3056 PATELLA. 



cius. Ferroe Islands and Iceland. Chemnitz. England. 

 Montagu. 

 Shell about three lines long, rather more than two broad, and 

 one and a half high, white, with strong longitndinal tuber- 

 culated ribs, and somewhat wrinkled transversely ; it has a 

 fissure or perforation, extending longitudinally from the re- 

 curved summit towards the anterior margin, and appears to 

 be a link which connects the Emarginulae and the Fissurellae 

 of Lamarck. 



pusTULA. 91. Shell oval, flattish, with radiated ribs, 

 and sub-truncated at one end ; margin thick 

 and crenated. 



Patella Pustula. Linnaus Syst. Nat. p. 1262.? Schroeter 



Ein(. ii. p. 436. t. 5. f. 8. ? Chemnitz, x. p. 338. t. l6S. 



f. 1632 and 1633. Gmelin, p. 3728. Schreibers Conch. 



i. p. 362. 



Patella Unguis. Martini Besch. Berl. Naturf. ii. t. 12. f. 4 



and 5. 

 Patella, No. 157. Schroeter Einl. ii. p. 508. 

 Lister Conch, t. 528. f. 3. Petiver Gaz. t. 3. f. 12. Hum- 

 phreys Conch, t. 7. f. 12. 

 Inhabits the Mediterranean. LinncEus. Jamaica. Shane. 



West India Islands. Chemnitz. 

 Linnaeus has given of P. Pustula the following specific charac- 

 ter : *' Shell oval, gibbous-convex, with reticulated striae, 

 and a crenated margin ;" to this he has added a remark that 

 it is very like P. Fissura, and has quoted the above-men* 

 tioned figure of Petiver's, which is the shell now described, 

 and also Klein Ost. t. 8. f. 3, which is P. Grccca ; so that 

 with such contradictions the Linnaean P. Pustula must al- 

 ways continue a doubtful species. The length is most com- 

 monly about ten, and the breadth eight lines, and the shell is 

 shaped somewhat like a finger-nail, but a Variety is less 

 truncated, and measured ten by only seven lines ; the outer 

 surface is of a dull white, sometimes variegated with dark 

 red in irregular blotches, and the inside is white and glossy ; 

 the perforation is placed nearer to the truncated than to the 

 other end, and excepting a small smooth space which sur- 

 rounds the perforation, the surface is longitudinally ribbed 

 and slightly striated transversely, Favanne has erroneously 

 described this shell for a Variety of P. Scutelium. 



GR-ECA. 92. Shell ovate, cancellated, with the sum- 

 mit somewhat lateral, and the inner margin 

 crenated. 



