WORMS. TESTACEA. 37. Solen. 147 



Brit. Zool. t. 44./. 19. Donovan t. 108. 



Shell not an inch long, shaped like a piftachia nut, with a large 

 oral gape opposite the hinge, concentrically striate, fometimes 

 with yellowish rays, sloping at the anterior end, white within : 

 btak near one end. 



182. M. inequivalvis. Somewhat triangular, strong, white, 

 with the under-valve much larger. 



Montague p. 38. Walk, min. Shells./. 35. Gardium. 



Shell 4 lines wide, thick, opake, tranfverfely striate, often fo - 

 vered with a brown skin ; the upper-valve not half the size of the 

 other and obfcurely striate, the under-valve deep : beak central, 

 very prominent: tooth strong, erect, slightly recurved, without 

 lateral-ones. 



1S3. M. subarbicularis. Nearly orbicular, yellowish-white: 

 in one valve a single tooth locking into a double one 

 in the -other r with a laminate tooth in each valve be- 

 hind the beak. 



Montague British Shells. p>. 39. n. 8, 



Shell 4 lines long, and about 5 broad, fomewhat pellucid, often 

 covered with a brown skin, faintly striate tranfverfely : leak fmal(, 

 pointed, turning to one side : values clofed. 



184. M, dedivis. Oval, thin, brittle, suddenly sloping 

 near the gaping end : valves with each a broad too.th~- 

 like plate projecting inwards. 



Donovan, t. 82. Montague p. 48. n. 9. M. pubefcensv 



Sht/l about 2 inches broad, 1 and a quarter long, whitish, trun- 

 cate at the fmaller end, slightly striate concentrically, one valve, 

 turning up behind the slope and embracing the edge of the 

 other : beak nearly central, turning a little sideways. 



185. M. pr&tenuis. Oval, flat, thin, brittle, a little gap- 

 ing: valves with a single tooth in each, hollowed in 

 the midddle, projecting horizontally inwards, and 

 closing over each other. 



Montague Brit. Shells, tab. 1./. 2. Donovan. 1. 176. 



Shell an inch broad, half as much long, whitish, with a few con- 

 centric striae, not truncate : beak fmali, pointed, turning to one 

 side, nearly central. 



186. M. distorta. Oval, thin, brittle, convex, rugged, 

 distorted : valves with a broad subtriangular tooth 

 in each, hollowed in tiiQ middle, projecting hori- 

 zontally inwards. 



Montague Brit. Shells, p. 42. tab. l.fg. 1. 



Shell an inch broad, nearly as much long, oval more or lefs in- 

 clining to orbicular, white, indented at the margin and variously 

 distorted, not truncate: beak projecting, nearly central, not turn- 

 ing to one side. 



IS7. M. bidentata. Suboval, thin, compressed, smooth : 

 hinge with 2 broad erect laminate teeth in one valve 

 standing obliquely, and none in the other. 



Montague Brit. Shells, p. 44. 



Shell the eighth of an inch long, rather more broad, dirty white 

 without striae : beak fmall, near one end, a little reclined : teeth ra- 

 ther distant from each other, with a fmall hollow between them. 



37. SOLEN. Razor-sheath. 

 188. S. Siliqua. Linear, straight: hinge with a single 



N 2 • * 



