INDIANA PALEONTOLOGY. 95. 



CODASTER PYRAMIDATUS, Shumard, Rowley. 



Platk 30. Figs. 18, 19, 24, 25, 22-23. 



The three basal plates form the frustum of an elongated triangular pyra- 

 mid. The radial plates in the larger specimens are a little more than one-half 

 the body length and form five strong lobes. 



The interradial plates are confined to the summit and either side of the 

 interradial ridge are cut by from five to seven hydrospire clefts. 



The ambulacra are narrow, and but little above the interradial plates. 

 The central opening is five-pointed, and the anal aperture round. The body 

 in cross section, is stellate, due to the lobed character of the radials. 



The ornamentation is longitudinal lines. 



The first or basal joints of the column are probably triangular and the per- 

 foration is minute. 



Middle Devonian, Columbus, Ohio. Collection of Mr. G. K. Greene. 



CODASTER ATTENTAT US, Lyon, Rowley. 



Plate 30. Figs. 20-21. 



This species, while quite as large as C. pyrami^latvs, is never so strongly 

 lobed. The whole specimen is conical in shape and the basal plates form over 

 a third of the entire height of body. The radials are narrow, elongate and 

 their upper edges are tucked in toward the summit. 



The interradials are confined to the summit. 



The ambulacra are narrow and hardly above the interradial area-^. The 

 hydrospire slits are from 6 to 8 between the interradial ridge and adjacent am- 

 bulacrum. The central opening is stellate and small. The anal opening is 

 round. 



A cross section varies from round to pentagonal. The surface is orna- 

 mented by longitudinal lines. 



Formation, locality middle Devonian, Falls of the Ohio. Collection of Mr. 

 G. K. Greene. 



CODASTER Sp? 



Plate 30. Figs. 26-27x2. 



These pretty little Codastei's are unfortunately too poorly preserved for 

 identification. 



They are conical in shape and the basal plates are half the body length. 



