CONCHOLOG Y. 



S3 



on the outer lip, angulated at bottom, with a toothlike 

 protuberance ; pillar lip smooth, white ; diameter about 

 an inch. 



Brit. Shells, tab. 71. T. linealus. 

 Frequent on the English coast. Mr Laskey found it 

 at Dunbar. 



8. Tenuis. Shell thin, fragile, conical, with fine gra- 

 nulated ridges on each whorl ; pillar reflects a little ; 

 diameter an inch and a quarter. 



Brit. Shells, tab. 1 27. T. papillosus. 

 First described by Da Costa, who received it from 

 Cornwall. Dr Pulteney has found it at Poole and Wey- 

 mouth. 



9. Ziziphinus. Shell conic, pointed, with seven or 

 eight whorls, wrought with several spiral ridges ; aper- 

 ture compressed angulated ; inside nacred ; base flattish. 



Brit. Zool. tab. 80. 'fig. 103. 

 Common on the British shores and in Orkney and 

 Zetland. 



10. Exiguus. Shell conic, with six volutions, point- 

 ed; each whorl wrought with four or five small, spiral 

 crenated ridges, with a larger one at the base ; aperture 

 angulated ; inside white ; length three eighths of an 

 inch ; breadth a quarter of an inch. 



Brit. Shells, tab. 8. fig. 2. T. conulus. 

 Not uncommon on the English coast. 



1 1 . Striatus. Shell conic, pointed, with six flat vo- 

 lutions, scarcely defined by any separating line, each 

 wrought with eight or nine spiral ridges, intersected 

 by very small longitudinal striae. 



Brit. Shells, tab. 155, fig. 1. T. conicus. 



Found on the Euglish coast, not frequent. 



The claims of T. ciuereus to admission among Bri- 

 tish shells are too feeble to warrant its insertion in the 

 present list. 



Family III. CONVOLUTED. 



The shells of this family have a lengthened mouth, 

 parallel with the length of the shell. The whorls, 

 which are small segments of large circles, are wrapt 

 round the pillar, and do not rise one above another, but 

 embrace or inclose one another. Three genera are in- 

 cluded, Cyprea, Valuta, and Bulla. 



XIX. 

 Oyprj;a. 



EuropM, 



smooth, glossy, with the outer lip white; extreme vo- Univalves. 

 lutions two, very small ; mouth linear, terminated by a """*~V "— 

 groove ; both lips denticulated, the inner one faintly ; 

 pillar subplicated ; length about half an inch. 

 Test. Brit. tab. 6, fig. 77. 

 Found by Mr Montagu in Salcomb Bay, and by Mr 

 Laskey near Dunbar. 



Valuta. 



Genus XIX. Cypr^sa. 



Skell ovate, convex ; margin involuted ; spire small, 

 and nearly covered over ; mouth linear, extending the 

 whole length of Ike shell, and toothed on both sides. 



1. Europaza. Shell oval, glossy, tumid, surrounded 

 transversely with elevated striae, which terminate with- 

 in the lips, giving them a crenated appearance ; colour 

 pale purple, with generally three dark spots on the 

 back ; lips white. 



Brit. Zool. tab. 70, fig. 82. C. pediculus. 



Brit Shells, tab. 43. 

 This species, which is common on our coast, is sub- 

 ject to great variations in different stages of its growth. 

 In its youngest state, it is pellucid white, with three 

 very small volutions; mouth suboval, outer lip atte- 

 nuated, inner lip plain. This is the Bulla diaphana of 

 Test. Bri*. and Valuta Ionensis of Brit. Zool. In an- 

 other stage of its growth, the back is still smooth, the 

 edges of the lips crenated, and the apex a little produ- 

 ced. This has been termed C. bullata. Those species 

 in which the dorsal striae are distinct, but in which the 

 spots are wanting, have been called C. arctica. 



2. Voluta. Shell conoich of a pale greenish colour, 



xx. 



Voluta. 



Genus XX. Voluta. 



Shell ecaudated; mouth extending nearly the ■whole' 

 length of the shell ; pillar twisted or plaited, without an 

 interior lip or perforation. 



1. Tornalilis. Shell with eight spires, the first large, Tornatilis. 

 the others small, pointed, of a pale purplish red, striated 

 spirally, with two white bands on the body whorl; 



mouth long and narrow ; pillar with one fold ; length 

 three quarters of an inch. 



Brit. Zool. tab. 71, fig. 86. 

 On the English and Scottish coasts not uncommon. 



2. Pallida. Shell smooth, glossy, white, cylindrical ; pallida. 

 upper volution small ; apex obtuse ; mouth narrow, 

 spreading a little at the base ; pillar with four folds ; 

 length half an inch ; breadth a quarter. 



Brit. Shells, tab. 66. 

 First noticed by Da Costa, who received it from the 

 western coast. 



3. Denticulata. Shell with seven or eight volutions,. Denticula- 

 pointed, the lower one large ; mouth oblong, oval, half ta, 



the length of the shell ; outer lip furnished with two or 

 three tubercles near the margin ; pillar plaited with 

 three or four folds; length half an inch; breadth a 

 quarter. 



Test. Brit. tab. 20, fig. 5. 

 Found by Mr Montagu in Devonshire, at Weymouth 

 by Mr Bryer, and at Dunbar by Mr Laskey. 



4. Alba. Shell oval, white, with four finely striated ^^a 

 volutions ; mouth long and narrow, with four plications 



on the pillar ; length one-tenth of an inch. 

 Test. Mm. Ra . tab. 3, fig. 6l. 

 From Sandwich and Sheppy island, Mr Walker; 

 and Dunbar, Mr Laskey. 



5. Catenata. Shell oblong, strong, pellucid, white, catenata, 

 glossy, with four bands of opaque, white, oblong spots ; 



upper volution scarcely defined; mouth the whole length 

 of the shell, linear ; outer lip thick ; pillar quadruplica- 

 ted ; length a quarter of an inch ; breadth at the top 

 one-eighth. 



Test. Brit. tab. 6, fig. 2. 

 Found by Mr Swainson in St Austle Bay, near Fowey, 

 Cornwall ; and by Mr Laskey at Dunbar. 



6. Triplicata. Shell ovate, smooth, chesnut brown, Triplicate, 

 with six spires, the first very large ; mouth contracted ; 



pillar triplicated ; spires very flat ; length scarcely half 

 an inch. 



Brit. Shells, tab. 137- 

 Inserted as British, on the authority of a manuscript 

 note of Da Costa's. 



7. Bidentata. Shell strong, thick, pure white, with Bidentata, 

 six or seven moderately smooth and somewhat glossy 

 volutions, wrought with a few distant longitudinal 

 wrinkles ; mouth narrow, contracted at the upper angle ; 



pillar much thickened, and folding back forms a cavi- 

 ty, and is furnished with teeth-like plications ; length 

 a quarter of an inch, 



Test. Brit. tab. 29, fig. 3. 

 Found by Mr Laskey at Dunbar, Haddingtonshire... 



8. Hyalina. Shell pellucid, white, tapering to an Hyaliiw, 

 obtuse point; mouth contracted, base truncated and 



