Si'KOIKS OF THE ChEMUNO GroUP. Ill 



evidence of the number of horizontal rows of nodes, but the nodes themselves 

 are seen to be low and sharp, [)r()l()nged into acuminate tufts, separated from 

 adjacent meinljers of the same horizontal row hy a sludlow depression, while 

 the horizontal constrictions between the rows are very deep. Tiie interval 

 between such of these nodes as are shown on the external and internal casts 

 indicate the normal number of eight vertical rows. The spicular bands have 

 left sharp impressions, the prevailing size of the quadrule being G nini. on a 

 side, this being divided by a subordinate series of bands. 



Locality. From the upper portion of the Chemung group at Alfred, 

 Allegany county, N. Y. 



Hydnoceeas, sp. 



Plate viii, Fio. 3. 



A much distorted and broken specimen from the compact green sand- 

 stones of the upper part of the Chemung formation at Wellsville, N. Y., 

 indicates still another species of this genus, in which the nodes are small but 

 prominent, the prismatic faces sharply defined and concave, and the reticulum 

 very fine. Its characters are, however, too obscure to ensure a correct 

 diagnosis. 



BOTRYODICTYA, gen. nov. 



Dictyosponges consisting of two distinct parts ; the lower subcylindrical or 

 very gradually expanding and Avithout sui-face ornamentation ; the upper part a 

 subturbinate cup, very strongly and complexly nodose. These two {)arts are 

 divided by a sort of diaphragm evidently produced by the interweaving and 

 thickening of the reticulum internally at the base of the cup. The upper part of 

 this sponge has the aspect of Hydnoceeas, the compound pouch-shaped nodes 

 being arranged in horizontal rows; the lower part resembles Dictyospongia. 



Type, Dictyophyton ramosuin, Lesquereux. 



Botryobictya eamosa, Lesquereux (sp.). 



Plate xiu, Figs. 1-*. 



1884. Dictyophytum ramosum, Lesquereux. Description of the Coal Flora 

 of the Carboniferous Formation in Pennsylvania and throughout 

 the United States, vol. iii, p. 827. (Second Geological Survey of 

 Pennsylvania, Kept. P.) 



1889. Dictyophytum ramosum, Lesley. Dictionary of Fossils, vol. i, p. 200. 

 Original Description : " Stem nodose or tubercular at the articulations, 



the tubercles projecting outside at right angles to the stem, as short branches, 



inflated and button-like at the apex. 



