Beede.| Carboniferous Invertebrates. 43 



radianal and the left posterior radial. First tube plate partially 

 included in the calyx, higher than wide, lying upon one of the 

 upper sides of the radianal and between the special anal and 

 the right posterior radial. Ventral sac very large, expanding 

 above and surrounded at its summit by a row of large, spatulate, 

 spinous plates which form a crown of diverging spines around 

 the summit of the sac." 



Range and distribution: "From the Upper Coal Measures, 

 about TOO feet below the horizon of the Cottonwood limestone, 

 at Neal, Greenwood county, Kansas." 



" Remarks : The form of the plates in the dorsal cup of the 

 species differs materially from the other species of the genus, 

 but the ventral sac, which is the most remarkable feature of the 

 genus, and which is said by Wachsmuth and Springer 2 to be 

 the best character for distinction, in all respects like that in the 

 remaining species. This organ is much crushed and only 

 partially preserved in the type specimen, but enough is present 

 to show its great expansion toward the summit and the crown 

 of large, spinous plates. Eight of these spatulate spinous 

 plates are recognizable in the specimen, all of them belonging 

 to one side, so that there must have been at least fifteen or 

 more altogether. 



"The dorsal cup is remarkable for the large size of the in- 

 frabasals which extend far beyond the column and do not rest 

 in a deep cavity, but are consolidated into an irregularly hex- 

 agonal flat disc. The spherical-triangular form of the basals 

 is different from any of the other species of the genus, and the 

 manner of meeting in one point of the distal angles of the in- 

 frabasals, the proximal angles of the radial s and the lateral 

 angles of the basals is quite remarkable." 



Hydreionocrinus subsinuatus. Plate VII, fig. 14. 



Hydreionocrinus subsinuatus Miller and Gurley, Hull. 3, 111. State Mu- 

 'seum Nat. Hist., pp. 40, 41, pi. vi, ff. 11-14, (1893 , 



Original description- "Calyx depressed, saucer-shaped, 



slightly concave below, longitudinally concave on the ventral 

 side; sutures distinct; surface smooth. When viewed from 



2. Revision of the Paleocrinoiflea, I, p. 130. 



