360 MOLLUSC A. CERITHIADiE. Sigaeetcs. 



2. R. rimosa. Fusiform, whorls slightly convex, longitudinally ribbed, 

 transversly striated ; lij) reflected, with a sinus at the inferior edge, below an 

 expansion of the margin, and a canal at the superior edge, extending nearly 

 the length of the spire ; beak straight. {Mureje rimosics, Brander, f 27.) — 

 Sower. Min. Conch, t. xci. f. 4, 5, 6 London Clay. 



3. R. macroptera — Fusiform, smooth ; lip large, nearly circular, with a ca- 

 nal extending along the spire ; beak straight, pointed. {Strumbus amplus, 

 Brander, f. 76.) Sower. Min. Conch, t. ccxcviii, ccxcix, ccc. — In London 

 Clay. 



4. R. Parkinsonii Subfusiform ; whorls seven or eight ; convex, with lon- 

 gitudinal ribs, and numerous transverse striae ; outer lip dilated ; armed with 

 one styloid process, beneath which is a broad truncated expansion. Rostella- 

 ria, Park. Organic Remains, iii. 63. t. v. f 11. R. Park. Mantell. Suss. 72, 

 and 108. t. xviii. f. 1, 2, 4, 5, 6, 10. — In Green Sand and Grey Chalk-marl. 



5. R. Sowerbii. — Turrited, costated, transversely striated ; last whorl tri- 

 carinated ; aperture expanded, with a one-angled entire lip ; superior canal 

 short. — R. Parkinsonii, Sower. Min. Conch, t. cccxlix. f. 1, 5. — London Clay. 



6. R. calcarata. — Turrited, costated, transversely striated ; costce linear, 

 curved ; last whorl carinated ; outer lip furnished with a large oblong process, 

 the upper angle of which is formed into a long curved spire ; beak pointed ; 

 superior canal obtuse. Park. Org. Rem. iii. 63. t. v. f. 2 — Sou'er. Min. Conch. 

 t. cccxlix. f. 6, "].— Green Sand. 



Gen. LXXXIV. SIGARETUS.— SheU patulous, imbedded 

 in the cloak, the anterior sinistral margin of which is 

 notched at the brancliial opening ; tentacula two, with the 

 eyes at the external base. 



355. S. haliotoideus. — Tentacula short, flat, the foot rounded 

 behind. 



Bulla hal. Mont. Test. Brit. 211, Shell t. vii. f. 6, Animal vig. 2. f. 6 



In deep water, not common. 



SheU |ths in length, and |ths of an inch in breadth ; oval, depressed, pel- 

 lucid, whitish, wrinkled by the hnes of growth ; whorls two, the first very 

 small, forming the rudiment of a spire near the margin, the second rapidly 

 increasing and fonning a shallow basin ; outer lip thin, inner lip concave, 

 and slightly inflected. Animal oval, convex ; skin tough ; cloak broad, di- 

 vided from the foot by a groove ; mouth in the form of a short proboscis. 



356. S. tentaculatus. — Tentacula produced^ filiform ; the 

 foot pointed behind. 



Lamellaria tentaculata, Mmt. Linn. Trans, xi. 186. t. xii. f. 5, 6 Coast 



of Devon. 



Shell more depressed and opake than the preceding. Animal suborbicular, 

 depressed, convex above, yellowish, with sulphur coloured and black spots ; 

 foot ovate, broad ; the breadth about three quarters of an inch. 



