90 



CONCH OLOGY. 



Bivalves, from the genus Tellina, and inserted them among the 

 v ~"~ r~~' Cardia. The T. inequivalvis forms another new genus 



termed Pandora. 

 Fenocnsis, i Ferroensis. Shell flat, oblong, oval, transversely 

 striated ; "beak very small, nearly central; hinge fur- 

 nished with two teeth in each valve ; from the beak an 

 oblique elevated ridge runs to one end ; length three 

 quarters of an inch, breadth an inch and a halt*. 

 Brit. Zool. tab. 4-7, fig. SI. T. incarnata. 

 Brit. Shells, tab. 6*0. T. trifasciata. 

 Common on the shores of Britain from Cornwall to 

 Zetland. 

 Squalida, 2. Squalida. Shell thin, flat, sub-oval, faintly stri- 



ated concentrically, the anterior end running into a 

 beak ; hinge with two teeth in one valve and three in 

 the other, one of which is a little remote; the small end 

 of one valve reflects a little outwards, and forms a de- 

 pression on the surface, the other turns inwards to cor- 

 respond ; length an inch, breadth three quarters. 

 Pult. Hutch. Dor. tab. 5. fig. 2. 

 Brit Shells, tab. 63. T. Depressa. 

 Fust noticed as British by Dr Pulteney, who found 

 it near Poole, and at Weymouth, Dorsetshire ; Mr Mon- 

 tagu has found it in Cornwall and Devon; Mr Dono- 

 van in Pembroke ; and Mr Laskey at Dunbar. 

 1 ^ta, 3. Bala. Shell ovate, oblong, flat, and moderately 



strong, marked with regular concentric striae ; beak 

 small, pointed, nearly central ; hinge furnished with 

 three teeth, the outer one on the anterior side bifid, the 

 other exterior one broad ; in each valve one remote la- 

 teral lamina ; length three quarters of an inch, breadth 

 an inch and three-eighths. 



Brit. Shells, tab. 23. T. insequistriata. 

 On the English shores rare. Found at Dunbar by 

 Mr Laskey. 

 Eouacina, 4_ Donacina. Shell thin, sub-oval, compressed, se- 

 mi-pellucid, faintly marked with yellowish concentric 

 striae, and radiated with red ; beak small, and placed 

 near to one end; the cartilage end short and sub-trun- 

 cated ; the hinge is furnished with two teeth in one 

 valve, and a single tooth in the other; length about 

 half an inch, breadth three quarters. 



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

 Found on several parts of the English coast, and in 

 Scotland at Dunbar. 

 Tenufc* 5. Tenuis. Shell thin, brittle, flat, sub-pellucid, sub- 



oval, with a few concentric wrinkles ; beak small, pla- 

 ced nearly central ; cartilage end somewhat pointed ; 

 variously coloured ; length half an- inch, breadth three 

 quarters. 



Brit. Zool. tab. 48, fig. 49. T. planata. 

 Brit. Shells, tab. 19, fig. 2. 

 Common on all the sandy shores of Britain. 

 Striata, 6. Striata. Shell sub-oval, flat, thin, sub-pellucid, of 



a rosy white colour, darkest towards the beaks, marked 

 with fine concentric striae ; beaks small, pointed, not 

 quite central; cartilage slope indented; primary teeth 

 two, with strong remote laminated ones on each side; 

 length one inch, breadth five-eighths of an inch. 

 Test. Brit. tab. 27, fig. 2. 

 Found by Mr Bryer on the beach between Wey- 

 mouth and Portland. 

 -Fabula, 7. Fabula. Shell thin, pellucid, compressed, oval, 



white ; beaks nearly central, small, pointed, and turn- 

 ing a little to one side ; anterior side slopes to an ob- 

 tuse point ; the opposite end is much larger and round- 

 ed ; left valve finely striated in a diagonal direction ; 

 hinge with three teeth in one valve, and two in the 

 other; length five-eighths of an inch, breadth an inch. 

