Speciks ok the OiiEMiJNn Giiotri'. 123 



This species bears some resemblance to G. cajprcxT/ynia of the Waverly 

 group, but differs from it in the smaller size of the i)rincipal quadrilles of the 

 reticulum, its more cylindrical form and more abruptly tapei-ing base. 



Locality. In the upper beds of the Chemung group, Chemung nar- 

 rows, N. Y. 



Clathkospongia vascellum, Hall (sp.). 



Plate xxi, Fig. 12; Plate xxv, Pio. 4. 



1890. Dictyopliyton vascellum, Hall. Ninth Ann. Rept. N. Y. State Geolo- 

 gist, p. 57; Forty-third Ann. Rept. N. Y. State Museum, p. 259. 



The original specimen of this species is a large, explanate fragment indi- 

 cating a flattened cup, one of whose transverse diameters is six times the other. 

 In its normal condition the cup must have been large, quite rapidly expanding 

 and probably regularly conical in shape. The extreme length of the fragment 

 is 188 mm. and the slope of the lateral margins would indicate a length from 

 the upper edge of the specimen to the base, of 260 mm., making no allowance 

 for the unknown extent of the cup beyond this upper limit of the specimen. 

 The surface bears a series of low, broad vertical bands or obscure ridges, 

 which are crossed by somewhat more obsciire transverse bands, making a 

 series of large quadrules, a little longer than broad, and measuring on an 

 average about 26x30 mm. The specimen is an intei-nal cast, and the inter- 

 mediate series of meshes are obscured by the predominance of the ultimate 

 and penultimate quadrules. 



Several fragmentary examples of this species have been o])served, all of them 

 being somewhat water- worn. That here figured is the largest and most complete, 

 affording specific characters not easily confounded with those of other s[)ecies. 



Locality. From the upper portion of the Chemung group; drift at 

 Alfred, Allegany county, N. Y. 



ClATHBOSPONGIA (?) TOMACITLUM, Hall (sj}.). 

 Plate xvm, Figs. 5-6; Plate xxi, Fkj. 11. 



1890. Dictyophytmi tomamlum, Hall. Ninth Ann. Rept. N. Y. State 



Geologist, p. 58; Forty-third Ann. Rept. N. Y. State 



Museum, p. 260. 



Sponge long, slender, probably normally subcylindrical or very gradually 



expanding, though the original specimen is flattened and somewhat arched 



laterally. The length of this specimen is 185 mm. and neither the apertural 



nor basal parts of the cup are retained. Its diameter at the lower end is 



50 mm. and at the upper end 60 mm. 



