156 DlOTYOSPONGID^. 



the cup, passing upward into a long, shallow constriction ; the apertural part 

 of the cup is again gradually expanded, the greatest diameter being at the 

 aperture, which is unconstricted. The normal form of the sponge as thus 

 described, is best represented by the example shown upon Plate xlix, 

 (figs. 2 and 3) which is essentially entire. The skeleton of this species was 

 evidently very delicate and fragile, as larger specimens are all more or less 

 broken and distorted. Surface quite smooth. 



Meticulwm composed of fine and minute quadrules. Very faint longitudi- 

 nal ridges are visible in places, especially upon one side of the largest observed 

 example, but these can be discerned only over the apertural part of the cup. 

 The more noticeable spicular bands are the horizontal ones which succeed 

 each other at pretty regular intervals of from 3-4 mm. The vertical bands 

 corresponding with these are rarely well preserved, so that the usual aspect 

 of the surface is a succession of narrow horizontal bands. The quadrules 

 formed by the horizontal bands and their corresponding vertical bands are 

 subdivided by four subordinate series of spicules, so that the ultimate division 

 of the surface, which is usually sharply retained, is very minute. Upon 

 certain portions of any given specimen, the coarser reticulation may be Avholly 

 lost, leaving traces of only the finer division of the reticulum. The apertural 

 margin is regular and entire. 



Dimensions. A small, but entire and slightly compressed example 

 has a length of 70 mm.; it measures 32 mm. in diameter at the base ; 30 mm. 

 just above the base, and 33 mm. at a distance of 10 mm. above the base ; at 

 the middle of the cup its diameter is 25 nam., and at the aperture, 51 mm. A 

 large example has been somewhat shortened by vertical compression which 

 has produced an abnormal swelling about the middle of the cup. Its length 

 is 183 mm.; its basal diameter about 96 mm.; at a point slightly above the 

 middle, 72 mm.; and at the aperture, 135 mm. The original specimen has a 

 length of 200 mm.; a basal width of 86 mm.; a median width of 38 mm., 

 the upper part of the cup, which is somewhat distorted, being 105 mm. in 

 diameter. 



Localities. The specimen upon which the original description of the 

 species was based was collected near Harrisville, Medina county, Ohio, in a 

 yellowish sandstone of the Waverly group, by the late W. C. Redfield. It 

 has also been found in the Cuyahoga shale of the Waverly group, at Akron, 

 and at Richfield, Ohio, and also in the Waverly sandstone on Nelson's farm 

 near Pleasantville, Venango county, Pennsylvania. 



