Speciks op thk Cmkmitnc} Group. 109 



Locality. From the lower beds of the Chemung group, not more than 

 one hundred feet above the Portage sandstones, at Deyo basin in the southern 

 part of the town of Naples, N. Y. 



Associated with it are Ceratodietya annnkita, Spirifer mesacoHtalis, 

 Atrypa hystricc, ProdwtelUiU;liryitwm, Amhocidm umboiuiUt, Ilystracanthua, 

 sp., etc. (Collected by D. D. Luthek.) 



HTDNOCJiRAS NODOSUM, Hall (sp.). 

 Platk ii, Fio. 2. 



1863. Dictyophyton nodosum, Hall. Sixteenth Ann. Kept. N. Y. State Cab. 



Nat. Hist., p. 91, pi. iii, fig. 2. 

 1884. Dictyophyton nodosum, Hall. Thirty-fifth Ann. Rept. N. Y. State 



Mus. Nat. Hist., p. 472, pi. 17 (18), fig. 6. 



"A fragment two and a half inches in length, being an impression in shaly 

 sandstone, preserves the marks of longitudinal ranges of rounded nodes there 

 being six [five] nodes in each longitudinal row in the length indicated. 



"This species differs from the preceding [^ tuberosum] in having longi- 

 tudinal rows of nodes more nearly parallel, smaller and more clearly arranged 

 in rows, while they are not angular. The surface is finely reticulated by 

 longitudinal and transverse striae. 



"Geoloijical formation and locality. In the shaly sandstones of the 

 Chemung group in Cattaraugus county (N. Y.)." (op. cit. 1863.) 



This is a small species which appears to have some resemblance to H. 

 hotrosdemxi in its slender cup and strong nodes though possessing one more 

 horizontal row of nodes than any examples of the latter species have yet shown. 

 Nothing closely comparable to the original specimen has been observed, and 

 hence our knowledge of the specific form is still quite imperfect. 



Hydnoceras anthraois, sp. nov. 



Plate ii, Fig. 8; Plate vi, Figs. 1, 2; Plate xxxiii, Figs. 8, 9. 



Sponoe small, narrow and gracefully expanding for one-third of its length, 

 thence upward gently contracting to a well-defined constriction just below the 

 aperture. 



Surface sharply prismatic for nearly one-half the length of the cup. Not 

 until the sponge attains its full diameter do nodes appear and these manifest 

 themselves with some irregularity. In the single entire specimen observed 



