CONCHOLOGY. 



73 



Univalves, membranaceous ridges ; mouth angulated at the upper 

 s — "V""" part ; length two-tenths of an inch. 

 Test. Brit. tab. 10, fig. 5. 

 Found in Cornwall, Falmouth, and the coast of South 

 Devon. 

 Jugosus, 5. Jugosus. Shell with four spirally ridged whorls, 



the first very large, occupying three-fourths of the shell; 

 outer lip thin, sub-crenated at the edges; pillar lip broad 

 and smooth ; diameter scarcely half an inch. 

 Test. Brit. tab. 20, fig. 2. 

 Lin. Trans, vol. viii. tab. 4, fig. 7- 

 Found by Mr Knight in Dorset, by Mr Gibbs in 

 Cornwall, and by Mr Laskey at Dunbar. 

 Mammilla. 6. Mammillatus. Shell imperforate, subovate, whorls 

 tus, striated with raised dots and slightly angidated by a 



few of these stria, the dots of which are larger. 

 Brit. Shells, tab. 173. 

 Found by Mr Plat on the Scilly rocks, at the west- 

 ern extremity of Cornwall, and communicated by him 

 to Da Costa. 



B. Imperforate, long, tapering. 



Terebra, 7. Tercbra. Shell with about sixteen volutions, ter- 



minating in a very fine point ; larger whorls, some- 

 what rounded, and marked with spiral striae; outer 

 lip thin, fragile and semipellucid ; length about two 

 inches ; breadth at the base, five-eighths. 

 Brit. Zool. tab. 81, fig. 113. 

 Animal yellowish, striped with dusky; tentacula two, 

 short, with the eyes placed at the base. Common. 

 Cinctu', 8. Cinctus. Shell with fourteen raised volutions, se- 



parated by a deep depression, wrought with obsolete 

 spiral striae, with two strong elevated ridges in the mid- 

 dle of each volution, covered with undulated coloured 

 lines ; length two inches and a half; breadth, at the 

 base, five-eighths of an inch. 



Brit. Shells, tab. 22, fig. I. 

 On the English coast, not common. 

 Nitidissi. 9. Nitidissimus. Shell with nine extremely slender, 



mus, smooth, pellucid, white spires, terminating in a'fine point ; 



the volutions are greatly raised and much rounded, and 

 separated by a deep depression; aperture sub-orbicular; 

 inner lip a little reflected ; length one-eighth of an 

 inch. 



Test. Brit. tab. 12, fig. 1. 

 Found at Falmouth harbour by Mr Montagu. 

 Subtrun- 10. Subtruncatus. Shell with seven rounded smooth 



catus, whorls, separated by a deep depressed line ; colour pel- 



lucid yellowish white ; length two tenths of an inch. 

 Test. Brit. tab. 10, fig. 1. 

 Found by Mr Montagu at Southampton and Fal- 

 mouth ; by Mr Laskey at Dunbar. 

 Trunoatus *!• Truncatus. Shell cylindric, smooth, glossy, horn- 

 coloured, with four spires, apex abrupt ; volutions con- 

 siderably raised, aperture slightly emarginated ; length 

 two-tenths of an inch. 



Test. Brit. tab. 10, fig. 7- 

 On the English coast frequent ; has also been taken 

 at Dunbar by Mr Laskey. 



C. Furnished with ridges crossing the whorls. 



Clath 12, ^^thrus. Shell with twelve taper spires, volu- 



' tions rounded, barred the whole length of the shell 

 with from nine to twelve regular distant membranace- 

 ous ribs ; margin of the mouth thickened by a rib that 

 surrounds it ; length an inch and a half; breadth at 

 the base half an inch. 



Brit. Zool. tab. 81. fig. 111. 



VOL* VII. PART U 



Animal with a long tubular proboscis, slender tenta- 

 cula, and a white sustentaculum. On the British shores, 

 not uncommon. 



13. Clathratulus. Shell with six volutions, ribbed 

 across with fifteen ridges; nearly resembles the preced- 

 ing, but is more slender ; length about half an inch. 



Test. Min. Bar. tab. 2. fig. 45. 

 On the British shores. 



14. Unicus. Shell with nine, slender, glossy, pellucid, 

 white spires, terminating in a fine point, longitudinal 

 ridges undulated, transversely striated; length two- 

 tenths of an inch. 



Test. Brit. tab. 12. fig. 2. 

 First noticed at Sandwich by Mr Boys. 



1 5. Parvus. Shell strong, conic, with five or six 

 coarsely ribbed volutions; colour various; outer lip 

 thickened by a rib ; length one eighth of an inch. 



Brit. Shells, tab. 90. 

 On the English and Scottish coasts, not uncommon. 



16. Costatus. Shell strong, white, with four or five 

 whorls; ribs strong, and striated transversely; Up a little 

 expanded; length nearly one-eighth of an inch; breadth 

 one-third of its length. 



Test. Brit. tab. 10. fig. 6. 

 On the English shores not uncommon ; also at Dun- 

 bar. 



17. Striatus. Shell pellucid, glossy, white, with six 

 volutions, somewhat rounded and separated by a well 

 defined line ; upper part of each volution faintly rib- 

 bed, the whole shell regularly striated transversely; 

 mouth marginated ; length one-eighth of an inch. 



Test. Min. Rar. tab. 2, fig. 49. 

 Common on the British shores from Devonshire to 

 Zetland. 



18. Bryereus. Shell conic, glossy, white, with seven 

 smooth spires, finely costated with about eighteen ribs; 

 outer hp strong, pillar lip replicate, smooth. 



Test. Brit. tab. 15, fig. 8. 

 On the English and Scottish coasts, rare. 



19. Coniferus. Shell strong,, taper, white, with six 

 volutions, furnished with about twelve undulated ribs, 

 the interstices between them at the top of each volu- 

 tion are formed into small cavities, transversely striated ; 

 aperture oval, oblique, strongly marginated ; length a 

 quarter of an inch. 



Test. Brit. tab. 15, fig. 2. 

 First observed by Mr Bryer at Weymouth. 



20. Denticulatus. Shell of six volutions, with nine 

 or ten coarse ribs that project at the top of each spire ; 

 mouth suborbicular, outer lip thickened by a rib, pil- 

 lar lip with two small tubercles adjoining the ribs. 



Test. Brit. p. 315. 

 Found with the preceding species, to which it bears 

 a close resemblance. 



21. Decussatvs. Shell glossy white, with five round- 

 ed whorls, well defined by the separating line, strong- 

 ly striated longitudinally, and crossed with extremely 

 fine striae; mouth sub-oval, contracted at the upper part; 

 outer lip thin, inner lip not spreading on the columella; 

 length one-eighth of an inch. 



Test. Brit. tab. 12, fig. 4. 

 Found by Mr Montagu in sand from Salcomb bay. 



22. Reticulalus. Shell strong, conic, opake, with six 

 rounded and much raised whorls, strongly reticulated ; 

 apex pointed; mouth sub-orbicular, margin thick, inner 

 lip spreading on the columella, and forming a groove 

 or sub-umbilicus ; length about one-tenth of an inch. 



Test. Min. Rar. tab. 2. fig. 32. 



K 



Univalves. 



Clathratu- 

 lus, 



Unicu*, 



Parvus, 



Costatus, 



Striatus, 



Bryereus, 



Coniferus, 



Dcnnct^- 



tU6, 



Decmca- 

 tus, 



Reticuk 

 tus, 



