150 WORMS. TESTACEA. 38. Tclliiia. 



SW/ half an inch long, 3 quarters broad, yellowish radiate with 

 red, obfcurelv striate : beak fmall, nearer to one end : teeth in one 

 valve Q, that behind the beak extending into a lateral lamina. 



203. T. tenuis. Sub-oval, Hat, thin, glossy, slightly stri- 

 ate, somewhat pointed at the anterior a\d : hinge with 

 a lateral laminate tooth in one valve. 



Donov.t. 19./. ?. Br. Zoo/, t. 48./. 29. T. planara. 



She/thaU an inch long. 3 quarters broad, femipellucid, brittle, 

 whitish, yellow, or red, with a few concentric striae and lighter 

 bands ; beak fmall, nearly central. 



204. T. striata, Suhoval, Hat, thin, semipellucid, finely 

 striate, rosy white : hinge with a lateral laminate 

 tooth in both valves. 



Chemn. Conch. 6. t. 12./. 117. Montague. Brit. Shells, p. 6c. 



Shell an inch long, 6 lines broad, rofy-white, within rofy white 

 round the margin, indented at the slope : beak fmall, pointed, 

 nearly central: differs from T. tenuis in its regular tranfverfe 

 striae, and its thick lateral teeth. 



205. T. Fabula. Oval, compressed, a little produced at one 

 end, one valve obliquely striate longitudinally, the 

 other smooth : beak turning a little to one side. 



Donovan, t. 97. Montague p. 61. n. 7. 



Shell 6 lines long, an inch broad, bluish-white or yellow, thin, 

 pellucid, rounded at one end, produced to a point at the other, 

 contracted at the margin near the fmaller end : beak fmall, nearly 

 central, pointed, turned a little to one side : hinge with 3 teeth in 

 one valve and 2 in the other. 



206. T. similis. Oval, compressed, rounded at both ends, 

 both valves obliquely striate longitudinally five-sixths 

 of their surfaces : beak not curved. 



Soxverby Brit. Miscell. ii. tab. 75. 



Shell refembling the last, except in having both valves diagonally 

 striate over nearly the whole furface, in not being produced to a 

 point at the fmaller end and not contracted near it, and in having 

 the beak straight. 



207. T. solidula. Suborbicular, a little convex, produced 

 at one end ; hinge with 2 small teeth in each valve. 



Br. Zool. tab. 49./. 32. Da Costa t. 12./. 4. Montag.p. 63. 



Shell 3 quarters of an inch long, rather more broad, strong, white 

 or red, with often intermediate shades, often variegated with con- 

 centric red yellow or whitish bands: within glabrous, red, white, or 

 yellow : beak nearly central. 



208. T. fausta. Suborbicular, rather compressed, semi- 

 pellucid, tinely striate : hinge with strong lateral 

 teeth, the primary one in each valve cloven. 



Donovan tab. 98. Linn. Trans, viii. t. \.f. 8. 



Shell 3 inches long, a little more broad, white, with a bend at the 

 posterior margin : beak fmall, nearly central, not turning to 

 one side. 



209. T. crassa. Suborbicular, flat on the upper-valve, 

 strong, thick, closely striate : hinge with 2 teeth in 

 each valve, one of which is cloven, and 2 lateral teeth 

 in the deeper valve. 



Br. Zoel. t. 48./. 28. Don&v. t. 103. T. rigida. 



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

 vcith pale pink rays, the lower-valve convex. 



210. T. reticulata. Suborbicular, subdiaphanous, com- 



