WORMS. TESTACEA. 35. Pholas. 145 



more pointed, the hides of the dorfal-one compressed and brought 

 to a line carinate edge down the middle. 



167. h.fascicularis. With 5 valves, striate; dorsal valve 

 much spread out and forming a sharp prominent an- 

 gle at the base. 



Ellis. Zooph. p., 197. t. 15./. 6. Donovan t. 164. 



Shell with the upper-valves poinded and turning back at the tip, 

 a little convex in front; the dorfal-valve dilated at the bafc into 

 an acute angle. 



163. L. sulcata. With 5 valves, strongly nhbed ; dorsal- 

 valve, somewhat compressed, longitudinally striate, 

 with a smooth slightly cariuate edge. 



Montague Brit. Shells. p. 17. tab. x.fig. 6. 



Shell about a quarter of an inch long, dirty white, nearly trian- 

 gular : lower-valves with 15 strong ribs; upper-ones pointed at 

 top, narrowing to a point downwards, with 7 or 8 ribs and fmaller 

 intei mediate-ones : peduncle short, dusky. 



169. L. S'calpellum. With 13 valves, rough i sh ; dorsal- 

 valve compressed, running into a sharp process about 

 half way up. 



Montague p. 18. t. \.f. 4. Donovan Shells, f. 166./. 1. 



Shell 6 lines long, light brown, not striate, covered with short 

 hairs, much comprefsed, obliquely truncate at top: valves re- 

 fembling fcaies, 6 each side ; dorfal-one rounded at the edge at the 

 bafe : peduncle very short, annulate, hairy. 



35. PHOLAS. 

 110. Ph. Dactylus. Oblong, rough, with reticulate muri- 

 cate strias on the anterior end : hinge reflected form- 

 ing several cells at the back. 



Br. Zool. t. 39./. 10. Donovan Shells t. 118. 



Shell more than an inch long, above 3 broad, white, thin, brittle, a 

 little reticulate, ending in a beak forming a large gape, with 4 ac- 

 cessory valves. 



HI. "Ph. parva. Ovate, rough, reticulate, muricate at 

 the anterior end : hinge reflected, without cells . 



Br. Zool.t. 40./. 13. Montague Shells t. \.f. 7. 8. 



Shell half an inch long, an inch broad, ending in a kind of beak 

 at the larger end, with a single plate at the back but none below 

 the hinge : teeth slender, curved, with a knob at the bafe. 



H2. Ph. crispata. Somewhat oval, reticulate on the an- 

 terior half and separated from the plain half by a 

 broad furrow down the middle. 



Br. Zool iv. t. 40./. 12. Dcnov. t. 62. 69. 



Shell nearly 2 inches long, 3 broad, gibbous, whitish, obtufe, very 

 open at both ends, striate tranfverfely : hinge reflected, fmooth : 

 teeth long, curved, without the knob at the bafe. 



173. Ph. Candida. Oblong, muricate on all parts with de- 

 cussate striae : one valve with an additional tooth- 

 like process. 



Br. Zool. iv. t. 39./. 11. Ddnovan Shells t. 132. 



Shell near an inch long, an inch and a half broad, thin, brittle, 

 whitish, slightly muricate at the larger end, with an accessory- 

 valve at the hinge : hinge reflected, fmooth : teeth slender, incurved, 

 with an erect procefs in one valve on the margin above the 



