wo 
Na) 
bling the last species but is strongly striated radiatingly, 
the lower valve from the lower anterior angle and the 
superior one irom the upper posterior angle, these are 
crost by fine strize; the angles of the valves are much 
more sharp and pointed and particularly the apex; the 
dorsal valve is compressed at the sides and brought to 
a fine carinated edge; bluish white; membrane and 
peduncle orange red. Drifted wood, Devon, rare, 1. 1%. 
A. Sutcata.—Lepas 8. Mont. p. 17.t. 1. f. 6. 
—Inn. T. 8. p.29.— Dor. Cat. p. 26.—Turt. D. p. 72. 
—Wood. G. C. p. 68. ¢.12. f. 1.—D. p. 31.—Com- 
pressed, subtriangular, dirty yellowish white, shorter 
than the last; lower valves with fifteen strong ribs 
diverging trom the lower anterior angle, that which runs 
along the front is larger than the rest and forms a mar- 
gin, the two superior valves form a pointed apex and 
narrow downwards to a point; furnished with seven or 
eight ribs, with smaller intermediate ones diverging 
from the posterior margin; dorsal valve somewhat 
compressed, with a smooth subcarinated edge; pedicle 
short and dusky. 43. 4. Dorset, rare. 
A. FascicuLaris.—Lepas Ff’. Ellis, Zoop, t. 15. f. 
6.—Mont. p. 557. and Sup. p. 5. and p. 163.— 
Lin. T. 8. p. 30.—Turt. D .p.72.—Wood. G. C. p. 
62. ¢. 10. f. 4.—D. p. 31.—Lepas Dinatata. Don. 
t. 104.—A. Vitrea. Lam. 5.—Compressed, with five 
