514 PROCEEDINGS OF THE NATIONAL MUSEUM vol.89 



Arms. Relatively short and stout. Typically one isotomons divi- 

 sion above the main dichotom. In one half-ray in one specimen 

 there is an additional division giving an endotomous structure. 

 One assumes that in later, at present unknown, fpecies of the 

 genus endotomy would obtain. The first division above the 

 dichotom is high up, with an average of about 10 IIBr. An 

 occasional half-ray as in the 1 post R of the holotype has the 

 division at a considerably higher point. The Br are high and 

 have slightly sloping faces. The pinnules are relatively long 

 and stout. 



Post IR. RA large, entering fairly deeply between post and r post 

 BB. X smaller, extending well above radial facet, X meets 

 post B on a narrow face. RT slightly smaller than anal X, the 

 greater part of the plate extending above the radial facet. Con- 

 tact of RT and r post B narrow. 



Ventral sac. Short, slender, reflexed. 



Column. Circular in section, with prominent nodals and internodal 

 seriesi. 



Characteristic syecles of the genus. — 



DiNOTOCRiNUS coMPACTus. new species 



"Ste. Genevieve," about 7 miles south of Huntsville, Ala. 

 For description, see below. 



DiNOTOCRiNUs KOEMEKi (Troost), new combination 



Cyathocrinites rocmerii Troost, 1850, p. 61, nom. nud. 

 Cijathocrinites roemerii Troost, 1909, p. 86, pi. 6, flg. 11. 



"Carboniferous limestone — vicinity of Huntsville, Alabama."' 

 (Gasper?) 



Cited as synonym of /Scaphiocrinus huntsvillae Worthen by Wood, 

 1909, p. 86. 



DiNOTocRiNUs SALTEUi (Wortlien), new combination 



Poteriocrinus saltcri Worthen, 1882, p. 21. 

 Poteriocrinus saltcri Worthen, 1883, p. 291, pi. 29, fig. 18. 

 Scaphiocrinus saltcri Wachsmuth and Springer, 1886, p. 236 (160). 



"Chester; Chester, Illinoisi." 



Geologic and geographic distribution. — The genus as yet is known 

 only in the lower Chester of Alabama and the Chester of Illinois. 



Relationships. — In its general luibit Dinotocrinus resembles the 

 European genus Woodocrinu-^. Many American species have hitherto 

 been referred to Woodocrinus with little justification. The cyathi- 



