6(5 



CONCHOLOGY. 



'univalves. 14., Militaris. Shell subcorneal, decussated with fine 

 '--"^— — • stria' ; vertex recurved, and turned to one side ; mouth 

 circular, about half an inch wide, inside glossy, white. 

 Test. Brit. tab. 13, fig. 11. 

 British Shells, tab. 171. 

 First noticed as British by Dr Pulteney ; found at 

 Weymouth by Mr Bryer; in Cornwall by Miss Pocock; 

 and in the Frith of Forth by Mr Laskey. 



D. Oval, subcorneal, with a perforated summit. Fis- 

 surella. 



GriEC?, 15. Grazca. Shell oblong, oval, thick, of a brown co- 



lour, strongly reticulated ; vertex truncated, with an ob- 

 long perforation, margin somewhat indented or arcua- 

 ted ; length about three quarters of an inch, breadth 

 half an inch, height a quarter. 



Brit. Zool. tab. 89, fig. 153. 

 Pult. Dorset, tab. 23, fig. 3. 

 Brit. Shells, tab. 21, fig. S3. 

 Not uncommon on the English coast. 

 Apertura, jg Apertura. Shell subconical, white, marked with 

 strong tuberculated ribs, with a few circular ridges ; 

 vertex reflected, small, turning downwards, above which 

 is a rhomboidal perforation ; mouth oval, margin crenated ; 

 length about a quarter of an inch, height one-eighth. 

 Test. Brit. tab. 13, fig. 10. 

 Found by Mr Montagu at Falmouth and in Salcomb 

 bay. We have observed it in Zetland. 

 Zetlandic?, 17. Zetlandica. Shell white, pellucid, glossy, oblong, 

 furrowed from the vertex to the margin with tubercula- 

 ted ribs ; vertex obtuse, marginal, with an oval per- 

 foration; mouth ovate, margin waved; length scarcely a 

 line. 



This new species was observed among small shells 

 from Zetland. 

 Marginal, 18. Marginata. Shell white, pellucid, glossy, smooth, 

 oblong ; margin waved ; vertex pointed, marginal, with 

 an oval perforation, surrounded with a raised border ; 

 length about half a line. 



Found with the preceding species in Zetland. 



E. Posterior margin furnished with a slit, summit en- 

 tire. Emarginula. 



Fi^ura, 19. Fisiura. Shell oval, conical, striated, reticulated '> 



vertex a little reflected ; mouth oval, margin crenated, 

 with a slit behind reaching about one-fourth of the 

 length of the shell towards the vertex, inside smooth, 

 glossy ; length half an inch, height and breadth about 

 two-eighths. 



Brit. Zool, tab. QO. Fig. 152. 

 Brit. Shells, tab. 3. fig. 3. 

 In England and Scotland not frequent. 



F. Conical, cavity furnished with a thin plate, or 

 tooth-like process. Calyptrcea. 



Climensis. 2 0. Chinemis. Shell entire, subconical, of a pale 

 brown or whitish colour ; vertex central, slightly wrink- 

 led concentrically; mouth circular, inside glossy, smooth, 

 furnished with a flat thin plate, standing obliquely to 

 the side of the shell; breadth five-eighths, height two- 

 eighths. 



Brit. Shells, tab. 129. 

 Test. Brit. tab. 13. fig. 44. 

 First noticed as British, by Col. George at Penryn. 

 It has since been found at Salcomb bay by Mr Monta- 

 gu, and in the Frith of Forth by Mr Laskey. 



Genus II. Hauotis. 

 II. Hamo- 

 tii. Shell ear-shaped, fiat, spire lateral, andnearly conceal- 



ed; disk pierced with holes, in a line parallel with the Univalves. 

 inner margin ,• mouth wide, longer than its breadth. —""V""' 



1 . Tuberculata. Lin. Shell strong, opake, oval, stri- Tubercula- 

 ated longitudinally, and Avrinkled transversely; near ta « 

 the inner margin, a ridge beset with tubercles, increa- 

 sing in size to the front, where a few of them are per- 

 vious ; inside pearlacious ; length 4 inches, breadth 3 

 inches. 



Brit. Zool. tab. 88, fig. 141.. 

 Pult. Hilt. Dorset, tab. 22. fig. 1. 1. 

 Don. Brit. Shells, tab. 5. 

 Adheres to rocks ; found after storms on the western- 

 and southern coasts of England ; common in Guernsey, 

 where the animal is used for food. 



Genus III. Sigaretus. 



Shell ear-shaped, with an obsolete spire, aperture in. Sia- 

 large, inner margin turned inwards ; disk without orifices, retus. 



1 . Haliotovtea. Shell thin, pellucid, white, glossy, Haiiotoi- 

 finely wrinkled across ; aperture oval, nearly extended dea - 

 to the apex ; inner margin turned inwards, outer mar- 

 gin thin, membranaceous ; apex small, and making 

 nearly two volutions ; length tlnee-fourths, breadth half 

 an inch. 



Lin. Sysl. Nat. p. 1250, No. 713. Helix haliotoidea. 

 Mont. Test Brit. tab. 7, fig. 6. Bulla haliotoidea. 

 Pult. Hutch. Dor. tab. 22, fig. 5.* 



On the coast of Devon and Dorset, by Mr Montagu ; 

 at Weymouth, by Mr Bryer ; at Portobello sands, Scot- 

 land, by Mr Laskey ; and we have found it in Zetland. 



This shell was placed by Linnaeus in the genus Helix, 

 in the family Ovatse imperforatae. By Montagu, and the 

 authors of the Descriptive Catalogue, it is placed among 

 the Bulla?. Its form points out at once its relation to 

 the preceding genus, with which it would have been 

 united by Linnseus, had it possessed the row of tuber- 

 cles on the disk. Its shape and inflated margin forbid 

 its insertion either in the genus Bulla or Helix Its 

 animal completely envelopes the shell. The present 

 genus was formed by Lamarck, who places it among 

 the naked mollusca, in company with the dorris and 

 chiton. 



Family II. TUBULAR. 



This family of shells was first pointed out by Langius, 

 under the title Tubuli murini. Their form is that of a 

 narrow tube, usually sub-cylindrical, or tapering to a 

 point. The family contains three genera, Denlalium, 

 Ccecum, and Serpula. 



Genus IV. Dentalium. 



Shell tubular, nearly straight, tapering; apex pervious. 1Vi Dkn . 



1. Entalis. Shell subarcuated, tapering to a small TilIUM - 

 point, often marked with circular wrinkles and bands, Kn - alis - 

 colour white ; length half an inch, diameter at the lar- 

 gest end about two-tenths. 



Brit. Zool. tab. 90, fig. 154. 

 Don. B. Shelh, tab. 48. 

 Not uncommon in England and Scotland. It ap- 

 pears to be an inhabitant of deep water. 



2. Dentoli , Lin. Shell tapering, subarcuated, very Dewalis, 

 small at the point ; striated longitudinally ; striae about 



20 in number ; length half an inch. 



Test. Brit. p. 435. D. Striatum. 

 Found on the shores of Cornwall and Devon by Mr 

 Montagu. 



