PECTEN.— Plate I. 



Species 5. (Mus. Cuming.) 



Pecten LATIAURITUS. Fed. testa subcequivalvi, oMigne 

 subquadratd, inaquilaterali, tenui, pelluddo-corned, 

 pallide ferrugineo-fuscescente, maculis angulatis alhis 

 plus minus variegatd, concentrice sulcato-striatd, costis 

 obtuse rotundatis snbirregularibus ad duodecim ob- 

 lique radiatd. 



The broad-eaked Pecten. Shell nearly equivalve, ob- 

 liquely subquadrate, inequilateral, thin, transparent- 

 horny, pale rust-brown, more or less variegated with 

 white angular spots, concentrically groove-striated, 

 obliquely rayed with about twelve somewhat irregular 

 obtusely rounded ribs. 



Conrad, Sowerby, Thesaurus Conch, vol. i. p. 57. 



Hab. California. 



Of a peculiar thin horny substance, rayed in an oblique 

 direction with about a dozen incompletely developed ribs, 

 mottled with white upon a rust-tinged or bronze ground. 



Species 6. (Fig. 2 b, Mus. Cuming.) 



Pecten leucoph^us. Fed. testa suborbiculari, cequi- 

 valvi, aquilaterali, auriculis subcequalibus ; valvis con- 

 vexis, costis ododecim subangtdatis, striis elevatis ex 

 interstitiis nitide concentrice decussatis radiatis, costis 

 valveB dextrce latioribus, plus minus lavigatioribus ; ci- 

 nereo-grised, immaculatd, intus aid alba aid fused. 



The grey Pecten. Shell nearly orbicular, equivalve, 

 equilateral, ears nearly equal ; valves convex, rayed 

 with eighteen sub-angled ribs, neatly concentrically 

 decussated with raised stri;e out of the interstices, 

 ribs of the right valve broader and more or less 

 smoother; ash-grey, unspotted, brown or white 

 within. 



Hab. ? 



Of an uniform grey-slate colour without, and more or 

 less tinged with a light bronze-brown within. 



