CiXGULA. MOLLUSCA. PECTINIBRANCHIA. 305 



8. T. Urll. — Elongated, striated transversely. lire's Hist. Ruth. 308. 

 t. xiv. f. 7- — Limestone of the Coal Formation. 



9. T. elongata. — Elongated, striated spirallv. I'^re's Hist. Ruth. 308. t. xiv. 

 f. 11. 



10. T. constrida. — Turrited, smooth ; whorls eight or ten ; convex below, 

 contracted above, with an adpressed crenated margin. Turbo con. Mart. Derb. 

 t. xxxviii. f. 3 Melania con. Sower. Miir. Conch, t. ccxviii. f. 2 Carboni- 

 ferous Limestmie. 



Gen. L. CINGULA. — Aperture of the shell with the peristome 

 complete, being united retrally. 



* Outer lip thickened hy a rib. 



225. C. cimex. — Whorls four, strong ; ribbed coarsely, trans- 

 versely and spirally. 



Turbo cim. Linn. Syst. Nat. i. 1233. Don. Brit. Shells, t, ii. f. 1. Mont. 

 Test. Brit. 315 — Southern coasts, not common. 

 Length about gth of an inch; white; whorls with the separating line deep 

 and ragged ; meshes of the ribs forming quadrangular pits, in six rows on 

 the body-whorl, and two on the second. 



226. C. sithcarinata. — Whorls three, little produced, with 



three spiral ridges, and numerous transverse striae. 



Helix sub. Mont. Test. Brit. 438. t. vii. f. 9 — Trochus rugosus, Broivn, 

 Wern. Mem. ii. 520. t. xxiv. fl 5. — Coasts of England and Ireland. 



Breadth about y'^th of an inch, depressed ; glossy, frosted ; two of the spi- 

 ral lines are on the lower part of the body-whorl, and one on the upper ; pil- 

 lar-cavity wide and deep; aperture oval. 



227. C. calathisca. — Whorls six, with numerous transverse 

 and spiral ribs. 



Turbo cal- Laskey., Mont. Test. Brit. Supp. 132. t. xxx. f. 5 — West 

 coast of Scotland and England, rare. 

 Length ^th of an inch ; brown ; conical ; the pits formed by the intersection 

 of the ribs are more numerous than the last, being in eight rows on the body- 

 whorl, and four on the next ; aperture with the outer lip denticulated within. 



228. C. striatula, — Whorls five, spirally ribbed, longitudi- 

 nally striated, each terminating in a flat top. 



Turbo stri. Mont. Test. Brit. 30G. t. x. f. 5 — Turbo monilis, Turton, 

 Conch. Diet. 200 — On the English coast, rare. 

 Length y-gths of an inch ; ovate, obtuse, white ; whorls with fine spiral 

 striae, which, towards the upper part of each volution, rise into three mem- 

 branaceous ridges ; those near the pillar are likewise elevated and strong ; the 

 transverse striae are numerous, but principally obvious in the furrows, yet 

 giving to the shell a pretty cancellated appearance ; aperture suborbicular, 

 angulated at the upper part. 



229. C. costata. — Whorls five, spirally striated, and trans- 

 versely ribbed ; a groove behind the outer lip, extending behind 

 the pillar to the aperture. 



Turbo crassus, clathratus, quinque anfractibus apertura rotunda margi- 

 VOL. I. U 



