f 1 ' rl 



ug., n^nc, pi. 0^6, f. 7i~Cm. virgo, Bnig. Enc. pi. 326, f. 5, &c. 



