6J. CONTRIBUTION TO 



The specimens are circular in outline, devoid of markings, save the subcentral 

 elevation, the perimeter appearing as a mere raised line. The plications of the 

 Productus show plainly through the crania. The color is a little browner than 

 that of the Productus. 



The horizon is the St. Louis Group and the locality, Georgetown, Ind. 



Types in the collection of G. K. Greene. 



CRANIA? LEMON I, N. Sp. (Rowley.) 



Plate 2L Fig. 26. 



There is considerable doubt in the author's mind as to the correctness of 

 the generic reference. 



The shells are parasitic, white and seem to be made up, for the most part, 

 of a central elevation surrounded by a circular depression, outside of which is 

 a circular ridge or elevation. They vary much in size but all are noticeably 

 small. There seem to be no stria or other ornamentation. The shape is cir- 

 cular. 



The specific name is in honor of the discoverer. Dr. John Lemon, of New 

 Albany, Ind. 



Found in the Keokuk Group, at Edwardsville, Ind. The types are in Mr. 

 ,G. K. Greene's collection. 



iSCAPHIOCRINUS? LON G ITE N T A C UL ATU S, N. Sp. (Rowley) 



Plate 21. Fig, 2T. 



The body of tbis crinoid has been sO badly injured that nothing can be defi- 

 nitely determined as to the arrangement of the ealix plates. However, striking 

 peculiarities in the arms and ventral tube induce the writer to give a name to 

 this very odd crinoid. 



The arms are long, branched and of single pieces, alternately long and 

 short, the former giving off the pinules which are composed of very elongate 

 pieces The outline of the plates of the ventral sack or tube can not be made 

 out satisfactorily, but the tube itself is apparently coiled (recalling some of 

 Angelin's Gotland crinoids) and consists of an outer rim with a double row of 

 very small elongate elevations forming a middle zone or ridge, and one inner 

 rim. The little elongate elevations of the middle zone seem to be pitted and the 

 zone itself is elevated above the rims and traversed by a median toothed or 

 broken ridge. 



The long, strong arms, elongate pinules with their long segments and the 

 coiled ventral tube will suffice to identify the species. 



It was found in the Kaskaskia Group of the Subcarboniferous on White River 

 below the shoals, Martin couny, Indiana. The type is in the collection of Mr. 

 G. K. Greene. 



