PECTEN. 



Plate XIV. 



Species 53. (Fig. a, b, Mus. Cuming.) 



Pecten Islandicus. Pect. testa, ovali, subaltiore ipiam 

 loncjd, iiuBqidlaterali, mbaquivalvi, nunc coynpresad, 

 nunc tumidimculd, liris numerosis sgwamulatis, inter- 

 dum prope marginem. dupUcatis, dense radkdd, inter- 

 dum obsolete rude costatd; valvd sinistra plus minus 

 intense purpurea vel fulvo-rubidd, dextrd pallidiore ; 

 auriculis valde inaqualibus. 



The Iceland Pecten. SheU oval, rather higher than 

 long, inequilateral, nearly equivalve, now compressed, 

 now rather swollen, thickly radiated with squamulate 

 ridges, which are sometimes duplicate near the mar- 

 gin, sometimes obsoletely rudely ribbed ; left valve 

 more or less deep purple or fulvous-red, right valve 

 paler ; auricles very unequal. 



Ostrea Islandica, MiiUer, Zoologia Danica, prod. No. 2990. 

 Pecten Islandicus, Chemnitz. 

 Ostrea cinnabarina, Born. 



Hab. Northern Seas. 



This well-known northern species varies extremely. 

 The specimen represented at Pig. 53 a, which is swollen 

 and ribbed, with the ridges rather sharply squamulate, is 

 from Greenland. That at Pig. 52 S, which is the more 

 common state of the species, is from Iceland. 



Species 53. (Pig. a, b, Mus. Ciuuing.) 



Pecten glaber. Pect. testa orbiculari, (Eqidlaterali, au- 

 riculis stdxjrundibus, aquivalvi, decemcostatd et striata, 

 costis subdistantibus, alterwis sape minus prominenti- 

 bus ; valvd sinistra cinered, nigra alboque variegatd, 

 aut luted, aut varid, dextrd pallidiore, umbonem versus 

 fusco-punctatd. 



The smooth Pecten. Shell orbicular, equilateral, auri- 

 cles rather large, equivalve, ten-ribbed and striated, 

 ribs rather distant, the alternate ribs often less pro- 

 minent ; left valve ash-colour, variegated with black 

 and wliite, or yellow, or various, right valve paler, 

 dotted with brown towards the umboes. 



Ostrea (jlabra, LinuEeus, Syst. Nat. p. 1146. 

 Pecten glaber, Chemnitz. 

 Pecten flavidulus, griseus, and virgo, Lamarck. 

 Ostrea citrina and rustica, PoU. 

 An varietates ? Ostrea lutea,flavescem, aurantia, modesta, 

 and depressa, Gmelin. 



Hab. Mediterranean. 



Extremely variable in colouring, but diflfering little in 

 sculpture, and not at all in form. 



February, 1853. 



