UTew Crinoids and Brachiopods. — Rowley. 
151 
NEW SPECIES OF CRINOIDS AND BRACHIOPODS 
FROM THE MISSOURI HAMILTON. 
By R. R. Rowley, Louisiana, Mo. 
Melocrimis tersus. (n. sp.) 
Fig. 1. Side view of the body, natural size. 
Calyx obconical ; dome almost flat ; basal plates four, three 
of which are quadrangular, the fourth and largest pentagonal. 
Breadth nearly twice the length, but slightly expanded; exca- 
vated for the reception of the column. 
Of the first radials, three are heptagonal and two are hex- 
agonal ; width a little greater than length. Of the second 
radials two are heptagonal, two hexagonal, another? octago- 
nal. In the ray to the left of the anal area, the second radial? 
is entirely separated from tin- first radial (a malformation) 
Figs. 1-10. — II lustrations of the species described in this paper. 
by the abutment of the lower lateral edges of the large piece 
of the anal area and the large interradial to the left of the 
anal area. Third radials heptagonal, supporting, on the upper 
sloping sides, two small secondary radials. 
Interradial areas filled by from 12 to 14 pieces, the lowest 
one of which is almost as large as the first radial and hexa<r- 
