304 MOLLUSCA. PECTINIBRANCHIA. Turritella. 



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

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

 subovate. 



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



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



Length ith 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. Mmit. Test. Brit. Supp. 129 — English and Scottish shores, 

 rare. 

 Length nearly y'oths of an inch; breadth less than j'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. carinatida. — Whorls seven to ten, bent towards the 

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

 nated aperture. 



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

 arcuatus, Adams., Linn. Trans, iii. GG. 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 day. 



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. 

 — In London clay. 



3. T. breviss — 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. 11 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. muricata Whorls flattened on the upper side ; spirally striated, with 



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

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

 Bay. 



7- T. cingenda Whorls %vith a round crenated band upon the lower edge ; 



spirally striated ; the upper whorl with transverse ribs Soiver. 3Iin. Conch. 



1. t. xcix. f. 3. — In shale with the last, Robin Hood's Bav. near Scarborouarh. 



