LOWER HELDERBERG ROCKS. 
£43 
Mariacrimis (Subgenus) Teclmocrinus sculptns (n.s.). 
Plate LXXXYI. Fig. 13 & 14. 
Body unknown. Base urn-shaped, gradully expanding 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 sculptured 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. 
Edriocrhius sacculus (n. s.). 
Plate LXXXYII. 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. Badial 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. 
