PECTEN.— Plate XX. 



et viginti radiatd; albidd, nigro lentiginosd, umbonibus 

 pnrpureo-rufa, intus Uvido-fumea ; auriculis incBqua- 

 lihm. 



The ' FRECKLED Pecten. Shell somewhat triangular-ob- 

 long, higher than long, rather compressed, nearly 

 equDateral, equivalve, rayed with about twenty-two 

 foliaceous-scaled angular ridges ; whitish, freckled 

 with black, umboes purple-red, interior of a livid 

 smoky hue ; ears unequal. 



Hah. Island of Ticao, Philippines (under stones at low 

 water); Cuming. 



This is the shell figured and described by Mr. Sowerby 

 as a variety of P. sanguineus, but it differs from that species 

 in the following important particulars. The posterior ears 

 are less obliquely shortened, and the ribs are less nume- 

 rous, while they are angled and foliaceous-scaled. 



Species 77. (Mus. Cuming.) 



Pecten tigkis. Pect. testa oblique subtrigond, tenuiculd, 

 ineequilaterali, vix cequivalvd, valvd dextrd convexiore ; 

 decemcostatd, costis interstitiisque midique radiatim 

 liratis et subtilissime granulatis ; croceo-albd, valvd 

 sinistrd ru/o-nigro concentrice undato-strigatd, dextrd 

 sparsim maculatd, umbonibus croceis ; auriculis valde 

 incequalibus. 



The tiger Pecten. Shell obliquely subtriangular, rather 

 thin, inequilateral, scarcely equivalve, the right valve 

 being more convex, ten-ribbed ; ribs and interstices 



radiately ridged and very finely granulated through- 

 out ; yellow-white, left valve concentrically wave- 

 streaked with red-black, right valve sparingly spotted, 

 imiboes yellow ; ears unequal. 



Lamarck, Anim. sans vert. (Deshayes' edit.)vol.vii. p. 141. 



Hab. Philippine Islands ; Cuming. 



The yellow colouring which characterizes this species is 

 more or less strongly stained through into the interior. 



Species 78. (Mus. Cuming.) 



Pecten prunum. Pect. testd subarbiculari, subcompressd, 

 mquilaterali, cequivalvd, costis liratis octodecim, undi- 

 quepulc/ierrime/oliaceo-squamatis, radiatd; purpuras- 

 cente-carned, alba hie illic sparsim lentiginosd ; auri- 

 culis inaqualibus, nitide et profuse squamatis. 



The plum-coloured Pecten. Shell nearly orbicular, 

 rather compressed, equilateral, equivalve, rayed with 

 eighteen ridged ribs, which are very beautifully folia- 

 ceous-scaled throughout ; purplish-flesh, sparingly 

 freckled here and there with white; ears unequal, 

 neatly and profusely scaled. 



Hab. Moreton Bay, Australia ; Strange. 



A very elaborately sculptured species, allied to P. as- 

 perrimus, from which it differs chiefly in the ribs being 

 broader and more rounded, more highly scaled, and fewer 

 in number. It is delicately tinged throughout with a 

 plum -like bloom. 



