PECTEN 



Plate VI. 



Species 26. (Mus. Cuming.) 



Pecten ieradians. Fed. tedd subquadrato-orhiculari, 

 inaqidvalvi ; valm sinistra conoexd, dextrd convexiore, 

 (epdlaterali, valvis concentrice creberrime tenuistriatis, 

 costis quindecim ad sexdecini convexis snbelevaiis radi- 

 atis ; valvd sinistra cieruleo-nigrd aut fused, alho mar- 

 moratd, dextrd pallidiore, scepe albd ; auricuUs sub- 

 cBqualibus, anticis paulidum emarginatis. 



The beaming Pecten. Shell somewhat squarely orbi- 

 cular, inequivalve ; left valve convex, right valve more 

 convex, equilateral, valves conceutrically very closely 

 finely striated, rayed with fifteen to sixteen slightly 

 raised convex ribs ; left valve blue-black or brown, 

 mottled with white, right valve paler, often white ; 

 ears nearly equal, the front ones a httle emarginated. 



Lamarck, Aiiira. sans vert. (Deshayes' edit.) vol. vii. 

 p. 143. 



Pecten turgidus, Sowerby (not of Lamarck). 

 Pecten. concentricus, Say. 



Hab. Mediterranean, 



The bkiish colouring of this species, which runs into 

 the mottled white spaces, is characteristic. 



Species 27. (Mus. Cuming.) 



Pecten corallinoides. Pect. testa suhorbicidari, tequi- 

 valvi, vix (sqidlaterali ; valvis suhventrieosis, crassis, 

 costis novem ad decern grandibus turgidis ampliter no- 

 datis radiatis, costis interstitiisque radiatim serrato- 

 liratis, costis valva dextrm majoribus ; albidd aid pur- 

 pureo-fmcd, intense coralllo-rubro plus minus tinctd 

 et punctata, valvd dextrd pallidiore, stepe albd ; auri- 

 cuUs valde inaqualibus. 



The coral-like Pecten. Shell somewhat orbicular, 

 equivalve, scarcely equilateral ; valves subventricose, 

 thick, rayed with nine to ten large, swollen, largely 

 knobbed ribs, ribs and interstices radiately serrately 

 ridged, ribs of the right valve larger ; whitish or 

 purple-brown, more or less stained and dotted with 

 deep coral-red, right valve paler, often white ; ears 

 very unequal. 



D'Orbigny, Moll, des Isles Canaries, p. 103. 



Hab. Zanzibar. 



Very closely allied to Pecten nodosus, but of much 

 smaller size, and of a peculiar coral-red painting, stained 



chiefly ou the swollen knobs of the left valve. The speci- 

 men here figured is unusually large. 



Species 28. (Mus. Cuming.) 



Pecten pes-anatis. Pect. testa suborbiculari, tenuiculd, 

 irregidari, (Tqullaterali, subcequivalvi ; valvis radiatim 

 elevato-striatis, costis qidnque tumidiuscuUs distantibus 

 radiatis; valvd sinistra albidd, fuscescente tinctd et 

 punctatd, costis lividis, dextrd albd; auricuUs valvce 

 sinistra subcequalibus, dextrie inaqualibus. 



The duck's-foot Pecten. Shell somewhat orbicular, 

 rather thin, irregular, equilateral, nearly equivalve ; 

 valves radiately elovately striated, rayed with five, 

 rather swollen, distant ribs ; left valve whitish, 

 stained and dotted witli light brown, ribs livid, right 

 valve white ; ears of the left valve nearly equal, of 

 the right valve unequal. 



Hab. Moluccas. 



A thin species, of curious irregular growth, rayed with 

 five distant livid ribs, having sometimes a trace of an in- 

 termediate rib. 



Species 29. (Mus. Cimiing.) 



Pecten zicz AC. Pect. testa orbiculari,inaguivalvi; valvd 

 siniMrd concavo-pland, dextrd valde convexd, aquilate- 

 rali ; valvd sinislrd concentrice tenuissime striatis, ra- 

 diatim sulcatis, sulcis ad triginti, irregularibus, dextrd 

 sulcis ad viginti radiatis, sulcis linearibus, regularibus ; 

 rvfo-pmpured, valvd sinistrd cinereo promiscue radi- 

 atd, maculisque paucis albis aspersd ; auricuUs aquali- 

 bus, distanter sulcatis. 



The zigzag Pecten. Shell orbicular, inequivalve ; left 

 valve concavely flattened, right valve extremely con- 

 vex, equilateral ; left valve concentrically very finely 

 striated, radiately grooved, grooves about thirty, irre- 

 gular, right valve rayed with twenty grooves, which 

 are linear and regular ; reddish-purple, left valve j)ro- 

 miscuously rayed with ash, and sprinkled with small 

 white spots ; ears equal, distantly grooved. 



Ostrea ziczac, Linnaius, Syst. Nat. p. lli-i. 

 Pecten, ziczac, Chemnitz. 



Hab. Red Sea and PhiKppiue Islands. 



This well-known species is remarkable for its very in- 

 equivalve proportions, and rich colouring. 



November, 1852. 



