156 UNIDENTIFIED LIMPETS. 



P. JACKSONIENSIS Lesson (Voy de la Coq. Zool. ii, p. 418, 1830). 

 A species said to resemble P. vulgata. From Port Jackson, N. S. 

 Wales. 



P. GRANULOSA Lesson (Voy. de la Coq. Zool. ii, p. 422, 1830). 

 Island of Bum. (Bourou.) 



P. GIGANTEA Lesson (Voy. de la Coq. Zool. ii, p. 423, 1830). 

 A very large shell, length 7, breadth 5 inches. It is massive, very 

 thick, oval, convex, submedian. Muscle-impression deeply marked. 

 Interior smooth, whitish, the cavity reddish. Outside covered with 

 Serpula tubes. Coral reefs off Borabora, Society Is. 



P. OBLONGA Perry (Conchology, t. 43, f. 4). Unknown and un- 

 knowable. 



P. LAMPEDUSENSIS De Greg. An unfigured, imperfectly described 

 form, from the Sea of Lampedusa. (Bull. Soc. Mai. Ital., x, p. 121.) 



P. GRANULATA Philippi. 



Shell ovate-elliptical, depressed, brown, tessellated with little-con- 

 spicuous brown spots ; roughened by elevated very close, minutely 

 granose radiating lines. Apex at the front fifth of the length. In- 

 terior bluish, margin brown, articulated with whitish. Length 10, 

 breadth 71, alt. 2 lines. (PA.) 



China. 



P. granulata PH., Zeitschr. f. Mai. 1848, p. 162. 



Compare Acmcea schrenckii and concinna. 



P. ALBA Hombron & Jacquinot. 



Shell ovate-elliptical, depressed, white ; having sharp carinated 

 crests, toothing the margin ; apex excentral, obtuse. Interior white, 

 shining, the depth and the margin submaculated with black. 

 Length 37, breadth 30 mill. (H. & J. in Ann. des Sci. Nat. (2), 

 xvi, 1841, p. 190.) 



Tahiti. 



P. TESSELLATA Hombron & Jacquinot. 



Shell elevated-elliptical, convex-conic ; yellow outside and inside, 

 ornamented with undulating, transverse black-reddish lines and 

 bands ; having close radiating striae, the chief of which number 

 ^-bout 32. Vertex acute, gray ; cavity of the same color. Length 



