639 



Fhrag. 



Phragmoceras parvum, H. & W. Pal. Ohio, Vol. 2, 1875, 

 l/iftP*5^9s^?ie5^:sssBefe*.. p. 151, pi. 8, fig. 10, side view of a specimen 



from the upper limestone beds of the 

 Niagara formation^ at Cedarville, Greene 

 Co., O., differing from any other species of 

 Phragmoceras in its smallness, general 

 . form, and rapid curvature, combined with 



JCi 1 pi-otruding tube-like process at the ventral 

 end of the aperture. — Vh. 



Phthanocerus occidentalis, Scudder. A cockroach from 



upper carioniferous heds^ Kansas 

 City, Mo. Proc. Post. S. N. H. 

 Vol. 21, 1882, p. 58, in the Lacoe 

 collection at Pittston, Pa. — 

 957 Figure borrowed itom ZittePs 

 Handbuch, fig. 957 (magnified three times). — XV. 



Phthonia — 

 E. Hall, M8. 

 VII I- IX. 



? In Carll's collections, reported by C. 



Report Dec. 30, 1876. Chemung- C at shill^ 



Phyllograptus angustifolius, Hall. Geology of Canada, 



1863, p. 228, fig. 237, 

 natural size of this 





G.C. 



leaf- shaped grapto- 

 lite. (On the same 

 cut is given a group 

 of Phyllograptus 

 typus^ Hall's figures 

 of which are given 

 under that name 

 following.) Both 

 species are referred 



in Logan's book to the Quebec group of strata, formerly re- 

 garded as Zoii?^/' Silurian ( Siluro-camhrian^ or Ordovician)^ 

 but now known to be composed of formations, conformable and 

 unconformable, of Precamhrian^ Cambrian and Camiro- Silu- 

 rian ages, up to Trenton and Utiva. See Walcott's review of 

 EUs's Report, in Am. Jour. Sc. for Feb. 1890, p. 104 onward. — 

 Sillary SS, C. 



