PECTEN. 



Plate XL 



Species 41. (Mus. Saul.) 

 Pectek modestus. Pect. testa oblongo-ovatd, aquQate- 

 rali, iiuequivalvi, coslis ad diiodecim radiatd ; valvd 

 sinistra planulatd, prope umhonem concavd, in valvd 

 dextra stibimmeisd, costis pai'viiisculis, convexis, re- 

 motis, albd, maculis peipattcis purpiireo-castanteis propie 

 margiiiem pictd ; valvd dextrd gibhoso-eonvexd, costis 

 latis, subqnadratis, medio sulcalis, purpiirascente-albd ; 

 auriculis aqvalibus. 

 The modest Pecten. Shell oblong-ovate, equilateral, 

 inequivalve, rayed with about twelve ribs ; left valve 

 flattened, concave near the umbo, a little immersed 

 iu the right valve, ribs rather small, convex, distant, 

 white, painted near the margin with a very few pur- 

 ple-chestnut blotches ; right valve gibbously convex, 

 ribs broad, somewhat square, grooved down the mid- 

 dle, purple-white ; ears equal. 

 Hab. Moreton Bay, Australia. 



Of a peculiar purplish-white tinge, very sparingly spot- 

 ted. The ribs of the convex valve are peculiarly charac- 

 terized by a single groove running down the middle. 



Species 43. (Mus. Saul.) 



Pecten eilosus. Pect. testa subglobosd, subaquilaterali, 

 inaquivalvi, costis duodecim radiatd; valvd sinistra 

 subconcavd, in valvd dextrd immersd, costis subphuiii- 

 latis, albidd, purpureo-rufo promiscue tenuilineatd et 

 tinctd, costis saturatioribus ; valvd dextrd convexd, valde 

 ffibbosd, costis planulato-couvexis, albd, lineis teuuibus 

 ntfis promiscue pictd ; auriculis aqualibus. 



The thueab-painted Pecten. Shell somewhat glo- 

 bose, nearly equilateral, inequivalve, rayed with 

 twelve ribs ; left valve slightly concave, immersed in 

 the right valve, ribs rather flattened, whitish, pro- 

 miscuously finely lineated and stained with purple- 

 red, ribs darker; right valve convex, very gibbous, 

 ribs rather flatly convex, white, promiscuously painted 

 with fine red lines ; ears equal. 



Hab. Moreton Bay, Australia. 



Another very distinct new species from Australia. 



Species 43. (Mus. Cuming.) 

 Pecten hastatus. Pect. testd trigono-ovatd, altiore quam 



longd, (Bquilaterali, nisi atiriculis valde inaqualibus, 

 (nqniralvi, valvis leviter convexis, sinistrd costis decern 

 anyustis spinoso-squamatis lirisque numerosis minute 

 squamatis radiatd, plus minus intense rosed; valvd 

 dextrd costis vigiuti minus elevatis lirisque numerosis 

 squamatis radiatd, albidd, prope marginem roseo tinctd. 



The speaked Pecten. Shell triangularly ovate, higher 

 than long, equilateral, unless as respects the ears 

 which are very unequal, equivalve, valves slightly 

 convex ; left valve rayed with ten narrow spine-scaled 

 ribs, and numerous minutely scaled ridges, more or 

 less deep pink ; right valve rayed with twenty ribs, 

 less raised, and numerous scaled ridges, white, stained 

 with pink near the margin. 



SoWEHBY, Thesaurus Conch, vol. i. p. 73. pi. 30. f. 336. 



Hab. ? 



Of this very delicate and elaborately sculptured species 

 two specimens are now known, one in Mr. Cuming's and 

 one in Miss Saul's collection. A peculiarity in it worth 

 noting is that each spine-scaled rib in the left valve is re- 

 presented by two smaller ribs in the right valve, and on 

 these the scales are less spinous. 



Species 44. (Mus. Cuming.) 



Pecten medius. Pect. testd suborbiculari, subaqtdlaterali, 

 inaquivalvi, costis quatuordecim ad quindecim radiatis ; 

 valvd sinistrd plantdatd, prope umbonem concavd, in 

 valvd dextrd immersd, costis angustis, convexis, distan- 

 tibus, rufo-fusco paruni maculatd ; valvd dextrd con- 

 vexd, costis plano-convexis, Icevibua, albd; auriculis 

 (equalibus. 



The middle Pecten. Shell orbicular, nearly equilateral, 

 inequivalve, rayed with fourteen to fifteen ribs ; left 

 valve flattened, concave near the umbo, immersed in 

 the right valve, ribs narrow, convex, distant, but little 

 spotted with red-brown ; right valve convex, ribs 

 flatly convex, smooth, white ; ears equal. 



Lamakck, Anim. sans vert. (Deshayes' edit.) vol. vii. 

 p. 130. 



Hab. West Indies. 



Chiefly distinguished from P. maximns and Jacobieus by 



the smooth polished character of the right ribs. 



December, 1853. 



