LOWER HELDERBERG ROCKS. 143 



Mariacrinus (Subgenus) Techiiocriiius sculptus (n.s.). 



Plate LXXXVI. Fig. 13 & 14. 



Body unknown. Base urn-shaped, gradully expandiqg above, abruptly 

 expanded at the junction of the column : cavity for the insertion of 

 the column large. Basal plates marked by strong sharp ridges, which 

 diverge from the base to the upper margins, and unite upon the lines 

 in the direction from the angles to the base of the plates. ' 



The strongly sculptmed markings of the plates, and the form of the base, will 



serve to distinguish this species from any other at present known to me. Two other 



specimens have been found, each preserving similar characters. There are likewise 



a few large plates and some fragments of columns which may belong to this species. 



Fig. 13 & 14. Basal and lateral view of the lower part of the body. 



Geological position and locality. In the Oriskany sandstone, Cumberland, Md. 



Edriocriiins sacculus ( n. s.). 



Plate LXXXVII. Fig. 1 - 22. 



Body more or less obconic or turbinate below and cylindrical above, 

 varying in its proportions of length and breadth. Base varying in form 

 from turbinate to hemispheric, solid, often obliquely truncate or in- 

 dented below : upper margin marked by six subangularly concave 

 depressions for the insertion of the radial and anal plates. Radial plates 

 large, longer than wide, inserted into the depressions in the margin of 

 the base, gradually expanding towards the upper margin which is 

 thickened externally, slightly concave for the reception of the plates 

 of the arm. 



Arms broad at the base, composed of numerous very short transversely 

 linear plates, of which ten or twelve or more occur below the first bi- 

 furcation ; first bifurcation in the middle, and each side again bifurcating 

 on the third or fourth plate above, with each division bifurcating once 

 or twice beyond this ; making eight or ten or more divisions at the 

 extremities. Anal plates two, the lower large and of the same form as 

 the radial plates ; the second one small and short. 



