ACTINOCRINID^. 585 



Steganoerinus globosus "W. and Sp. (nov. spec). 

 Plate LXI. Fig. 6. 



Calyx almost perfectly globose ; the distichals a little projecting so as to 

 give to the section a very slightly pentangular outline ; the interspaces be- 

 tween the rays wide, but not depressed as usual in this genus ; the plates 

 nearly flat, and apparently without ornamentation. 



Basals small, disk-like, and following the general curvature of the calyx. 

 Kadials and costals slightly decreasing in size upward, all one third wider 

 than high ; the first costals hexangular ; the second generally heptangular. 

 Of the distichals only one row is preserved, but its plates not being axillary 

 they were followed by another row horizontally disposed, as their facets are 

 directed outward. There are two openings above, which apparently represent 

 the inner cavity of the two ambukcral appendages ; they are large and close 

 together. Eegular interbrachials : 1, 2, 2, 3, followed by the plates of the 

 tegmen. Anal side much wider, the anal plate, which is as large as the 

 radials, supporting 2, 3, 6, and 6 or 7 plates above. Ventral disk hemi- 

 spherical, as high as the dorsal cup ; composed of numerous almost flat pieces 

 of nearly uniform size ; the ambulacral pieces arranged in two rows, which 

 branch on the disk. Anal tube somewhat excentric and rather small. 



Horizon and Locality. — Oolitic bed of the Kinderhook group ; Burling- 

 ton, Iowa. 



Type in the collection of "Wachsmuth and Springer. 



BemarJcs. — The unique specimen from which this species is described is 

 not sufficiently perfect to indicate positively its generic relations. It agrees, 

 however, in all essential characters with Steganoerinus, and we regard it as an 

 early, not fully developed form of that genus. 



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