YTORMS. TESTACEA. 40. Mactra. 155 



finely striate, with a few coarser wrinkles, gaping a 

 litflc at the smaller end. 



Montague Brit. Shells, p. 95. tab. ./. i. 



Shell an inch long, an inch and a half broad, a little produced at 

 one end, with a sharp plain margin: beak rather oblique; middle- 

 tooth in one valve broad, forked, angular, clofc to the beak. 



24j. M. comprcssa. Suboval, snbtriangular, thin, flaf, 

 semi pellucid, irregularly wrinkled : in one valve a 

 single tooth locking into a cloven one in the other. 



Donovan t. 64, f. i. Tellina plana. Da Cost. t. 13. f-, i. 



Shell an inch and a half long, 2 broad, yellowish-white, or pale 

 ferruginous, often with dark bands: beak fmall, central: hinge 

 without 4atcral teeth : cavity at the cartilage large, triangular. 



244. Mr Bo'ym. Oval, flat, thin, pellucid, glossy-white, 

 nearly smooth : beak oblique, a little turned. 



Montague, t. %.f. 7. Linn, Trans, \\\t, i6.f. 9-12. 



Slietl half an inch long, 3 quarters broad, with fometimes a few 

 obfcure striae : teeth one in each valve, with a broad lateral tootli 

 in one valve only : cartilage thin, long. 



245. M. tnangularis Subtriangular, opake, white, 

 smooth: hinge with a large cloven tooth in one valve, 

 in the other two small ones with a triangular cavity 

 between theirt. 



Montague Brit. Shdls. p. 99. tab. 3.7. 5. 



Shelly lines broad, 2 long, a little produced on one side, strongly 

 crenate on the margin within. 



240. M. lutraria. Oblong-oval, nearly smooth: hinge 

 without lateral teeth, in one valve a small and large 

 triangular cavity, in the other a cavity and raised tri- 

 angular tooth. 



Br. Zool. t. 52. /. 44. Donovan t. 58. Linn, Tr. \\. t. i6.f. 3. 4. 



Shell above 2 inches long, 4 broad, yellowish-white with pale 

 bands, fometimes with a few striae, gaping a little at both ends, 

 glossy-white within : beak fmall, nearer the larger end. 



24T. M. glanca. Oval, finely striatc, wrinkled at the an- 

 terior end, dirty-white, with broad and narrow brown- 

 ish or glaucous rays. 



Donovan Brit, Shells t. 125. Cfiemn. vi. t, 23. /. 232, 233. 



SMI 2 inches and a half long, 3 and a half broad : beaks turned 

 backward, with a narrow gape between them. 



248. M. ttnuis. Subtriangular, equilateral, thin, semi- 

 pellucid, white, wrinkled : hinge with a forked tooth 

 in one valve and a simple one in the other, with late- 

 ral teeth in each. 



Montague, Brit. Shells, app. p. 572. 



Shett a quarter of an inch long, rather more broad : beak fmall, 

 central, produced, straight. 



249. M. Mans. Oblong, strong, rugged, gaping at the 

 smaller end, arched under the beak : beak near the 

 larger end. 



Donovan t. 140. Linn, trans, vi. f. 16.7.5. ^. 



Shell 2 inches and a quarter long, 5 broad, opakc, dark-brown or 

 grey with often a rufous tinge, very rugged near the open end : 

 hinge with a flattish tooth, grooved on the fore-part, locking be- 

 tween two in the other valve, one of which is cloven. 



