PECTEN. 



Plate XXXV. 



Species 167. (Mus. Brit.) 



Pecten concinntjs. Pect. testa trigono-ovatd, valvd si- 

 nistra suhplannlaid, costis iiovem rotundatis, valde ele- 

 vatis, subdistantibus radiatd, iiderstitiis subampliter 

 excavatis, costis interstitiisque eleganter minute squa- 

 mato-liratis ; albidd, costis uudique rerjulariter roseo- 

 mactilatis ; auriculis inreqnalibus. 



The pretty Pecten. Shell triaugularly ovate, left valve 

 rather flattened, rayed with nine rather distant, 

 rounded, very elevated ribs, with the interstices 

 rather largely excavated, ribs and interstices ele- 

 gantly minutely scale-ridged ; wliitish, ribs regularly 

 rose-blotched thi'oughout ; ears unequal. 



Sab. Eed Sea. 



An elegantly painted and neatly sculptured shell, of 

 which the only specimens known to me are two valves in 

 the British Museum, both left valves. 



Species 168. (Mus. Cuming.) 



Pecten argenteus. Feet, testa suborbiculaii, teimi,pel- 

 lucidd, compresso-convexd, aqnilaterali, subceguivalvi, 

 valvis costis decern rotimdatis concentrice siriatis radia- 

 tis, interstitiis latiiiscuUs, decussatim striafis ; argen- 

 teo-albd, fusco in interstitiis maculatd et punctata ; 

 auriculis aqualibtts. 



The silvery Pecten. Shell nearly orbicular, thin, trans- 

 parent, compressly convex, equilateral, nearly equi- 

 valve, valves rayed with ten concentrically striated 

 rounded ribs, interstices rather broad, decussately 

 striated ; silvery-white, spotted and dotted with brown 

 in the interstices ; ears equal. 



Hab. China Sea. 



A transparent white shell, dotted in the interstices be- 

 tween the ribs with brown. 



Species 169. (Mus. Cuming.) 



Pecten tenellus. Pect. testa ovatd, tenuiculd, com- 

 presso-convexd, aqnilaterali, vix aquivalvi, valvis cos- 

 tis quinque lavibits radiatis, liris tribus intervenienti- 

 bus, costd posticd extremd squamd magna ad marginem; 

 rosed, immaculatd, ad latera albipunctatd ; atiricuUs 

 grandibus, expansis, inaqualibus, ad marginem squa- 

 matis. 



August, 



The delicate Pecten. Shell ovate, rather thin, com- 

 pressly convex, equilateral, scarcely equivalve, valves 

 rayed with five smooth ribs, with three ridges coming 

 between, the extreme posterior rib with a large scale 

 at the margin ; pink, unspotted, wliite-dotted at the 

 sides; ears large, expanded, unequal, scaled along 

 the margin. 



Eab. ? 



This has the appearance of being an immature shell, but 

 it is, nevertheless, of marked character. 



Species 170. (Mus. Cuming.) 



Pecten lentiginosus. Pect. testa trigono-ovatd, subjla- 

 beUiformi, compressd, aquilaterali, inceqtdvalvi, valvd 

 sinistra costis lirisque numerosis grandibus et parvis, 

 profuse noduloso-sqiiamatis, subirregnlariter radiatd, 

 valvd dexird ecostatd, midique liratd, squamis brevibtts, 

 abrupte nodidosis ; purpurascente-albd, intense purpu- 

 rea liic illic tinctd et inaculatd; auriculis valde in- 

 aqualibus, Jlexuosis. 



The speckled Pecten. Shell triangularly ovate, some- 

 what fan-shaped, compressed, equilateral, equivalve, 

 left valve somewhat irregularly rayed with numerous 

 large and small ribs and ridges, profusely nodulously 

 scaled, right valve not ribbed, ridged throughout, 

 with the scales short and abruptly nodulous ; pur- 

 plish-white, stained and spotted here and there with 

 deep pui-ple ; ears very unequal, flexuous. 



Hab. ? 



A very characteristic new species, easily recognizable by 

 the details above noted. 



Species 171. (Mus. Hinds.) 



Pecten fasciculatus. Pect. testa late snbfrigond, pla- 

 niusculd, tenui, incequiauriculatd, rufo-violascente, albo 

 maculatd, valvis consimilibus, costis parvis, numerosis, 

 eleganter serratis, infascibus quinque plej'umque aggre- 

 gatis, alteris interstitiis suppleiis ; auriculis inaquali- 

 bus, rectis, argute serratis, dentatis, infus violascente. 



The bunched Pecten. Shell broadly subtriangular, 

 rather flat, tliin, unequal-eared, reddish-violet, spot- 

 ted with white, valves veiy like, ribs small, nume- 

 rous, elegantly serrated, generally aggregated in five 

 bunches, the others filling the interstices ; ears un- 



1853. 



Y 



^' 



