id4 
Genus.—FISSURELLA. 
Shield-shaped or depressed conical; concave within ; 
the vertex with an oblong or ovate perforation, 
destitute of a spire. 
F. Grea. (of British authors not Lamarc)—F.p. 
364.—PATELLA G. Pen. 4. p. 144. ¢. 89. fi 153.— 
D. p. 1056.—P. Reticurata. Don. t. 21. fi 3.— 
Elliptic, white, greenish, brownish or white with green 
rays, with strong narrow unequal radiating ribs, decus- 
sated by raised concentric coarse wrinkles; perforation 
simple, more or less oblong, apex truncated; inside 
white or rayed with brown; the margin waved and 
erenulated ; young (I. Apertura. Ff. p. 364,— 
PaTetua A. Mont. p. 491. ¢. 13. f. 10.) with a re- 
flected subspiral apex. 0,43....1. Common on the 
Kentish Coast. 
F. Noacutna. Sow. Conch. Il. f. 15.—Desh. in 
Lam. t.7. p. 604.—Paterta N. Ch. f. 1927,8.—D. 
p. 1055.—P. Fissuretia. Mull. Z. Dan. t. 24. f. 4, 
5.6.—Crmoria. Fuemineii. Leach. Brit. Shells, t. 
10. f. 4,5.—PunctTurE ia: Lowe. Z. J. 3. p. 78.— 
Patelliform, conical, whitish, with strong longitudinal 
ribs; the vertex intorted, a canal becoming broader asit 
descends runs from the apex and terminates in a per- 
foration ; perforation oblique, produced within as a 
short vaulted canal. 3. <drgyleshire, very rare. 
