HUDSON RIVER BEDS NEAR ALBANY 569 



DESCRIPTIONS OF NEW FOSSILS FOUND IN THE 



DESCRIBED SHALES 



§ 1 BRACHIOPCyDA 



With the exception of a few brachiopods no fossils which could 

 assist in establishing the age of the Normans kill shales have 

 been found associated with the graptolites. These are small 

 chitinous shells which, being invariably strongly exfoliated and 

 macerated^ have so far not admitted of identification, and are, in 

 the literature, usually mentioned as " oboloid shells". Bishop 

 (33) speaks of several species of Lingulops. 



The shales of Mt Moreno near Hudson have furnished small 

 accumulations of such shells, which, similar to the accumulations 

 of specimens of Leptobolus insignis in the Utica shale, 

 appear to have been caused by drifting. Some of these valves 

 have proved to be so well preserved that they deserve notice. 

 Three different forms have been made out. 



1 Paterula amii, Schuchert. Synopsis Amer. foss. Brach., 

 bul. U. S. geol. sur. 87: 301 



Paterula (?) sp.. Hall and Clarke. Pal. N. Y. 1892. v. 8, 

 pt 1, pi. 4, fig.' 1 {see pi. 1, fig. 2) 



This is one of the more common forms in the shale. It is char- 

 acterized by its oval outline, broad marginal border, narrow, 

 marginal pedicle fissure, radiating muscular impressions, and its 

 rather strong, lustrous and well preserved shells. 



The dimensions of the figured specimen were 3 mm (length) 

 and 2.5 mm (width). 



As the specimens which were sent to Professors Hall and 

 Clarke by Mr Ami came from the beds of the city of Quebec, 

 which contain the same graptolite fauna as the shales of Mt 

 Moreno, it is very probable that the forms from the two localities 

 are Identical. 



2 L e p t b 1 u s w a 1 c o 1 1 i sp. n. {see pi. 1, fig. 6-12) 



The most common brachiopod is a larger shell of subcircular 

 outline, as usually preserved, very slightly convex and provided 



