252 TESTACEOUS MOLLUSCA. 



P. Carnea Gmel. 3305.— D. p. 320. partly— W. t. 12. /. 0.— 



P. Flabellum var. Lam. 2. — Kn. 2. t. 23. /. 1. — Schrot. 3. t. 9. 



/. 7. Subtriangular, not rounded at the margin, reddish rust or 



flesh coloured, with longitudinal nearly or quite unarmed ribs, and 



the sides nearly straight. 



P. Rigida Dilw. p. 827.— W. t. 12. /. 7.—E. t. 199. /. 4.— 

 P. Seminuda. Lam. 3.—Knorr. 2. t. 20./. l.—Seba. 3. t. 91./. 3 

 — P. Nobilis. Ch.f. 715. Greyish-fulvous, rather short, about ten 

 or twelve rows of narrow distant strongly raised radiating sulci 

 armed with numerous semitubular narrow scales : ventral side de- 

 void of sulci and scales, the edge incurved near the beaks then 

 swelling out and running nearly in a straight direction to the broad 

 anterior base, which is but little rounded at either extremity ; f dorsal 

 or hinge margin the shorter, but elongated and incurved. Cu- 

 racoa. 



C. Angustana. Lam. 4. Narrow, wedge-shaped, horn co- 

 loured, the dorsal margin larger than the posterior : radiating sulci 

 fine and only armed with white vaulted scales towards the margin, 

 where the shell becomes brownish. Mediterranean. 



P. Nobilis. Lin. 1100.— Lin. Mas. TJlr. 144.— Ch. f. 776.— 

 E. t. 200./. 1. — Lam. 5. var.—D. p. 327.— W. t. 12. /. 8.— P. 

 Muricata. Poli. {not Lin, nor Lam.) t. 34. /. 1. — Phil. p. 75. 

 Elongated triangular, greyish orange, entirely covered with nume- 

 rous radiating raised sulci, which become obsolete near the broader 

 end, and are armed with crowded thin semitubular scales which be- 

 come erect as they recede from the beaks, and finally recurved: hinge 

 margin incurved, very long, angulated at its base, the anterior basal 

 line running obliquely but with more or less convexity to meet the 

 rounded extremity of the ventral edge, the latter nearly straight. 

 12. Mediterranean. 



P. Squamosa Gmel 3365.— Lam. 6—D.p. 329.— W. t. 13. /. 

 \3.—List.t. 374./. 215.— Ch. 787. and {young) f. 7M.—E. t. 200 

 /. 2. — Very large, elongated, reddish salmon coloured, very ventri- 

 cose in the middle, with obsolete radiating sulci but never ribbed, 

 when perfect covered at the extremity with crowded concentric rows 

 of very fragile slightly raised scalloped imbricated scales, but the 

 shell usually (< xcept when young or at the last layers of growth) 

 has the surface nearly worn smooth, preserving the vestiges of its 

 former scales by the scalloped concentric subimbricated lines ; 

 hinge margin incurved and (in the adult) much shorter than the 

 convex posterior ventral ; anterior ventral base rounded at both 

 sides. Up to 2 feet. Australia. 



P. Marginata. Lam. 7. — Phil. p. 75. — P. Bullata. Gmel. 

 3307.— W. t. 13. f. 20.— Gualt. t. 79./. C. Thin, fragile, pellucid, 

 whitish, longitudinally sulcated, and armed at the furthest extremity 

 from the beaks with four transverse rows of spines. 5\. — E. 

 Indies. 



