18 



Locality and Formation Anse au Loup on the north shore of the 

 Straits of Belle Isle, in limestone of the Potsdam group. 

 Collector. J. Richardson. 



SALTERELLA PULCHELLA. (N. sp.) 



Description. Elongate, conical, gently curved, six to eight lines in length 

 and from one line to one and a-half in width at the aperture. Surface 

 ornamented with small encircling striae just visible to the naked eye. 



This species is larger than 8. rugosa, always a little curved, not so 

 abundant, and when weathered does not present the sharp imbricating 

 annulatioris of that species. 



Locality and Formation. Same as 8. rugosa, but apparently not in 

 the same bed, as the two species are not found together in the same frag- 

 ments of rock. 



SALTERELLA OBTUSA. (N. sp.) 



Description. Six to eight lines in length ; diameter at aperture about 

 three lines. The transverse section is always sub-triangular, and in some 

 of the specimens one side appears to be flat like a Theca, and I would refer 

 it to that genus only that the tube is composed of successive layers. 

 None of the specimens are perfect, but the form is sufficiently different 

 from that of the other two to indicate a distinct species. 



Locality and Formation. Same as the preceding, but not associated 

 with 8. rugosa, although it occurs in the same fragments of rock with 

 S. pidchella. 



2. On some new species of Fossils from the Calciferous Cliazy, Black 

 River, and Trenton Formations. 



Genus EOSPONGIA. (N. gen.) 



ASTYLOSPONGIA (pars). (Roerner). Die Silurische Fauna des Westlichen Tennessee, 

 p. 7, 1860. 



G-eneric characters. Sub-globular, pyriform or sub-hemispherical 

 sponges, not free, with an internal arrangement of pores (sometimes reti- 

 culated), radiating irregularly from the central axis ; cup of variable 

 depth. 



Dr. Ferdinand Roemer, in his beautiful work on the Silurian Fauna of 

 Western Tennessee, has described three genera of Silurian sponges, 

 Astylospongia, Palceomanon, and Astroeospongia. The first of these, he 

 says, consists of free sponges ; hence the generic name. We have several 



