42 PHRONTIS. 



X. CRAssA. Koeh. PI. 13. tigs. 18S-I90. 



Yellowish or greyish, with usually a superior wliite baud. 

 Very thick, ribs rather small, brokeu iuto grauules. 



Length. ■(\--~i\ iuoh. 



China, Viti Isles. 



Fig. 188 is a copy ol" the type, snid to come from China, but 

 that locality is doubtful : the more usual form of the species is 

 that of flg. 189. ^V. semisiilcnta, Hombr. et Jacq. (fig. 190). is a 

 synonym. The sj^ecies is remarknlilc for the ixmdcrous thick- 

 ness of well-grown individuals. 



N. MiOA. Briig. PI. 13. ligs. 191-193. 



Obliipu'ly costate. costa* sigmoid, with close revolving stria' 

 which are frequently obsolete on the body whorl except its 

 lower part. Yellowish or orange-red, banded; or sometimes 

 parti-colored on the body whorl, the lower portion being darker. 



Tjcugth, 'ri-'T inch. 



West Africa. 



Fig. 192 repivsents ;in elongated' variety, and tig. 193 is X. 



ohJiqueplicala . I) linker. 



N. AMBKii-A, Mont. PI. 13. tigs. 194-197. 213. 



Narrowly slioiildere<l. ril)s pretty close, crossed as wi-ii as the 

 interstices by hue revolving lines. White or yellowish, generally 

 banded. s|)ottcd or maculated with brown. Length, •4--55 inch. 

 West Indies, West Coast of Africa. —Danker. 



First desciibed by Montagu as a British sjjecies. and occa- 

 sionally found on the western shores of Europe, l)ut its 

 occnri'euce is adventitious. Its more scalariform spire, liner 

 sculpture, color, absence of the strong nodules, and narrow, 

 defined columella callus will serve to distinguish it from N. 

 ribe.i:. Say. The synonyms are .Y. AuiiUarinii (tig. 194), N. 

 Ga.ndri. (flo-. 19.5) and A'. Hotessicri. (fig. 190), all of (POrb., and 

 all immature shells, of different ages ; and N. arufa. Say (fig. 

 197 ), probably. Y. con.s-e»h-fl, Kavenal. is very poorly described 

 from a single specimen found in a fish at Charleston, S. C. It 

 is probably this species. 



1/' N. viBEX, Say. PI. 13. figs. 198-207. 



Spire turrited, angulated by a nodulous series on each whoi'l. 

 body with a rather broad, sloping shoulder, the border of which 



