230 
and size, some being proportionably longer than others 
(the larger and more orbicularly shaped variety has 
sometimes five, one of which is extremely small and 
linear) these subvolutions defined by a depression and 
wrinkled transversely ; aperture compressed, semilunar. 
0,10. Common on all sandy shores. 
V. Susrotunpum. Mont. p. 522. ¢. 14.f. 9.— 
Flem. Wern. Mem. 4. p. 565. t. 15. f. 4.—F. p. 233 
—Macg. Ab. p. 36.—SeErputa. 8.Turt. D. p. 159. 
Suborbicular, subcompressed, smooth, glossy, opaque 
white, composed of three compartments, the middle one 
elevated above the rest on the upper side, not visible 
beneath: aperture small, angulated: margin in live 
shells yellow. 0,4. Not so common as the last. 
V. BrcornE. Mont. p. 519.—F. p. 234.—SERPULA 
B.Watk. t..1. f. 2.—Turt D. p. 156.— Adams. t.14. 
jf. 2.—Chambers three, the middle cre small, raised or 
depressed, the last suboval, compressed, striated longi- 
tudinally on the longer side from the aperture : the other 
side smooth: contracted towards the mouth which is 
very small and orbicular. Sandwich and Reculver. 
0 ,08. 
V. Optoneum. Mont. p. 522.—Flem: Wern, Mem. 
