158 DictyospongiDjE. 



Calathospongia Carlli, sp. nov. 



Plate iii, Figs. 4-7. 



Among some specimens of Dictyosponges from the Waverly group of 

 nortliern Venango county, Pennsylvania, kindly loaned for study by Mr. 

 JojiN F. Carll, formerly of the Second Geological Survey of that state, is one 

 rather lai-ge specimen of the upper portion of the cup which in the aspect of 

 the surface, bears no little similarity to G. Redfiddl but it has a proportion- 

 ally much broader aperture than is possessed by that species. The specimen 

 has been somewhat compressed obliquely, but apparently without serious dis- 

 tortion to the best exposed surface. The body of the cup is moderately nar- 

 row, measuring 55 mm. ; the width of the aperture is 145 mm., but this is 

 perhaps somewhat below its original proportions as the apertural portion of 

 the cup has been slightly enfolded on one side. 



The character of the reticulum is essentially the same as that of C Red- 

 fieUU, the surface being crossed transversely by numerous strong spicular 

 bands, while the vertical bands are very fine and all trace of conspicuous ver- 

 tical ridges is wanted. 



Localities. In the sandstones of the Waverly group. " Found loose on 

 the flats of Oil Creek, near the mouth of Pine Creek. The stream here cuts 

 down about 15 feet below the Berea grit" (Mr. Carll's letter) ; near Pleasant- 

 ville, Venango county, Pennsylvania. The species also occurs in the same 

 rocks at Warren, Pennsylvania, and some of the specimens from there, like 

 that shown in figure 21, page 159, indicate the probable identity of G. Carlli 

 with the fragmentary remains described as Ecteuodictya implexa. 



Calathospongia Tiffanyi, sp. nov. 



Plate li, Figs. 5, 6. 



Sponge subcylindrical toward the base, expanding with moderate rapidity 

 to the aperture, producing an elongate, subconical vase-shape. Surface with 

 obscure traces of prismatic faces which widen upward. Where best preserved 

 these faces are seen to be marked by moderately strong spicular ridges crossed 

 by less prominent bands, the two making quadrules measuring approximately 

 12x10 mm. where the faces are least expanded, but increasing in width, 

 without increase of length, toward the aperture. The intersections of these 

 primary l)ands are obscurely nodose. The subdivision of the quadrules to 

 the fifth degree is very clearly seen on the internal cast. The surface is 

 otherwise devoid of ornamentation. 



