70 DlCTTOSPONOID^E. 



DimeTisions. One of the specimens, somewhat distorted, has a length of 

 100 mm. The fragment of a large cup indicates an apertural width of 

 150 mm, and its original length was probably not less than 250 mm. 



Localities. The first specimen found was taken from the Portage sand- 

 stone at the second falls of the Tannery gully, Naples ; subsequently, the 

 species was obtained at Varysburg, Wyoming county, in the ravine entering 

 the village from the west. The latter horizon is considerably lower in the 

 rock series than the former. (Collected by D. D. Luther.) 



Hydnoceras eutiieles (?). 



Plate xxxiii, Fig. 7. 



(See page 105 and Plate viii. Figs. 5, 6.) 



This species, characterized by its short form and long, pendant nodes, is 

 described among the Chemung forms obtained at Cotton hill, near Avoca. A 

 specimen from the Portage beds found in association with the preceding 

 species, has an aspect so similar to H. euthehs, as to make probable the 

 specific identity of the two. It is, therefore, for the present referred to that 

 form. (Collected by D. D. Luther.) 



HyDNOCERAS GRACILE, Sp. nOV. 

 Plate xxxiii. Figs. 3, 4. 



Sponge short, rapidly expanding, with three rows of nodes exposed, 

 possibly a fourth near the base which is fractured. In two of these horizontal 

 rows the number of nodes is normal, eight ; but in the outer or apertural row 

 some of the nodes are absent or but faintly developed. The apertural margin 

 is retained in its entirety and while the absence of some of the nodes near this 

 edge is noticeable and in accordance with the structure observed in other 

 species, yet the nodes of this outer row are close to the margin, and not sepa- 

 rated from it by any considerable area. The nodes of the upper row are low 

 but those of the lower rows long and slender. 



The reticulum is very fine, the primary subdivision being largely obscured 

 and evidence of prismatic faces wanting. The two specimens which represent 

 this species are similarly preserved, having been buried in the sediment with- 

 out lateral compression. In their dimensions and individual characters they 

 are very similar, though one is more favorably preserved than the other. Each 

 has an apertural diameter of 50 mm., and their height is about 30 mm. Both 

 of these dimensions have been somewhat modified by the slight compression 



