Species of the Chemung Group. 105 



aspect, has been found by D. D. Luthkr in the lower Chemung beds at Italy 

 hollow, Yates county. 



Hydnocekas hypastrttm, sp. nov. 



Plate tii, Fig. 1. 



Among the specimens obtained from the late Rev. Jonathan Allen, 

 of Alfred, is one showing in cross-section a cup with a cii'cular or subcylindrical 

 body and eight very strong nodes in four pairs. Each pair is raised on an 

 elevated base as in H. hotroedema. These nodes are very long and droop 

 toward the base of the cup. Though the summits of all are broken, sufficient 

 is retained to indicate their great size and length. The greatest diameter of 

 the specimen between the broken extremities of the nodes is 1 30 mm. ; the 

 diameter of the cylindrical body, 57 mm. Though the fragment indicates a 

 form similar to II. hotrcedema, the nodes are proportionally larger and the cup 

 itself of much greater size than in that species. It is probable that when 

 better known this form will prove to be distinct from the others here 

 enumerated. 



Locality. In the Chemung group ; from a greenish sandstone in associa- 

 tion with Cryptodwtya Alleni ; probably from the lower part of the series in 

 Steuben county, N. Y, 



Hydnoceras eutheles, sp. nov. 



Plate viii, Figs. 5, 6 ; see also Plate xxxiii, Fig. 7. 



This form, which is represented by two very similar fragments from the 

 same locality, combines in a certain measure the form of II. Batlien.^ with the 

 pendulous nodes of II. hotroedema. The sponges are short, expand rather 

 rapidly and show obscure evidence of the prismatic faces ; the horizontal rows 

 of nodes were probably not more than four in number ; the nodes themselves 

 are extremely long, somewhat compressed laterally, the outline being incom- 

 plete at their extremities, thus indicating a strong spicular tuft at these points. 

 In the elongate form of the nodes the species is even more extreme than H. 

 hotroedema, while it lacks the subcylindrical body and slender form of the 

 latter. 



Birrmisions. The better of the two examples has a length of 80 mm. 

 from the aperture to the end of the third horizontal row of nodes, which could 

 not have been far from the base of the cup. Its diameter at the aperture is 90 

 mm. ; between the two lower rows of nodes, 38 mm. One of the nodes has a 

 length of 25 ram. 



