P E C T E N . 



Plate YIIl. 



Species 33. (Mus. Cuming.) 



Pecten Sinensis. Pect. testa suhelougato-ovatd, cBqui- 

 laterali, incequivalm ; valvd sinistra excavaio-concavd, 

 ill dextrd immersd, eostis undecim subangustis convexo- 

 plaimlatis utrinque suhangulatis radiatd, rvfescente- 

 fuscd, maculis albidis angularibus riifo-marginatis in- 

 terdum adspersd ; valvd dextrd convexissimd, eostis 

 latis, convexis, confertis, radiatini sulcatis, cinereo-rufd, 

 versus mnbonem imlistincte marmoratd ; auriculis niag- 

 iiis, sinistrorsum incliuatis. 



The Chinese Pecten. Shell i-ather elongatcly ovate, 

 equilateral, inequivalve; left valve excavately con- 

 cave, immersed in the right valve, rayed with eleven 

 rather narrow convexly flattened ribs, slightly angled 

 on both sides, reddish-brown, sometimes sprinkled 

 with red-edged angular white spots ; right valve very 

 convex, with the ribs convex, broad, close-set, and ra- 

 diately grooved, ash-red, mottled towards the umbo ; 

 ears large, bent over towards the left valve. 



SowERBY, Thesaurus Conch, vol. i. p. 48. pi. 16. f. 120, 

 121, and 134. 

 Pecten excavatus ? Anton. 



Rati. China. 



Chiefly characterized by the concavely immersed growth 

 of the left valve, which is most conspicuous in the young. 



Species 34. (Mus. Saul.) 



Pecten floeidus. Pect. testd vix elongato-ovatd, eequila- 

 terali, iiuequivalvi ; valvis compressis, concentrice te>iui- 

 striatis, eostis octodecim radiatis ; valvd sinistra pland, 

 medio subconvexd, eostis valde elevatis, angustis, medio 

 angulatis, dextrd convexd, eostis valde elevatis, pro- 

 miueutibus, utrinque angulatis, medio sulcatis ; valvd 

 sinistrd roseo-fuseeseente, obscure maculatd, dextrd pal- 

 lidiore, immaculutd ; auriculis aqualibus. 



The florid Pecten. Shell rather elongatcly ovate, 

 equilateral, inequivalve ; valves compressed, concen- 

 trically finely striated, rayed with eighteen ribs; left 

 valve flat, slightly convex in the middle, with the ribs 

 much raised, narrow, angled in the middle ; right 

 valve convex, with the ribs much raised, prominent, 

 angulated on each side, grooved down the middle ; 

 left valve rose-brown, obscurely spotted, right valve 

 paler, unspotted ; ears equal. 



Hinds, Moll. Voy. Sulphui-, p. 60. pi. 17. f. 6. 



Hab. San Diego, California (in mud at the depth of five 

 fathoms) ; Belcher. 



Remarkably distinguished by the prominent develop- 

 ment of the ribs, which in the left valve are sharply angled 



in the middle, and in the right valve are squared and then 

 grooved in the middle. 



Species 35. (Mus. Cuming.) 



Pecten fuscds. Pect. testd subelongato-ovatd, aquila- 

 terali, incequivalvi ; valvd sinistra pland, prope umho- 

 neni eoneavd, in valvd dextrd subimmersd, eostis qua- 

 tuordecim convexis subangustis radiatd, fuscescente, us- 

 tulato-fusco tinetd et obscure maculatd; valvd dextrd 

 convexd, eostis quindecim plano-convexis latioribus ra- 

 diatd, livido-cinered, prope mnbonem rufescente matu- 

 latd ; auriculis majusculis, sinistrorsimi inclinatis. 



The brown Pecten. Shell somewhat elongately ovate, 

 equilateral, inequivalve ; left valve flat, concave near 

 the umbo, a little immersed in the right valve, rayed 

 with fourteen rather narrow convex ribs, light brown, 

 stained and obscurely spotted with burnt brown ; 

 right valve convex, rayed with fifteen flatly convex 

 broader ribs, Kvid-ash, spotted with light red near 

 the umbo ; ears rather large, bent over towards the 

 left valve. 



Klein, Sowerby, Thesaurus Conch, vol. i. p. 47. pi. 16. 

 f. 118, 119. 



Hab. Moreton Bay, East Australia ; Strange. 



Of the same peculiar livid-ash colom' on the right valve 



as in P.fumatus. 



Species 36. (Mus. Cuming.) 



Pecten Nov.e-Zelandi.e. Pect. testd subelongato-orbi- 

 culari, csquilaterali, inaqnivalvi ; valvis concentriee 

 minutissime striatis ; sinistra plana, prope mnbonem 

 eoncaviusculd, in valvd dextrd subimmersd, eostis sub- 

 angustis convexis quatuordecim nitide radiatd, albi- 

 cante, spadieeo-rvfo tinetd ; dextrd expanso-convexd, 

 eostis quindecim sublatioribus radiatd, albd ; auriculis 

 aqualibus, sinistrorsum subinelinatis. 



The New Zealand Pecten. Shell somewhat elon- 

 gatcly orbicular, equilateral, inequivalve ; valves very 

 minutely concentrically striated ; left valve flat, 

 rather concave near the umbo, a little immersed in 

 the right valve, neatly rayed with foui'teen rather 

 narrow convex ribs, whitish, stained with fawn-red ; 

 right valve expandedly convex, rayed with fifteen 

 rather broader ribs, white ; ears equal, bent a little 

 forwards towards the left valve. 



Eab. New Zealand; Hart. 



A beautifully symmetrical neatly-ribbed species, of a 



delicate subtransparent white, stained on the left valve 



with rich fawn-red. 



November, 1852. 



