637 Pholid. 



this is always arguing in a circle. J. P. L.] — Hudson river 

 shale at Cincinnati, O. — III}), 



Pholidops hamiltonensis, (Hamiltonice, Hall, 1860, leSth 

 6 , An. Kt. Pal. N. Y. IV. p. 32, pi. 3, fig. 6. Hamil- 

 ton.) Olaypole's specimen 11,705 (5-66) from 

 Barnett's Mill, Perry Co., Pa. Hamilton upper 

 shales. VIII c. 



Pholidops oblata, Hall. Pal. N. Y. Vol. 4. p. 414, pi. 3, 

 fig. 10 (given with the figure of P. arenaria above). Hamil- 

 ton shales^ OnondL2ig2i Co., N. Y., VIII c — Note. Under P. 

 a^renaria., Hall calls it, however, a form of the Schoharie Orit. 

 VII 



Pholidops ovalis. Hall. From Collett's Indiana Report of 

 y6>-^i. ,. 1881, p. 284, pi. 21, fig. 1, 2, greatly enlarged., 

 upper valve, and profile of a specimen with both 

 valves. — Niagara^ Vh. 



iND.I8«l. Pl.zu 



Pholidops trentonensis, Hall, pamphlet 1866, Trenton 

 (S. A. Miller). Recognized by G. B. Simpson in spec. idlO-147 

 of Fellows' collections at Bellefonte, Centre Co., Pa., in Tren- 

 ton limestone^ II c. 



Pholidops squamSDformis, (Orhicula squamoeformis) . 

 V.^ Hall, p. 108, fig. 38, 1. (See Murch. Silurian Researches, 

 I). pi. xii, fig. 14 ^.) Niagara limestone^ Vh. 



SS, 



Phra^moceras ellipticum, Hall & Whitf. Pal. Ohio, Vol. 

 2, 1875, p. 152. pi. 8, fig. 11, view of the side of a cast, the 

 outer chamber showing the curvature of the septum, or fioor, 

 which separated it from the last of the internal chambers, and 

 also, the large siphuncle which connected the chambers, situ- 

 ated close to the inner side of the shell, which, judging from 

 this outer chamber, must have been of great size. Niagara 

 limestone.^ Highland Co., O., found in company with Trimerella 

 ohioensis. — Vh. 



Note. — For figure of P. ellipticum., see p. 638. 



