126 



PALAEONTOLOGY OF NEW-VOKK. 



Position and locality. In the Niagara limestone at Niagara Falls, Lockport, Rochester and 

 elsewhere ; and has been sent to me by Mr. I. A. Lapham, from the same geological position, 

 from Milwaiikie, Wisconsin. ^^tate CoiUctlun.) 



516. 2. FAVOSITES FAVOSA? 



PL. XXXIV A. Fig. 5 a- 6. 

 Reference Calamopora favosa, Goldfuss, Petrefacta, p. 77, pi. xxvi, tig. 2 a, b, c. 

 Compare Favositea striata, Say, Silliman's Am. Journal of Science, Vol. i, p. 381, 1818. 



Massive, hemispheric ; tubes large, strong, prismatic, sometimes striated transversely ; trans- 

 verse septa numerous, sometimes convex above ; base and sides of the mass covered by a thick 

 calcareous membrane, which is strongly striated concentrically, and corrugated. 



This species is remarkable for its large strong columns, which diverge rapidly from the base, 

 and admit numerous interstitial ones. The septa are closely arranged, very strong, and some- 

 times present the convexity in the centre noticed by Goldfuss, though this is far from being a 

 uniform character in the specimens we possess. 



I have preferred to refer this species to the F. favosa., more particularly since the species 

 described by Goldfuss is from Drummond island, which is of the same geological formation 

 as the rocks at Milwaukie. The specimens which I have examined are not in a favorable condi- 

 tion for preserving the more minute markings ; and therefore it is not easy to decide with 

 regard to its identity with other species. 



It seems probable that the F. striata of Say includes several species, as the specimens cited 

 are from different localities and geological positions. 



Fig. 5 a. A longitudinal section of a small hemispherical mass. 



Fig. 5 b. Section of another specimen, where the septa are more distant and irregular. 



Fig. 5 c. The solid columns of the same species. The nature of the semicrystalline calcareous 



matter replacing these is such that the pores are very indistinctly preserved. 

 Fig. 5 d. Transverse section of the cells. 

 Fio-. 5 e. An impression left by the exterior surface of one of these masses. 



Position and locality. In the Niagara limestone at Milwaukie, and (as I am informed) 

 in Canada West. I have not, thus far, found this species in the State of New-York. 



{State Collection.) 



