10 PALJBONTOLOOT OF NEW-YOEK. 



Fig. I. View of the upper side of a large specimen. 



Fig. 1 a. The lower side of a smaller specimen, showing the broad umbilicus. 



I regfard this species as exceedingly interesting, and as linking by a generic type ( very 

 rare in the lower rocks of this country) the Ibwer, middle, and upper palaeozoic strata. 

 Mr. Mdbchison records three species as occurring in the Llandeilo flags, in England and 

 Wales ; but tliis is the first and only individual in our lower strata, which I feel warranted 

 in referring to the same genus. 



Position and locality. The specimens were found in a loose mass of the Calciferous rock, 

 in Saratoga county. The character of the mass, and its association, leave no doubt of the 

 true position of the fossil. (Cabinet of Ltmai* Wiujeb.) 



9. 1. MACLUREA SORDIDA (n. sp.). 



Pi.. III. Figs. 2, 2 a. 



Shell discoidal ; spire not elevated; mouth slightly expanded; surface apparently smooth.. 

 The specimens of this fossil usually appear in a weathered, worn and distorted condition, 



in the upper part of the rock. From their condition, it is not easy to determine their 



specific relations. 



From the circumstance that these fossils always present the oval form exhibited in the 



figures, Mr. Vanuxem has termed them Ellipsolites ; but a careful examination induces 



me to refer them to the Genus Maclujiea, typical specimens of which occut in the sue-. 



ceeding rock. (State Collectim.) 



10. 2. MACLUREA MATUTINA (n.*j».). 

 Pi. UI. Fig. 3. 



Discoidal, involute ; spire not elevated ; umbilicus deep ; surface unknown, apparently 

 •triatcd. 



The fossils in this specimen, as is the case with nearly all the others in this rock, are 

 obscure, both from the character of the rock, before alluded to, and from weathering, by 

 exposure. It is therefore with some hesitation that I characterize the two species above ; 

 but as they may be of some service to the student in identifying the mass, and as the fact 

 of their existence is also interesting, we offer them as they are usually seen. The rock in 

 which they occur is lithologically a compact silico-magnesian limestone, which weathers 

 with a greyish brown surface, and attains a coarse harsh structure. In the same rock are 

 oflcn seen a few fragments of Orthocerata, which, with the numerous individuals of the 

 two species here described, render some of the thin layers highly fossiliferous. 



Potition and locality. These fossils are usually found in the higher portions of the rock, 

 at Canajoharie, and other places in the Mohawk valley. 



