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PEG TEN (ASQ'JIPEOTSlO OZYGONUS Sowerby. 



Peotc-n oxygom^m Sowerbs?, 1850, QiLart. Jonr. Geol. Soc. Londor:, vol. 



6, p. 52. 

 Pecten aup-ttstioostatus Gabb, 1873, Trans, Am, Philos. Soc. (new 



ser. ) vol. 15, p. 256. 

 Pecten ( Aegiiipecten ) oxygonu-m Sowerby, Dall, 1898, Trans, "/agner 



Free Inst. 3ci., Philadelphia, vol. "^ , pt. 4, pp. 713-714. 

 I^ot P. OT^j-onxm aabb, 1873, Guppy, 1874, 1876, BroT.-n, 1915, (= P. 



snmpletis n. sp,). 



Desori'otion .- "Testa suborb ■ oialaris, subobliqua, tumida, 

 costellis radiantibus 19, superne acutangiilis, interstitiisaue 

 aeqiialibus lineis incrementi concinne decussatis; ai^.ribus inaequ^li- 

 bus, laevibus, radiatlm oostellatis, costellis tenuissirais." (Sow- 

 erby, 1850). 



Type locality ,- Santo Domingo, 



"Shell ST^iall, suborbicular, ■ ith nineteen to tv/enty-one sharp- 

 ly Keeled ribs separated by V-shaped interspaces, with little-ele- 

 vate-^, sharp, thin, concentric linear inbrication; form, tumid, 

 cardinal crura well marked; left valve less convex than the other. 

 Alt, ^nd lat, abont 15 mm," (Dall, 1 18, from type of P. august i- 

 Gostatus Gabb), 



