QO'i^GRYLlA—DITHYRA. 38. 167 



Shell about half an inch long, and rather more in breadth, of a 

 pale rufous color with darker oblique bands, rounded at one end and 

 somewhat angular at the other, strongly striate longitudinally and 

 crossed with finer lines : beaks near one end, very remote from each 

 other, incurved, with a broad smooth space between them ; the up- 

 per margin sinuous and gaping in the middle ; inside whitish or 

 tinged with chocolate-brown. 



Arca testa oblongd decussatd, antic^ angulatd, margine supero trans- f^^^^ 

 versim breviori recto subclauso. -■ 



Shell oblong decussate, angular at the anterior side, with the upper 

 margin shorter straight and nearly closed. 



Donovan, v. tab. 158, fig. 3, 4. 

 Montagu, Suppl, p. 51, tab. 4, fig. 3. 

 Pennant, Brit. Zool. iv. p. 215. 

 Turton, Conch. Diet. p. 10, 

 Arca imbricata. Dillwyn, Descript. Catal. p. 226. 

 Area Nose, Var. Chemnitx, vii. p. 183, tab. 54, fig. 532. 

 Balanus Bellonii. Lister, Conch, tab. 367, fig. 207. 

 Western coasts. 



Shell resembling the last species, but is narrower in proportion to 

 its length, in consequence of the upper angle being shorter than 

 the lower ; it is also more convex, with finer decussations, and the 

 margin is nearly straight : the beaks are very remote, and it wants 

 the oblique zigzag bands 



Arca testd rhombed granuloso-decussatd, costd obliqud longitudinali, tetragona. 



margine hiante. 



3. 



