I)lCTYOSPONGID-E. 349 



Calatiiospoxgia cakceralis, sp. nov. 



Plate li, Figs. 2-4 ; Plate lii, Figs. 2, 3 ; Plate lx, Figs. 1, 2. 



1863. Dictyophyton JSFewbemji, Hall. Sixteenth Ann. Kept. N. Y. State 

 Cab. Nat Hist., pL iv, fig. 3. 



Among the specimens utilized for the original illustration of the species 

 Dictyophyton NewLemji, was one large subcylihdrical cup which was doubt- 

 fully regarded as representing the pedicel of that species. A re-examination 

 of this specimen, supplemented by other material, some of which has been col- 

 lected since the date of that description, shows very clearly that such speci- 

 mens represent a quite distinct form of sponge. 



Cup elongate, rather stout, probably circular in cross-section, though all 

 the specimens are more or less flattened. Base broad, terminating abruptly ; 

 from the base upward the body contracts slowly and then very gradually 

 expands to the aperture. The form is thus somewhat like that in certain 

 species of Tittsaxodictya (e.g. Th.pcecilus) but the truncated base affords 

 no evidence of a diaphragm or any other method of closure. 



The reticulum is characterized by strong vertical and horizontal primary 

 ridges, the former being the more conspicuous and in some instances so highly 

 developed as to give a subprismatic appearance to the cup. In the specimens 

 from the Waverly sandstones these vertical ridges are twelve in number and 

 their intersection with the principal horizontal ridges forms quadrules measur- 

 ing about 8 mm. in width and 1'2 mm. in height; the development of the 

 horizontal spicular ridges is. however, quite variable. The subordinate reticu- 

 lation is sharply developed. The apertural margin is regular and the primary 

 reticulation extends to it without material loss of definition. 



Dimensions. The original example which is essentially entire, has a 

 lemrth of 145 mm. ; a width at the base of 33 mm. ; at 40 mm. above the base 

 the diameter increases to 46 mm. ; decreases above to 43 mm. ; and expands 

 to the aperture which is 65 mm. in width. This specimen is from the Wav- 

 erly group. An entire specimen from the Keokuk group is 130 mm. in length ; 

 48 mm. in diameter at the base : 75 mm. at the aperture, and 40 mm. where 

 narrowest. 



Localities. In the shales and sandstones of the AVaverly group at Richfield 

 Ohio ; also in the calcareous shales of the Keokuk group at Indian Creek, 

 Indiana. (The latter from the collection of A. S. Tiffany.) 



