PECTEN.— Plate XXVIII. 



Species 120. (Mus. Cuming.) 



Pecten triradiatus. Fed. testa stcborbiculari, com- 

 presso-convexd, aquilaterali, aquivalvi, valvis costis 

 viginti rotundatis squamato-crenatis radiatis, intersti- 

 tiis excavatis ; palUde carneo-variegatd, radiis tribus 

 centralibits albis notatd ; aurimlk valde inaquaUbus. 



The three-rayed Pecten. Shell nearly orbicular, com- 

 pressly convex, equilateral, equivalve, valves rayed 

 with twenty rounded, squamately creuulated ribs, 

 the interstices between which are excavated ; varie- 

 gated with pale flesh-colour, marked with three cen- 

 tral white rays ; ears very unequal. 



Hab. ? 



A distinct and weU-marked species, though of simple 

 character. 



Species 121. (Mus. Cuming.) 



Pecten erubescens. Pect. testa orbkulari, snbceqidla- 

 terali, inaquivalvi, valvd sinUtrd subpland, dextrd coii- 

 vexd, ambabus costis viginti angiistis obsolete crenatis 

 radiatis, interstitiis subprofundis ; alba, incarnato-roseo 

 pallide tinctd, ef prope umbones sparsim punctata, valvd 

 dextrd pallidiore ; auriculis subaqualibus. 



The blushing Pecten. Shell orbicular, nearly equila- 

 teral, inequivalve, left valve rather flat, right valve 

 convex, both valves rayed with twenty narrow obso- 

 letely crenated ribs, the interstices between which 

 are rather deep ; white, faintly tinged with flesh- 

 pink, sparingly spotted near the umboes, right valve 

 the paler ; ears nearly equal. 



Rab. ? 



Coloured with a delicate blush tinge of flesh-pink. 



Species 122. (Fig. a, b, Mus. Cuming.) 



Pecten tigeinus. Pect. testd trigono-orbiculari, aquila- 

 terali, aquivalvi, valvis, sub lente, minutissime corru- 

 gato-decussatis, et radiatim Uratis, nunc lavibus, nunc 

 quinquecostatis, costis subnodosis ; purpureo-rufd, albo 

 sparsim undato-maculatd ; auriculis valde inaqualibus. 



The tiger-marked Pecten. Shell triangularly orbi- 

 cular, equilateral, equivalve, very minutely wrinkle- 

 decussated beneath the lens, and radiately ridged, 

 now smooth, now five-ribbed, ribs slightly noduled ; 

 purple-red, sparingly wave-blotched with white ; ears 

 very unequal. 



MuLLEE, Zoologia Danica, pi. 60. f. 6, 7, 8. 

 Ostrea tigrina, Gmelin. 



Pecten lavis and obsoletus, Pennant. 

 Pecten domesticus, Chemnitz. 

 Pecten Armoricanus, Chenu. 

 Hab. Celtic and Northern Europe (in twelve to sixty 

 fathoms) ; Forbes and Hanley. 



Extremely variable in sculpture, but not differing ma- 

 terially in colour. 



Species 123. (Mus. Cuming.) 



Pecten fulvicostatds. Pect. testd suboblique trigono- 

 ovatd, altiore quam longd, tenui, compressd, inceqttila- 

 terali, subeequivalvi, valvis decemcostatis, undique tenui- 

 liratis et, sub lente, minutissime granulatis ; pellucido- 

 albd, costis pallide fulvis, valvd sinistra punctis per- 

 paucis carminek prope umbonem pictd ; auriculis valde 

 inaqualibus. 



The yellow-ribbed Pecten. Shell rather obliquely 

 triangularly ovate, higher than long, thin, com- 

 pressed, inequilateral, nearly equivalve, valves ten- 

 ribbed, finely edged throughout, and, beneath the 

 lens, very minutely granulated ; transparent-wliite, 

 ribs pale yellow, left valve painted near the umbo 

 with a few carmine dots ; ears very unequal. 



Adams and Keeve, Zool. Voy. Samarang, MoUusca, p. ~ii. 

 pi. 21. f. 11. 



Hab. Sooloo Ai-chipelago. 



A thin semitransparent shell, rayed with ten conspicu- 

 ous yellow ribs, while the left valve is painted with a few 

 characteristic lake-red dots. 



Species 124. (Mus. Cuming.) 



Pecten limatdla. Pect. testd ovatd, altiore quam longd, 

 subcompressd, tenui, semipellucidd, cequilaterali, vix 

 csquivalvi, midique dense Uratis, liris .squamis parvis 

 subdistaniibus nitide asperatis ; alba, valvd sinistra 

 purpureo-lacco pallidissime, et etiam intense, sparsim 

 maculatd ; auricul'is valde inaqualibus. 



The small file Pecten. Shell ovate, higher than long, 

 rather compressed, tliin, semitransparent, equilateral, 

 scarcely equivalve, everj'where densely ridged, the 

 ridges being neatly roughened by small rather dis- 

 tant scales ; white, left valve very faintly and also 

 very deeply blotched with purple-lake ; ears very un- 

 equal. 



Hab. ? 



Very delicately and elaborately sculptured with small 

 suberect scales on close-set rid2;es. 



