24 
valves whieh are either smooth or nearly so, very thin 
and light, horn-colored, the two upper valves ending in 
a point above the dorsal and somewhat bending back at 
the apices ; dorsal valve dilated at the base and forming 
a prominent acute angle, terminating the carinated 
upper portion: pedicle generally very short. 1. Rare, 
Devon, near Milton. 
Genus POLLICIPES. 
Shell consisting of five principal elongated trapez 
form pieces, surrounded with a number of smaller 
ones similarly shaped, all sharp pointed at the 
apex and forming together an irregular laterally 
compressed cone, supported on a thick scaly coria- 
ceous peduncle. 
P. Scatpeutum. Lam.—Lepas 8S. Lin. 1109.— 
Gualt. t.106. f. C. ?—Muller. Zool. D.3. t. 94. f. 
1, 2.—#. t. 166. f. 7.—Dor..Cat. p. 26. t. 2. f. &. 
—Don. t. 166. f. 1.—Turt. D.p. 74.—D. p- 30.— 
Mont. p. 18. t. 1. f. 3.—Wood. G. f. p. 61. €. 10. 
f. 3.—ScaLPELLuM VuLGARE. Leach.—Reeve. t. 
13.—Much compressed, the sides nearly parallel to 
each other for about half the length from the base, light 
brown, dull, rather rough, without any strie, faintly 
wrinkled in some parts and covered with short hairs; 
