PECTEN. 



Plate XXI. 



Species 79. (Mus. Cuming.) 



Pecten iMBRlCATtls. Pect. testd mbtrigono-ovata, sub- 

 arjuilaferali, auriculis valde iuaqwalibits, inaquivalvi, 

 valvd dextrd convexiore, valvis ambahis novemcostatis, 

 coslis siibaiiffusiis, tubercidis peculiariter globoso-forni- 

 catis ornatis ; opaco-albd, valvd sinistrd maculis per- 

 paucis intense roseis ornatd, valvarum facie interna 

 croced, prope marginem violaced. 



The imbricated Pecten. Shell somewhat triangularly 

 ovate, nearly equilateral, ears very unequal, iuequi- 

 valve, right valve more convex, both valves nine- 

 ribbed, ribs rather narrow, ornamented with pecu- 

 liarly globosely-arched tubercles ; opake-white, left 

 valve ornamented with a few deep rose spots, in- 

 terior of the valves saffron-yellow, violet towards the 

 margin. 



Ostrea imbricata, Gmelin, Syst. Nat. p. 3318. 

 An eadem ? Ostrea sauciata, Gmelin. 



Sab. Eed Sea. 



Eemarkably characterized by the swollen vaulted scales 

 gracefully drooping over towards the margin. 



Species 80. (Fig. a, b, Mus. Cuming.) 



Pecten Layardi. Feet, testd suborliculari, auriculis in- 

 aqualibus, obliquis, rtqitilaterali, siibaqulvalvi, valvd 

 sinistrd snbconvex'wre, valvis costis duabus et viginti, 

 ad latera subsquamatis, radiatis ; croced ant violaced, 

 saturate hie illic marmoratd. 



IjAYARd's Pecten. Shell nearly orbicular, ears unequal, 

 oblique, equUateral, nearly equivalve, left valve rather 

 the more convex, valves rayed with twenty-two ribs 

 a little squamate at the sides ; saffron-yeUow or vio- 

 let, marbled here and there darker. 



Hab. Ceylon ; Layard. 



An interesting new species, brought from Ceylon by 

 Mr. Layard, after whom, at the request of Mr. Cuming, 

 I have the honour to name it. 



Species 81. (Mus. Cuming.) 



Pecten senatoeius. Pect. testd orbicularis subdepressd, 

 aquilaterali, subaquivalvi, valvd dextrd subpland, val- 



vis costis viginti ad quatuor et viginti obtuse serratis 

 confertis radiatis; miniaceo-rufd, albo nigro-nebulato 

 hie illic marmoratd ; auriculis incequalibiis. 



The senator's Pecten. Shell orbicular, somewhat de- 

 pressed, equUateral, nearly equivalve, right valve 

 rather flat, valves rayed by twenty to twenty-four 

 close-set obtusely-serrated ribs ; vermilion-red, mar- 

 bled here and there with black-clouded wliite ; ears 

 unequal. 



Ostrea senatoria, Gmelin, Syst. Nat. p. 3337. 

 Ostrea porphjrea, Gmelin. 

 Pallium porphyreum, Chemnitz. 



Hab. Moluccas, etc. 



A richly coloured species, of simple character and ex- 

 tremely symmetrical growth. 



Species 65. (Fig. c, Mus. Cuming.) 



A richly coloured orange variety of P. squamosns, re- 

 fen-ed to at PI. XVIII. 



Species 83. (Mus. Cuming.) 



Pecten squamatus. Pect. t^std subtrigono-orbieulari, 

 tenui, irregulari, inaquilaterali, subaquivalvi, com- 

 pressd, valvis costis septem aut pluribus, distarder 

 squamatis, radiatd, coatarum interstitiis plus minus 

 lat is, obscure liratis ; aliidd,fuscescente-carneo tinctd ; 

 auriculis subaqualibus. 



The squamate Pecten. Shell somewhat triangularly 

 orbicular, thin, irregular, inequilateral, nearly equi- 

 valve, compressed, valves rayed with seven or more 

 distantly scaled ribs, interstices between the ribs 

 more or less broad, obscurely ridged ; whitish, 

 stained with light brown-flesh ; ears nearly equal. 



Ostrea squamata, Gmeliu, Syst. Nat. p. 3339. 



Hah. St. Nicolas, Island of Zebu, Philippines ; Cuming. 



The growth of this species is very irregular, the ridges 

 in the under valve being partially developed here and 

 there into scaled ribs. 



Species 83. (Mus. Cuming.) 

 Pecten radula. Feci, testd subtrigono-ovatd, altiore 



May, 1853. 