 Brit. Shells, tab. 97. 



Not uncommon on sandy shores. Bivalves. 



8. Similis. Shell ovate, compressed, with both valves s y~~~ r ~ mm ' 

 diagonally striated five sixths over the surface ; beaks Sim "' s s 

 not curved; breadth about half an inch. 



Brit. Misccl. page 29, tab. 75. 

 First described by Mr Sowerby. It inhabits the 

 shores of Brighton, in company with T. fabula. 



9. Solidida. Shell strong, convex sub-orbicular; co- Solidula, 

 lour various ; beaks near the middle ; hinge with two 



small teeth in each valve ; length three quarter? of an 

 inch, breadth rather more. 



Brit. "Zool. tab. 49, fig. 32. T. carnaria. 

 A common littoral shell. It is often found at the 

 mouths of large rivers, but not beyond the influ- 

 ence of the tide. Thus it occurs in the Tay as far up 

 as Flisk. 



10. Fausta. Shell sub-orbicular, somewhat compres- Fausta^ 

 sed, white, with numerous fine concentric stria?; at the 

 posterior end a fissure from the beak to the margin ; 



beak central; hinge furnished with strong lateral teeth; 

 one of the primary teeth in each valve bifid ; diameter 

 an inch and three quarters. 



Lin. Trans, vol. viii. tab. 1, fig. 8. 



Brit. Shells, tab. 98. 

 Found in Dorsetshire by Dr Pulteney, in Devonshire 

 by Mr Montagu, and in Pembrokeshire by Mr Donovan. 



1 1 . Crassa. Shell strong, thick, sub-orbicular, with Crassa, 

 fine close set concentric striae, interrupted by a few 

 courser ridges ; left valve convex, the other more com- 

 pressed; beak placed a little to one side; hinge 



with two teeth in each valve, one of which is bifid ; in 

 the left valve two lateral teeth, one more remote than 

 the other. 



Brit. Zool. tab. 48, fig. 28. 

 Brit. Shells, tab. 103. T. rigida. 



Found on the soutli coast of England ; and at Aber- 

 lady bay by Mr Laskey. 



12. Prqficua. Shell sub-orbicular, sub-diaphanous, Proficua, 

 beset with numerous fine regular elevated ridges, the 

 furrows crossed with minute striae ; beak small, promi- 

 nent, nearly central ; hinge, with two small central 



teeth, and broad laminated lateral ones projecting above 

 the margin; inside smooth, glossy, yellow, margin 

 plain, beneath which is a punctured line ; length an 

 inch and a quarter, breadth somewhat more. 

 Lin. Trans, vol. viii. tab. 1, fig. 9. 

 First described as British by Dr Pulteney, who found 

 it at the north shore at Poole, and at Weymouth, Dor- 

 setshire. 



13. Radula. Shell convex, sub-orbicular, white, be- Radula, 

 set with numerous fine sharp-edged concentric striae ; 



beak central, small, the apex turned to one side ; hinge 

 with two small teeth in each valve, standing a little 

 oblique ; breadth about an inch and a half, and nearly 

 the same in length. 



Brit. Shells, tab. 130. T. Venus Borealis. . 

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

 On the south coast of England, not common. In 

 Scotland, frequent at Leith, Arran, and Zetland. 



14. Bimaculata. Shell roundish, sub-triangular, faint- Bimaculata, 

 ly striated transversely ; beak nearly central, the apex 



turned a little to one side ; primary teeth large, lateral 

 ones strong, remote ; length half an inch, breadth five- 

 eighths. 



Brit. Shells, tab. 19, fig. 1.1. 

 First noticed by Da Costa from the coasts of Hamp- 

 shire and Lancashire. Dr Pulteny and Mr Bryer pro- 

 cured it at Weymouth. 



15. Lactea. Shell thin, orbicular, convex, with fine L a aea 

 concentric irregular wrinkles; beaks small, central, turn- 



