78 DlCTYOSPONGID^.. 



Hydriodictya patula, Hall. 



Plate iv, Fig. 1. 



1884. Diciyaphytoti patidum, Hall. Thirty-fifth Ann. Kept. N. Y. State Mus. 

 Nat. Hist., p. 469. 



Sponge, of which the upper portion only is known, broadly funnel-shaijed. 

 Diameter of the aperture more than twice that at 60 mm. below the aperture. 

 Surface marked by very faintly subprismatic and rapidly expanding faces. 



Reticulum coarse-meshed, the primary quadrules being l)ounded by ver- 

 tical spicular bands which traverse the edges and middle of the subprismatic 

 faces and are intersected by horizontal bands of the same strength. These 

 quadrules are trapezoidal on account of the expansion of the cup ; an average 

 example of them measures 11 mm. at the base, 15 mm. at the top and 17 mm. 

 in height. These primary quadrules decrease greatly in size toward the aper- 

 ture and are all distinctly subdivided by the impressions of three or four 

 subordinate series of spicular bands. 



The original specimen has a length of 63 mm. ; an apertural diameter of 

 130 mm., and a diameter at the lower broken end, of 60 mm. 



Locality. From the middle beds of the Chemung group, in the Hydno- 

 ceras tuberosum colony, at the Brown hill school-house, near Cohocton, 

 Steuben county, N. Y. 



Hydkiodictya cylix, sp. nov. 



Plate v, Figs. 1, 2; Plate xvi, Fu;. 2; Plate lV; Fig. 7. 



Sponge regularly conical, rather rapidly expanding ; surface destitute of 

 nodes or other ornamental characters. A small specimen bears a few irregular 

 nodiform elevations which ai'e, however, wholly due to the accidents <^f 

 fossilization. 



Ileticulum regular, the prevailing meshes measuring from 2.5 to 3 mm. 

 on each side, and being subdivided by one or two subordinate series of spicu- 

 lar bands. There is no grouping of these into well-defined quadrules of 

 large size, and no evidence of the projection of the spicular bands into free 

 lamellae. 



The largest specimen observed shows a patch on its surface where the 

 original skeleton had evidently been broken and was subsequently I'epaired 

 by the formation of a highly irregular net, totally lacking the regular c^uad- 

 rulation of the adjoining parts of the cup. 



