TESTACEOUS MOLLUSCA. 273 



often light reddish brown banded and variegated with purplish 

 brown, much lighter on the lower valve ; there is also a bright 

 orange variety and a white one. Variety. P. Lineatus. Da Cost. 



t. 10. /. 8.— Mont. p. 147.— Lam. 35 Osteea L. Don. t. 116. 



— D. p. 266.— W. t. IV. f. 44. White with a red line on the 

 top of each rib. 2 T 3 ...2^. Britain, Mediterranean. 



P. Audouinii. Payr. p. 77. t. 2, /. 8. — P. Subrufus. 

 Soic. Th. f 208, 9, 10. — Suborbicular, rather compressed, 

 anteriorly subattenuated, scabrous ; ears nearly equal, stri- 

 ated, obtuse, the posterior of the lower valve rather large and 

 emarginated at the base ; ribs twenty, angulated, their angles 

 serrated ; the sides concentrically striated, the interstices with 

 scabrous striae : colour variable, reddish brown with white ziczacs, 

 purple, variegated, and pale orange variegated with brown and 

 white. 2f..2i. Mediterranean. The Subrufus of Pennant is a 

 variety of the last. 



P. Exasperatus. Sow. Th. t. 183./. 186. Rounded-subqua- 

 drate, rather ventricose, scabrous; ears large, with scabrous striae; 

 ribs eighteen, subangular, the angles serrated, the sides with ser- 

 rated striae, the interstices with scabrous striae ; variations of 

 colouring similar to the last. \...\%. Mediterranean. 



P. Bifrons. Lam. 4.— Reeve. Sys. t. 114*./. 8.— Sow. Th.f. 9, 

 10. Subequivalve, subequilateral, orbicular, posteriorly less 

 spread, scabrous ; ears broad, quadrate, striated, the anterior 

 slightly the smaller ; with nine little elevated, rounded ribs, ar- 

 ranged in twos or threes ; interstices broad, with irregular radia- 

 ting ribs ; upper valve pale purple, with blackish-red ribs which 

 are spotted near the umbones ; lower valve white, the ribs red ; 

 purple within, 2^..2J-. 



P. Patagonicus. King, Z. J. — Sow. Th. f. 60. Rounded, 

 rather ventricose, nearly smooth ; ears striated and obtuse, the 

 posterior the larger ; pale fawn with thirty-four reddish brown 

 nearly square smooth and elevated ribs. 2f . . . 2 f. Patagonia. 



P. Solaris. Born. t. 6. /. 4!.— Sow. Th.f. 7,8,22.— Phil. Conch. 

 Pecten. t. 2,/. 2. — Ostrea S. D.p. 264. Rounded, subequivalve, 

 subequilateral, flat ; ears small, nearly equal, smooth ; pale red 

 variegated with irregular bands and lines of red and white, or white 

 with irregular bands of red spots ; with eighteen smooth rounded 

 and equal ribs having their interstices broad and substriated ; in 

 the lower valve, the ribs are broader, more or less striated and with 

 scarcely any interstices. 2j..2^. Macassar fy China. 



P. Obliteratus. Lam. 8. — Sow. Th.f. 126. — Ostrea O. Lin. 

 1146— W. t. 10./. 25. — Gualt. t. 73. f. C.—D. p. 258.—Knorr. 

 5. t, 21. /. G. ISuboval, smooth, semitransparent, compressed, 



T 



