134 



GENUS. F1SSURELLA. 

 Shield-shaped or depressed conical; concave within ; 



the vertex with an oblong or ovate perforation, 



destitute of a spire, 



F. GR^ICA. (of British authors not Lamarc) P.p. 

 364. PATELLA G. Pen. 4.^. 144. t. 89. /. 153. 

 D.p. 1056. P. RETICULATA, Don. t. 21. /. 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 

 crenulated ; young (F. APERTURA. F. p. 364. 

 PATELLA A. Mont. p. 491. t. 13. /. 10.) with a re- 

 flected subspiral apex. 0,43....!. Common on the 

 Kentish Coast. 



F. NOACHINA. Sow. Conch. II. f. 15. Desk, in 

 Lam. t. 7. p. 604. PATELLA N. Ch. f. 1927,8. D. 

 p. 1055. P. FISSURELLA. Mull. Z. Dan. t. 24. /. 4, 

 5.6. CEMORIA. FLEMINGII. Leach. Brit. Shells, t. 

 10. /. 4,5. PUNCTURELLA. Lowe. Z. J. 3. p. 78. 

 Patelliform, conical, whitish, with strong longitudinal 

 ribs; the vertex intorted, a canal becoming broader as it 

 descends runs from the apex and terminates in a per- 

 foration; perforation oblique, produced within as a 

 short vaulted canal, . Argyllshire, very rare. 



