PECTEN 



Plate XV. 



Species 54. (Pig. a, b, c, Mus. Cuming.) 



Pecten operculaeis. Pect. testa orhiculari, aquila- 

 temli, snhcequwalvi, ventricosd, octocostatd et striata, 

 siriis inferdicm scabrosis, albkld ntfo varieyatd, aut 

 lutescente, aut intense purpiired, valm dextrd palli- 

 diore ; auriculis subaqunlibiis. 



The operculae Pecten. Shell orbicular, equilateral, 

 nearly equivalve, ventrieose, eight-ribbed and stri- 

 ated, strife sometimes scabrous, whitish, variegated 

 with red, or yellowish, or deep purple, right valve 

 paler ; amicles nearly equal. 



Ostrea opei-cidaris, Linufeus, Syst. Nat. (13th edit.) 

 p. 1147. 



Ostrea dubia, elegans, versicolor, radiata, and regia, 

 Gmelin. 



Eab. Seas of Europe. 



The thi-ee specimens here figured of this well-known 

 species represent the extreme variations of colour. 



Species 55. (Fig. a to d, Mus. Cuming.) 



Pecten proteus. Pect. testd subquadrato-orbiculari, 

 tenuiculd, ceqidlaterali, subaquivalvi, quinquecostatd et 

 striata, costis tumidiusculis, parum elevatis, remotis, 

 grised albo variegatd, aut luted, aut rufd, aut violaeed, 

 valvd dextrd pallidiore, fusco interdnm punctatd ; au- 

 riculis subaqualibns. 



The protean Pecten. Shell somewhat quadrately or- 

 bicular, rather thin, equilateral, nearly equivalve, 

 five-ribbed and striated, ribs rather swollen, but little 

 raised, distant, grey, variegated with white, or yel- 

 low, or red, or violet, right valve paler, sometimes 

 dotted with brown ; auricles nearly equal. 



SoLANDER, Sowerby, Thesaurus Conch, vol. i. p. 59. 

 Pecten discors, seu disconveniens, Chemnitz. 



Sab. Mediterranean. 



Though closely allied to P. glaber, these have neverthe- 

 less a distinctive character, especially in being thin and 

 only five-ribbed. 



February, 1853. 



