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 Jive principal elongated trapezi 

 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. SCALPELLUM. Lam. LEPAS S. Lin. 1109. 

 Gualt. 1. 106. /. C. ? Muller. Zool. D. 3. t. 94. / 

 1,2. J^. t. 166./. 7. Dor. Cat. p. 26. t. 2. /. 8. 

 Don. t. 166./. l.Turt. D.p. 74. D. p. 30. 

 Mont. p. 18. t. 1. /. 3. Wood. G. f. p. 61. t. 10. 

 /. 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 striae, faintly 

 wrinkled in some parts and covered with short hairs; 



