PECTEN. 



Plate XVII. 



Species 62. (Mus. Cuming.) 



Pecten Daewinii. Fed. testa orbiculari, tenuiculd, 

 (sqiiivalvi, cBquilaterali , sexdec'micostatd, costis suban- 

 giistis, usque ad midmies distinctis, versus martjinem 

 obsolete obtuse tenue lirato-squamatis, intersfitiis ob- 

 soletius lirato-squamatis ; rosaceo-albidd, liris versus 

 marffiiiem purjiurasceute-roseis ; auriculis grandibus, 

 subaqualibus. 



Darwin's Pecten. Shell orbicular, rather thin, cqui- 

 valve, equilateral, sixteeu-ribbed, ribs rather narrow, 

 distinctly formed to the umboes, obsoletely obtusely 

 finely scale-ridged towards the margin, interstices 

 more obsoletely scale-ridged ; pink-white, ridges pur- 

 ple-rose towards the margin ; ears large, nearly equal. 



Kab. Santa Cruz, Patagonia; Darwin. 



A characteristic species, collected some years ago, at the 

 above-named locality, by Mr. Darwin, but not hitherto 

 described. 



Species 63. (Fig. a, b, c, Mus. Cuming.) 



Pecten pallium. Pect. testa orbiculari, esquivalvi, sub- 

 aquilaterali, crassiusculd, compressd, costis duodecim 



ad quatuordecim radiatd, costis iripartitis, densissime 



et piilcherrime imbricato-squamatis, squamis plus minus 

 lamellatis, erectis ; costarum interstitiis squamato-lira- 

 tis ; intense aurantio-miniaced, violaced, aut purpureo- 

 rufd, alba plus minus concentrice undato-strigatd, intus 

 alba, marginem versus colore iinctd; auriculis incequa- 

 libus, verrucoso-squamatis. 



The mantle Pecten. SheU orbicidar, cquivalve, nearly 

 equilateral, rather thick, compressed, rayed with 

 twelve to foui'teen ribs, which are tripartite, and very 

 densely and beautifully imbricately scaled, the scales 

 being more or less lameUated and erect ; interstices 

 between the ribs scale-ridged ; deep orange-vermilion, 

 or violet, or pm'ple-red, more or less checkered with 

 white concentric wave-streaks, interior white, more 

 or less stained with colour towards the margin ; ears 

 unequal, wart-like squamate. 



Ostrea pallium, Linnseus, Syst. Nat. (12th edit.) p. 1145. 

 Pecten pallium. , Lamarck. 



Hab. Pacific and Eastern Seas. 



The brilliant orange -vermilion specimen here figured 

 was collected by Mi-. Cuming at Lord Hood's Island, the 

 violet specimen at the Mauritius, and the pm'ple-red at 

 the Philippine Islands. 



April, 1863. 



