304 MOLLUSCA. PECTINIBRANCHIA. Turritella. 



Length |ths of an inch; white, slender; whorls slightly elevated; the 

 spaces occupied hy the depressions larger than those of the ridges ; aperture 

 subovate. 



222. T. nitidissima. — Whorls nine, rounded, smooth. 

 Turbo nit. Mont. Test. Brit. 299. t. xii. f. 1 Among fine sand, rare. 



Length |th of an inch ; slender, pointed ; brownish-white, glossy ; whorls 

 much rounded and oblique ; aperture ovate, pillar-lip rounded. 



223. T. indistincta. — Whorls eight, flattened, ribbed trans- 

 versely, striated spirally. 



Turbo ind. Mont. Test. Brit. Supp. 129 — English and Scottish shores, 

 rare. 



Length nearly T s 5 ths of an inch ; breadth less than /gth ; colour brown, with 

 darker spiral bands, glossy ; separating line deep ; transverse ridges numerous, 

 rounded, waved, wanting on the lower part of the body-whorl, where the 

 spiral striae are most conspicuous ; these last do not cross the ridges, but 

 merely occupy, though faintly, the furrows. Montagu described this beauti- 

 ful species from the Boysian cabinet. I obtained my specimen, which is 

 quite fresh, from Loch Broom. 



224. T. carinatula. — Whorls seven to ten, bent towards the 



apex, with numerous transverse ribs, with a contracted margi- 



nated aperture. 



Turbo turritus carinatus, Walk. Test. Min. 12- t. xi, f. 44. — T. sub- 

 arcuatus, Adams, Linn. Trans, iii. 66. t. xiii. f. 27-28 — On the English 

 coast. — An obscure species. 



EXTINCT SPECIES. 



1. T. conoidea Whorls about eighteen, lower part of each angular, slightly 



projecting, longitudinal striae equally distant, seven or more, with intermediate 

 smaller ones, all acutely crenulated — Sower. Min. Conch, t. xli. f, 1. 4. — In 

 London clay. 



2. T. elongata. — Whorls about fifteen, flattened in the middle, lower parts 

 projecting ; striae more distant near the middle of the whorls, inconspicuously 

 crenulated, with some finer intervening striae — Sower. Min. Conch, t. xli. f. 2. 

 — I n London clay. 



3. T. brevis, — Whorls about twelve ; spire rather short ; upper and lower 

 parts of the whorls equally rounded ; striae ten or twelve, finely crenulated. — 

 Sower. Min. Conch, t. xli. f. 3 — In London clay. 



4. T. incrassata. — Whorls about fourteen, flattish, with the lower part an- 

 gular, and three smooth longitudinal threads ; outer lip thickened in the mid- 

 dle. — In Crag, Holywell. 



5. T. edita. — Whorls about twenty, rounded, slightly depressed in the mid- 

 dle ; lower parts rather prominent, with many obscure longitudinal striae. 

 /Brander, Foss. t. iii. f. 48.) Sower. Min. Conch, t. xli f. 7- — In London clay. 



6. T. muricala — Whorls flattened on the upper side ; spirally striated, with 

 transverse ribs rising into small spires at the outer sections. — Soicer. Min. 

 Conch, t. ccccxcix. f. 1-2.— In Coral Ray, Steeple Ashton, and Robin Hood's 

 Bay. 



7- T. cingenda.— Whorls with a round crenated band upon the lower edge ; 



spirally striated ; the upper whorl with transverse ribs Sower. Min. Conch. 



1,1. xcix. f. 3. — In shale with the last, liobin Hood's Bay, near Scarborough, 



