38 EOCENE MOLLUSCA. 



1. Pecten bellicostatus, S. Wood. Tab. VIII, fig. 11, a, b. 



Spec. Char. Testa crassd, csquivalvi, orbiculari vel lenticulari, aquilaterali, costatd; 

 costis 20-24 sub-rotundis, striatis et imbricatis ; interstitiis lineatis et imbricatis ; 

 auriculis magnis, inaqualibus. 



Shell thick and strong, equivalved, orbicular or lenticular, equilateral, costated ; ribs 

 20 to 24 somewhat rounded, striated, and strongly imbricated ; interspaces also with 

 imbricated rays : auricles large and unequal, one costated, the other striated. 



Diameter, l|ths of an inch. 



Locality. — Brockenhurst {Edioards). 



Our shell is a handsome one and highly ornamented, and, judging from the number 

 of specimens in Mr. Edwards' cabinet, it does not appear to have been scarce. In addition 

 to the above formula, it may be further noticed, that the centre of the elevated rib is not 

 only strongly and regularly imbricated, but the imbrices are long, overlapping, and 

 slightly projecting ; they are not reflexed, but lie over each other like ornamental tiling ; 

 there is a smaller ray on each side of the centre one, which is also imbricated, and the two 

 lines or rays on the interspaces are likewise covered with small imbrications. The auricle 

 on the pedal side of the right valve is a very large one, and ornamented with about half a 

 dozen costse, while the other is only striated with numerous rays ; and the ears of the left 

 valve are both striated ; angle of divergence, 90°. The nearest approach to this species is P. 

 T/torenti, D'Archiac, Tr. Geol. Soc. Fr., 2d ser., t. xi, pt. 1, p. 211, pi. 8, figs. 8, S, a,b, 

 which much resembles it in the ornament, but the auricle of that shell is so much 

 smaller that I must presume the two to be different. The figure there taken was from a 

 solitary specimen, and the auricle, if natural, does not appear to me to be perfect. 



2. Pecten carinatus, /. Soioerby. Tab. IX, fig. 5, a, b. 



Pecten carinatus. J. Sowerby. Min. Conch., t. 575, 1828. 



— — Prestwich. Journ. Geol. Soc, 1847, p. 405. 



— — Morris. Cat. Brit. Foss., p. 178, 1854. 



Spec. Char. P. testa orbiculari, lenticulari, aqaivalvi, aquilaterali, costatd; costis 

 {circa 20) subcequalibus, rotundatis, in medio carinatis ; interstitiis lavibus ; auriculis 

 sitbaqualibus. 



Shell orbicular, lenticular, equivalved, equilateral, costated; ribs about 20, nearly 

 equal, rounded, with a sharp keel along the centre of each ; interspaces generally naked, 

 or only marked with fine lines of growth ; auricles nearly equal. 



Diameter, 1 inch. 



Locality. — Barton. 



