PECTEN. 



Plate XIII. 



Species 48. (Mus. Cuming.) 



Pecten pleueonectes. Pect. testa, suborbicidari, aqwi- 

 laterali, tenuieuld, cequivalvd, lavi, compressd, utrinque 

 subhiante, auriculis (equalibus, parvis, obticsis, interne 

 costis duodecim duplicatis, vel quatiior et viginti sin- 

 gulis radiatd; valvd sinistra livido-fulvd aut purpuras- 

 cente, lineis temiibus radiatd, dextrd albd. 



The eib-eayed Pecten. Shell nearly orbicular, equi- 

 lateral, rather thin, equivalve, smooth, compressed, a 

 little gaping on each side, auricles equal, small, ob- 

 tuse, rayed internally with twelve pairs of ribs or 

 twenty-four single ones ; left valve livid-fulvous or 

 purplish, rayed with fiue lines, right valve white. 



Ostrea pleuronectes, Linnaeus, Syst. Nat. (13th edit.) 

 p. 1145. 

 Pecten pleuronectes, Lamarck. 



Hab. China. 



Chiefly distinguished from P. Japonicus by its smaller 



size, and line-rayed painting. 



Species 49. (Mus. Cuming.) 



Pecten distans. Pect. testa sabaltiore quam longd, sub- 

 ceqidvalm, aquilaterali, auriculis subgraudibus ; valvis 

 decemcostatis, costis sulcisque amplis, prominentibus, 

 tenuiliratis, valvd sirmtrd ustulato-nigricante, albo- 

 maculato, dextrd albd vel lutescente tincid. 



The distant Pecten. Shell rather higher than long, 

 nearly equivalve, equilateral, auricles rather large ; 

 valves ten-ribbed, ribs aud grooves large, prominent, 

 finely-ridged, left valve burnt-black, marbled with 

 white, right valve white or yellowish. 



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

 p. 139. 



Hub. Philippine Islands ; Cuming. 



A strongly-developed species, with the ribs and inter- 

 stices in both valves of about the same width. 



Species 50. (Mus. Cuming.) 



Pecten sulcatus. Pect. testd suborbicidari, temdculd, 

 aquivalvi, subaqiiilaterali ; valvis decemcostatis, costis 

 latiusculis, parum elevatis, sulcisque temdUratis, valvd 

 sinistrd cinereo-fulvd, puncfis idgris aspersd, dextrd 

 lutescente, umbonem versus fusco-punctatd. 



The grooved Pecten. Shell nearly orbicular, rather 

 thiu, equivalve, nearly equUateral ; valves ten-ribbed, 

 ribs rather broad, but little raised, with the grooves 

 finely ridged, left valve ash-fulvous, sprinkled with 

 black dots, right valve yellowish, brown-dotted to- 

 wards the umbo. 



Born, Mus. Ca3s. Vindobonensis, pi. 6. f. 3. 



Hab. Mediterranean . 



Tins is doubtless the same species as Lamarck's P. sul- 

 catus, though he has omitted any reference to Born. It 

 approximates hard upon P. glaber. 



Species 51. (Mus. Cuming.) 



Pecten Magellanicus. Pect. testd orbicidari, subaqui- 

 laterali, paululum Mante, inmquivalvi, sinistra convexd, 

 tumidinscidd, pnrpurascente-nd)rd, dextrd nmlto plani- 

 ore, albidd, amhabus ereberrime radiatim scabro-siriatis, 

 umbonibus violaceis. 



The Magellan Pecten. Shell orbicular, nearly equi- 

 lateral, a little gaping, inequivalve, left valve convex, 

 rather swoUen, purple-red, right valve much flatter, 

 whitish, both very closely radiately rough-striated, 

 umboes violet. 



Ostrea MagelUmica, Gmelin, Syst. Nat. p. 3317. 

 Pecten Magellanicus, Lamarck. 



Eab. Banks of Newfoundland. 



The name of this species, suggested by a wrong locality, 

 should be changed, were there not considerations on the 

 subject of nomenclature which forbid it. 



February, 1853. 



