298 DicriYospoNGiD.*. 



PLATE L. 

 TIIAMNODICTYA, Hall. 



Page 160. 

 (See Plates LII ami LIII.) 



TlIAMNODICTYA NeWBEKKYI, Hall. 



Page 161. 

 (See Plate LII.) 



Figure 1. An entire frond showing its broad vase-shaped expansion and 

 coarsely reticulate surface. This specimen is largely an internal cast 

 in soft shale but retains the features of the exterior. 



Figures 2, 3. Opposite sides of an internal cast of a small frond which has 

 been ruptured along one side, btit preserves a portion of the 

 apertural mai'gin and shows the disappearance of the coarse spicular 

 bands, and tlie predominance of the finer net-work in this region. 



Figure 4. An enlargement of a portion of the surface of an internal cast. 



Figure 5. An internal cast of the expanded portion of a specimen. 



Figure 6. An enlargement of a portion of the surface shoAvn in fig. 1. 

 Waverly group. Cuyahoga Falls, Oliio. 



CALATIIOSPONGIA, gen. nov. 



Page 155. 

 (See Plates XLVIII, XLIX, LI, LII, LVI, LVII, LX, LXVIII.) 



Calatiiospongia (?) SACCULUS, Hall (sp.). 



Page 160. 



Figure 7. A view of the specimen, showing its shoi't subcylindrical, iinex- 

 panded form and the character of its reticidation. 

 Waverly group. Jiiclifiekl, Ohio. 



CLATHROSPONGIA, Hall. 



Page 121. 

 (See Plates XIV, XV, XVIII, XXI, XXV, XLIX.) 



Clathrospongia caprodonta, sp. nov. 



Page 154. 



Figures 8, 9. Opposite sides of an essentially complete internal cast, which 

 represents a long slender cup with a subprismatic surface and traces 

 of l(jw nodes at the angles of large quadrules.. Only the coai'ser 

 reticulation of the skeleton is appai-ent. 

 Waverly group. Portsmoufh, Ohio. 



