190 NEW YORK STATE MUSEUM 



near the base; its aperture is 33 mm in greatest diameter. This 

 species is from the sandstone of the lower part of the Chemung 

 beds, at Deyo basin in the town of Xaples N. Y., where it is 

 associated with man^' characteristic species of the Chemung 

 marine fauna together with the following lyssacine sponges: 

 H y d n o c e r a s y a r i a b i 1 e H. and C, Hydriodictya 

 cylix H. and C, Ceratodictya annulata (Conrad). 



Nepheliospongia avocensis, sp. nov. 



Plate 10, fig. 4; plate 11, fig. 1 



This is a much larger sponge, of more funnel-shaped aspect, 

 and with rather coarser but not different reticulation. Its sur- 

 face presents a series of low, transYerse corrugations which may, 

 perhaps, arise from oblique compression but appear to be normal, 

 as they occur in both of the examples obserYed. One of these 

 examples, though slightly defectiYe at each extremity, has a 

 length of 105 mm and the same width at the apertural end; the 

 other, which is more complete, has a length and apertural width 

 of 110 mm. Both are from a high leYel in the Chemung 

 strata, near AYOca, Steuben co. More precisely, their locality 

 is the sponge plantation on the Cotton farm, about 1 mile 

 north of the Yillage, a colony located by D. D. Luther and the 

 writer, which has produced a considerable number of interesting 

 dictyosponges. Hydnoceras tuberosum Conrad and 

 H. a Y c a H. and C. are there by hundreds, and in addition to 

 these may be mentioned the species Aristodictya typica, 

 A.~^nodifera and Hallodictya cottoniana, H. 

 and C. 



