— 2G — 



P. audouini, Payr. ? 



P. pesfelis, L. Not comtnon. 



P. varius, L. Very coinmon. 



All tho pecfcens attach themselve3 to objects by threads, 

 except P. jacobceus, and all arc eateu as food. 

 P. bruei, Peyr. 



Pectinea fossiles. 



P. pandora, Desh. ; found in the coralline Hmestone. (T. 



Wright). 

 P. squamulosus, Desh. ; found in Bcd No. 1, tlie coralline 



limestone, and in Beu No. 2, the yellow sand. (T. 



Wright). 

 P. burdigalensis, Desh ; found in the coralline limestone, in 



the yellow sand, and in Bed No. 4, the calcareous sand- 



stone. (T. Wright). 

 P. beaudautii '?; fouud in the coralline limestone. (E. Forbes), 

 P. scabrellus '? , Lamk ; found in the corailiue limestone. (E. 



Forbes). 

 P. cristatus, Bronu. ; found in the yellow saud, on the eastern 



shore of Fort Bicasoli. (Mamo). 

 P. nodulosus, Calcara ; found in the yellow sand ? (Mamo). 

 P. laticosta; found in the calcareous sandstone. (T. Wright). 

 And three other species, not perfectly known, in the yellow 



sand ; iu Bed No. 3, the clay bcd ; and in Bed No. 5, 



the hard cherty limestone. (T. Wright). 



Gcnus Spondylus, Lamk. 



S. gtederopus, L. Maltese namo Galdra. Very common, 



and offers many varieties. 

 S. aculeatus?, Chemnitz. A variety of the prcceding ? 



Spondyli fnssilca. 

 S. quinquecostatus, Desh. ; identical with the Greek species. 

 Found in Bed No. 1, the coralliue limestonc. (T« 

 Wright). 



