PECTEN. 



Plate XVIII. 



Species 64. (Fig. a, b, Miis. Cuming.) 



Pecten crassicostatus. Fed. testa mhrotundaid, iii- 

 terdum altiore qmm longd, ant ventricosd aid com- 

 presm, aqnivalvl, subaqnilaterali, costis quatuor et 

 viginti radiatd, costis ol/scure annulatis, lateralibus 

 squamatis, interstiliis lavibns ; carneo-albd, pallide ru- 

 fo-variegatd, aid pnrpurasceide, immaculatd ; aiiricuUs 

 valde inaqualibus, dense squamatis. 

 The thick-ribbed Pecten. Shell subrotundate, some- 

 times higher than long, either ventricose or com- 

 pressed, equivalve, nearly equilateral, rayed with 

 twenty-four ribs, which are obscurely ringed, lateral 

 ribs squamate, interstices smooth ; flesh-white, varie- 

 gated with pale red, or purple, unspotted ; ears very 

 unequal, densely scaled. 

 SowERBY, Thesaurus Conch, vol. i. p. 75. pi. 15 and 17. 

 f. Ill and 152. 



Hob. ? 



The shells here figured differ conspicuously in their ge- 

 neral aspect, but are merely diff'erent states of the same 

 species. 



Species 65. (Pig. a, b, Mus. Cuming.) 

 Pecten ssuamosus. Fed. testa subovali, sape altiore 



qiiam longd, subtpquivahi, snbirregulari, femiiculd, 

 plus minus compressd, costis diiodecim ad ododecim 

 subsquamatis planatis fere obsoletis lirisque plurimis 

 tenuibus radiatd, versus umbon.es plano-compressd ; au- 

 ricuUs valde inaqualibits ; colore varid, nunc purpureo- 

 f used, pallide imdato-variegatd, nunc luted vel aurantid, 

 alho circa umbones siepe peculiariter fulgm-atd. ' 



The squamose Pecten. Shell somewhat oval, often 

 higher than long, nearly equivalve, rather irregular, 

 rather thin, more or less compressed, rayed with 

 twelve to eighteen- subsquamate flattened almost ob- 

 solete ribs and numerous fine ridges, flatly compressed 

 towards the umboes ; auricles vei^y unequal ; colour 

 various, sometimes purple-brown, faintly wave-varie- 

 gated, sometimes yellow or orange, frequently deli- 

 cately Ughtning-marked with white round the um- 

 boes. 



Gmelin, Syst. Nat. Lister, Hist. Conch, pi. 184. f. 21. 



Hab. PhDippine Islands ; Cuming. 



Although varying remarkably in colour, the faint scratch- 

 like white lines roimd the umboes and on the ears are 

 very characteristic when present. The thin flattened obso- 

 letely scaled ribs and ridges are peculiar and constant. 

 At Plate XXT. is figured a brilliant orange variety of this 

 species. 



April, 1853. 



