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Spkciks of the Keokuk Group, 



183 



Dimensions. We have represented two large fragments of this Hi)ecie8, 

 both showing the expanded upper portion and a part of the body of the cup. 

 The larger of these has a length of 240 ram., a width below of 140 ram., and at 

 the upper end the diameter, if entire, would be about 300 mm. The second 

 specimen is smaller and shows a somewhat more rapid expansion of the cup. 

 Both of these specimens have been compressed. Fragments of the species are 

 not uncommon but are usually very imperfect. 



Locality. In the calcareous shales at Crawfordsville, Indiana, 



CLEODICTYA, Hall. 

 (For description see page 163.) 



Cleodictya gloriosa. Hall, 



Plate lxix, Fio. 1 ; Plate lxi, Fios. 1, 3, 



1884. Cleodictya gloriosa, Hall. Thirty-fifth Ann, Rept. N, Y. State Mu8; 

 Nat. Hist., p. 479, 



Sponge large, urceolate in form; rapidly expanding from a probably 

 broad and flattened base into the single basal row of nodes, where it attains 

 its greatest width ; above this it is abruptly contracted, thence grailually expands 

 with a smooth surface and graceful outward curvature toward the aperture. 

 From the summit of the nodes downward, which was less than one-half the 

 length of the cup, the surface is gently convex ; above them the surface is 

 concave. 



The nodes are large, strongly convex, obtuse, wider vertically than hori- 

 zontally and are directed obliquely upward resting on the crest of a horizontal 

 ridge produced by the constriction of the cup. The number of these nodes is 

 somewhat variable ; the finest example bears ten of about equal size and shows 

 an additional but incipient node in one of the dividing grooves. A second and 

 smaller specimen has eleven fully developed nodes with an incipient twelfth. 

 These facts indicate the probability of increase in the number of nodes with 

 the growth of the individual as well as their numerical variation in different 

 individuals. The external cast indicates that the nodes were not tufted nor 

 any other part of the surface elevated into spicular lamellae. The grooves 

 separating the nodes are broad and moderately deep, not, however, interrupt- 

 ing the general elevation of the ridge upon which the latter rest. 



Shortly above the upper base of the nodes the surface contracts for about 

 one-fourth the lower diameter of the cup, and its gradual expansion from this 

 point upward continues, it is believed, ^vithout interruption to the aperture ; 



