Obthis. 



522 



Orthis leucosia, Hall. 13th An. Rt. 1860; Pal. N. Y. Vol, 



SfNt. 



*» 



4, 1867, page 48, plate 7, fig. 4 «, ventral valve of small speci- 

 men; 4 (?, dorsal, <f, ventral, c^ profile, rf, hinge, of large npeci- 

 men \^ g^h^ interiors of dorsal and ventral valves ; 4 i, cast of a 

 ventral valve. Allied to 0. vanuxemi, Hamilton. — In Pennsyl- 

 vania collections are specimens 809-8, -9, -11 ? from Ding- 

 man's Falls, Pike Co., from Hamilton rocks. — 877-1, McKean 

 Co. from Chemung. — 9520, and 9525 (of various sizes) in Ran- 

 dall's collections at Warren, Pa. (wrongly labelled Orthis mi- 

 chelini) from Upper Chemung ov Chemung Catski II., VIII do 

 VIII-IX. : 



Orthis leucosia, Var. pennsylvanica, new variety, S. B. 

 Simpson. See O. pennsylvanica. This is founded on speci- 

 mens 555-45,-47, from Sullivan township, and 856-28, Clymer 

 township, Tioga Co., Pa., all from Chemung., VIII g, — 865-1, 

 Dewees' collections in Mahanoy Valley, Perry Co., from bot- 

 tom bench of Upper Hamilton fossil ore hed., VIII g. — 878-1 

 (three examples). Hick's Coll. in McKean Co. Chemung., VIII 

 ^._882-2 (three) ditto.— 9524, 9542, Randall's Coll. at Warren, 

 Pa. Upper Chemung., VIII-IX. 



Orthis limitaris. See Leiorhynchus limitaris. Add to 

 what is stated on page 306 above, that it has been recognized 

 in Huntingdon, Blair and Centre counties. Pa. in Marcellus 

 Mack shale. T, p. 33 ; T 4, p. 432.— VIII h. 



