PATELLA-PATINA . 109 



The dentition is said by Dall to be the same as Patella except 

 that the third or outer cusp of the third lateral tooth is obsolete. 



The shell is cap-shaped, scaly-ribbed, the apex strongly curving 

 forward. 

 P. PECTiNATA Born. PI. 51, figs. 1, 2, 3. 



Shell solid, oval, elevated, cap-shaped, the apex curved forivard, 

 nearly to or over the anterior margin. Surface sculptured with 

 numerous close, densely prickle-scaled riblets, alternately larger and 

 smaller. Riblets black, the intervals buff or pinkish. 



Interior of a dull lead color, sometimes a little iridescent at the 

 edge. Length 27, breadth 22, alt. 14 mill. 



Cape of Good Hope. 



Patella pectinata Born, Mus. C?es. Vindob. p. 423, t. 18, f. 7, 

 (1780).— Lam., An. s. Vert, vi, p. 334.— Pot. & Mich., Galerie, i, 

 p. 529, t. 37, f. 11, 12.— Krauss, Die Siidafric Moll. p. 57.— Not 

 Patella pectinata Linn., Syst. Nat. x, p. 783, nor of Gmelin, Syst. 

 xiii, ^ Siphonaria ! — Patella intoria Sowerby, Genera of Shells, 

 Cephala, Patella, f. 5. — Patella pedunculus Gmelin, Syst. xiii, p. 

 3713. — Helcion pectinatus Montf., Conch, Syst. ii, p. 63. — Gray, 

 Guide Syst. Dist. Moll. B. M., p. 126 (descr. of branchife).— Dall, 

 Proc. Acad. N. S. Phila. 1876, p. 244 (dentition). 



This cap-shaped, scale-ridged black species is unlike any other 

 limpet, having much the contour of yS'c«^e^^t?ia. Linnseus is gener- 

 ally but erroneously quoted as the authority for the name. It is a 

 common Cape species. 



Section Patina (Leach) Gray, 1852. 



Patina Leach, Moll. Gt. Brit. (Gray's edition) p. 223, 1852.— 

 Gray, Syn. Br. Mus. 1840 (name only no definition ; no type 

 mentioned).^ J.??sa^es SowB., Conch. Man. edit, ii, p. 68. — Helcion, 

 Patella and Nacella sp., of authors. 



The branchial cordon is interrupted in front ; side of the foot with- 

 out an epipodial ridge or papillae. 



Dentition, pi. 52, fig. 2. Tavo inner lateral teeth on each side an- 

 terior, having simple cusps, the third lateral having a broad tri- 

 partite cusp. Formula of dentition ■i{x'^'W 



Epipodial papillae have been ascribed to this group by a recent 

 authority, but I have satisfied myself that none are present by an 

 examination of specimens. The sides of the foot are as smooth as 

 in Helcioniscus exaratus. 



