164 TESTACEOUS MOLLUSCA. 



P. Striatularis. Lam. 13.— Reeve. Ic. f. 27? Ovate 

 heart-sliaped, transverse, reddish -white under a brown silky epi- 

 dermis, with very numerous fine longitudinal striae ; beaks rather 

 oblique ; within white with a large stain of reddish brown. 1^. — 

 New Holland. 



P. Intermedius. Brod. Z. P. 1832. — Reeve. Ic. f. 1. 

 Suborbicular, subglabrous, subdepressed, whitish, with pale 

 chesnut radiating zones near the umbo, with rather distant radiating 

 decussated striae : inside white, the margins crenated : epidermis 

 somewhat velvety. 1^ . . If- — Iquiqiii. 



P. Ovatus. Brod.^Z. P. 1^2,2.— Reeve. Ic. f. 2. Exactly 

 oval, longer than broad, convex, glabrous with very minute trans- 

 verse lines, whitish, the umbones pale chesnut : inside white, the 

 margin crenulated ; the epidermis somewhat downy. If . . 1^. — 

 Pacific. Closely resembling the last, hut ynuch more elongated. 



P. LiNEATUS. Reeve. Z. P. 1843. — Reeve. Ic. f. 2.5. Orbi- 

 cular convex, slightly auriculated, decussately striated, longitudinal 

 strise the stronger, whitish clouded anteriorly and about the middle 

 with chesnut spots and vividly painted posteriorly with dark lon- 

 gitudinal lines: umbones central. If. — TVest Indies. Closely 

 allied to Pennaceus. 



P. Maculatus. Brod. Z. P. 1832.— Reeve. Ic. f. 4. Orbi- 

 cular, slightly eared, subequilateral, convex, whitish spotted with 

 chesnut, somewhat decussated with thick set radiating strise : in- 

 terior white, margin crenated : epidermis brown and downy. 

 2f . . 2f . — Central America. 



P. Giganteus. Reeve. Ic. f. 3. Orbicular, very convex, 

 (depressed when young) solid, large, with longitudinal close and 

 regular striae and almost obsolete grooves ; white stained with 

 chesnut towards the ventral edge, middle and umbonal portion 

 profusely and vividly painted with waved reddish brown spots 

 touching each other for the most part on both sides : interior 

 white, margins of the adult of bright shining chesnut, crenated : 

 epidermis thick and hairy. 4. — California. Allied to the Un- 

 datus of Lin7i(BUS. 



P. Multistriatus. Desh. — Reeve. Ic. f. 42. — Arca M. 

 B.p. 224.— A. Striata. Ginel. 3308.— TF. t. 9. /. 41.— C7i. 

 /. 537. — jEJ. t. 311. f. 71 Triangularly orbicular equivalve, sub- 

 equilateral, compressed, with numerous fine longitudinal striae 

 rufous ; beaks incurved and the area between them narrow ; 

 within brown, the margin flattened and quite entire. 1. — Red 

 Sea. Extremely delicate transverse strice at intervals. 



* * With prominent radiating longitudinal ribs, either with or 

 without transverse strice. 



P. Castaneus. Lam, 15.— TF. t. 9. — Reeve. Ic. f. 32. 



