P2GTEII {A20.UIPEGTBIT) SUlvIPLSUS n. sp. 



Peoten e xasre ratus Crupnj-, 18G6, luart. Jour. Geol. 3oc. london, 



vol. 32, p. 294 (non Sowerby, 1843). 

 Peotfin oxygonn.m "abo, 187r^, i'rans . Am, Philos. Doc, new ser., 



vol. 15, p. 256, (non Sowerby, 1850). 

 Peoten exasneratus Cupoy, 1874, Geol. Mag. Decade 2, vol. 1, p. 



443 (check list), ex -oarte, non Sar.-erb3", 1845. 

 Pecten oxyironiis Guppy,"1874, idem, (non Sowerby, 1850). 

 Pecten ox-;,g-oniim Guppy, 1875, Quart. Jour. Geol. Soc. Lonc^on, vol. 



32, p. 532, (non 3owerby, 1850). 

 Pecten ( Ae-ui-pe oten ] thetidis Dall, 1898, Trans, //agner ?ree Inst. 



3ci., Philadelphia, vol. 3, pt. 4, pp. 714-715, (non 



Sowerby, 1850). 

 Uot P. oxygonuDi Sowerbj', Dall, l.!98, idem, pp. 713-714. 

 Pecten ( Aeguipecten) ox yp: onijm Brown, 1913, Proc. Acad, i'at. 3c i., 



Philadelphia, vol. 5 5, p. 501. 



Description .- Shell of mefiium size, equilateral, except for 

 the aiiricles, subenui valve, both valves moderately convex, suborbi- 

 cular, v/ith the height and width virtiially equal; oixtline, exclus- 

 ive of the auricles, forming a sector of a-o-^roximately 90°; hi^ee 

 straight, about two- thirds of the vfidth of the shell; dorsal mar- 



