PECTEN. 



Plate XXXI. 



Species 137. (Mus. Cuming.) 



Pecten circui,.\ris. Fed. tenia ijMmsa, ventricosimma, 

 (eqnilaleraU, inaqulvalei, valvis, dextrd convexiore, 

 eostis lavibiis fortibtis octodecim, interstitiis excavatis, 

 rarliatis; clnereo-albd, griseo-nigro iinctd et variegatd; 

 aurictdis cBqnalibus. 



TriE CIRCULAR Pecten. Shell globose, veiy ventricose, 

 equilateral, inequivalve, valves, right the more con- 

 vex, rayed with eighteen smooth strong ribs, of which 

 the interstices are excavated ; ash-white, stained and 

 variegated with greyish-black ; ears equal. 



SowERBY, Pro. Zool. Soc. 1835. p. 110. 



TFah. California (in sandy mud at seven fathoms) ; 

 Cuming. 



It is very doubtful whether this is anything more than 

 a variety of P. nucleus. 



Species 138. (Mus. Cuming.) 



Pecten denticulatus. Feci, tesld Irigono-ovald, alliore 

 quam longd, planulatd, compressd, tenui, subpellncidd, 

 aquilalerali, subcequivalvi, valvis radiatim Uratk, liris 

 valvee sinistra ad quindecim, angiistis, alleruaiim ma- 

 joribus, sqiiamulis parvis irregularibus, valvcB dextra 

 pennuUis, squainulis minoribus, acabroso-aculeatis ; au- 

 ricidis vfddS inaiqiiaUbus, superne denticulatis ; pellu- 

 cido-lutescente, rosea obsolete tincld. 



TiFE DENTICLED Pecten. Shell triangularly ovate, 

 higher than long, flattened, compressed, thin, sub- 

 transparent, equilateral, nearly equivalve, valves ra- 

 diately ridged, ridges of the left valve about fifteen 

 in number, alternately larger, fimbriated with small 

 irregular scales, of the right valve very numerous, 

 with the scales smaller and scabrou s- prickly ; ears 

 very unequal, denticulated along the upper edge ; 

 transparent yellow, obsoletely tinged with rose. 



Adams and Keeve, ZooI. Voy. Samarang, Moll. p. 74. 

 pi. 31. f. 14. 



Ilab. Shores of Borneo. 



A thin transparent flatly compressed shell, rayed with 

 numerous fine scabrous-scaled ridges. 



Species 139. (Fig. «, i, Mus. Cuming.) 



Pecten fucatus. Feet, testa mborbiculari, tenuicidd, 

 subconvexd, aqnilaterali, teqiiivalvi, valvis eostis diio- 

 decim rotmidatis subiiodosis radiatis, eostis et prceci- 

 pue interstitiis prope marginem liratis ; alba, prope 

 marginem carmiued ant violaced ; auricidis intequa- 

 libiis. 



The dyed Pecten. Shell nearly orbicular, rather thin, 

 slightly convex, equilateral, equivalve, valves rayed 

 with twelve rounded subnodose ribs, ribs and espe- 

 cially the interstices ridged near the margin ; white, 

 carmine or violet near the margin ; ears unequal. 



Sab. West Indies. 



Of very simple character, but peculiarly distinct from 

 any other described species. 



Species 140. (Pig. a, b, Mus. Cuming.) 



Pecten Ctjmingii. Feet, testa orbiculari, compresso-cmi- 

 vexd, (equilaterali, subcequivalvi, valvis eostis rotuudatis 

 viginti regulariter radiatis, interstitiis subexcavatis, 

 siriis concentric'ts subtiUssime exsculptis ; albidd, vio- 

 laceo-fusco et aurautio interdtim rosea et vialaceo va- 

 riegatd ; auriculis grandibus, aqualibus, aut raseis 

 aut purpurea-fuscis, strigis albis acute undulatis stepe 

 notatis. 



Cuming's Pecten. Shell orbicular, compressly convex, 

 equilateral, nearly equivalve, valves regularly rayed 

 with twenty rounded ribs, the interstices being ex- 

 cavated and very finely sculptured with concentric 

 stria;; wlutish, variegated with violet-brown and 

 orange, sometimes with rose and violet only ; ears 

 large, equal, rose or purple-brown, often marked with 

 wliite zigzag streaks. 



Hub. Moreton Bay, Australia ; Strange. 



This fine new species is greatly distinguished for its 

 veiy rich and beautiful colouring. 



Species 141. (Mus. Cuming.) 



Pecten corneus. Feet, testd siibobliqite ovatd, sttbcorned, 

 convexd, inaquilaterali, subaquivalvi, valvis eostis plu- 

 rimis, lavibus, irregularibus, radiatis, interstitiis can- 

 centrice tenuistriatis ; pellucido-albd, eostis hie illic 

 fulvo-carneis ; auriculis subaqualibus. 



The horny Pecten. Shell rather obliquely ovate, rather 

 homy, convex, inequilateral, nearly equivalve, valves 

 rayed with numerous smooth irregular ribs, inter- 

 stices concentrically finely striated ; transparent- 

 white, ribs here and there fulvous-homy ; ears nearly 

 equal. 



SowERBY, Thesaurus Conch, vol. i. p. 71. pi. 13. f. 44 

 and 45, and pi. 30. f. 344 and 245. 



Hub. Straits of MagaDiaens. 



Approximating to the type represented by F. Fatagoni- 

 cHs, from the same locality. 



June, 1853. 



