182 DicryospoNoiD^. 



CALATHOSPONGIA, gen. nov. 

 (For description see page 155.) 



Calathosponoia AMPnoRiNA, sp. nov. 



Plate lxviii, Fig. 6. 



Sponge small, abruptly and broadly expanded at the aperture ; body 

 comparatively short, subcylindrical, having considerably less than one-half the 

 width of the aperture; basal portion somewhat expanded, probably terminat- 

 ing abruptly. Surface without ridges, nodes or other irregularities. 



Reticulum composed of very fine spicular bands, producing uniformly 

 small meshes. On the internal cast there are no sharply defined quadrulesbut 

 there is a notable predominance of the vertical spicular bundles which are 

 individualized near the base but in ascending they become broadened and 

 diffuse. 



The single specimen has its flaring apertural portion bent over upon the 

 body of the cup, but the original form of the sponge is very clearly shown. 

 Piart of the base is missing but the slight expansion of the cup in this region 

 indicates a stout and abrupt termination. 



Dlmeasionx. The diameter of the aperture in the specimen described is 

 54 mm. ; that of the body of the cup at the base of the aperture, 20 mm., and 

 the entire length of the specimen 70 mm. 



Locality. In the calcareous shales at Crawfordsville, Indiana. 



CaLATIIOSPONGIA (?) MAGNIFICA, Sp. nOV. 

 Plate lti, Fig. 6 ; Plate lvu. Fig. 1. 



Sponge of large size, funnel-shaped, probably subcylindrical about the 

 body, rapidly and abruptly expanding toward the aperture. Form incom- 

 pletely known. Surface more or less obscurely prismatic and without nodes 

 or other irregularities. 



Reticulum divided into large quadrules by horizontal intersections with 

 the obscure prism-edges or spicular ridges corresponding therewith. These 

 quadrules measure about 24 mm. on a side, over the body of the ciip, but 

 widen considerably toward the aperture. There are four or five subsidiary 

 series of meshes in each quadrule of the first order, the reticulation of the 

 entire surface being thus complete and regular. Probably the principal spicu- 

 lar bands were more or less elevated into erect lamellae. 



