4:68 Thirty-fifth Eeport on the State Museum, 



DESCRIPTION OF SPECIES. 

 Oyathophycus reticulatus. 



Plate 18, Fig. 1. 



Cyathophycus reticulatus, Walcott. Trans. Albany Inst., x, p. 18 pi 2 fio-s 



16 a-d. 1879. .. ' b " 



Cup elongate turbinate, hollow ; length about three times the di- 

 ameter ; gradually enlarging from the initial point to near the sum- 

 mit, whence the tube is gradually contracted to the aperture. Base 

 attenuate. 



Structure reticulate. Surface usually entire, sometimes showing a 

 low elevation of the surface or an obscure node in each large quadrule. 



An ordinary specimen has a length of 95 mm., with a diameter of 

 28 mm. in its compressed condition. 



Formation and locality. In the Utica slate ; Holland Patent, 

 Oneida county, N. Y. 



Cyathophycus subsphericus. 



Cyathophycus subsphericus, Walcott. Trans. Albany Inst., vol. x, p. 19, pi. 2, 



fig. 17. 1879. 



The original description of this species is as follows : " Hollow 

 membraneous fronds with a circular opening at the apex of a nearly 

 hemispheric body." 



" This species is less firm in structure than the preceding, there 

 being no thickening of the cell walls to give the reticulated appear- 

 ance and to preserve the form, which varies from circular to oval, as 

 if a hemispheric body had been pressed flat. In an example three 

 centimetres in diameter ; the circular opening is nine millimetres in 

 diameter." 



Formation and locality. Utica slate ; town of Trenton, Oneida 

 county, N". Y. 



Dictyophyton" Hamiltonense, n. sp. 



Cup broadly cyathiform, expanding rapidly from an obtuse base ; 

 length and breadth, in the specimen as preserved, about equal. Base 

 broad and irregularly nodose with fascicles of spicules extending 

 downward, forming media for attachment. 



Surface very coarsely reticulate with strong nodose radiating and 

 concentric elevated ridges. Intermediate spaces very finely reticulate, 

 and ornamented by irregular nodes or nodose ridges. 



The specimen, which is imperfect in the upper part, has a length 

 of 95 mm., with an equal diameter in its compressed state. 



Formation and, locality. In the shales of the Hamilton group ; 

 shore of Canandaigua lake, N. Y. 



