59 



What we have of this species is so different from others that 

 have been described, that no comparison is necessary to dis- 

 tinguish it. 



Found in the Upper Coal Measures, at Gilpin, Missouri, and 

 now in the collection of Wm. F. E. Gurley. 



iESIOCRINUS ANGULATUS, n. Sp. 



Plate VI, Fig. 9, view of calyx and part of an arm and. three 

 azygous plates. The specimen is a little depressed. 



Calyx bowl-shaped, twice as wide as high; broadly truncated, 

 below; plates tumid and angular; sutures deep, most depressed at 

 the angles ; surface granular. Column round or subelliptical and 

 the end slightly inserted in the basal plates and attached by 

 radiating denticulations near the outer circumference. Columnar 

 canal very small and round. 



The basals form a flat, pentagonal disc about one-half wider 

 than the diameter of the column. Subradials large; four hex- 

 agonal, one heptagonal, directed nearly horizontally from the 

 basals so as to form a pentagonal disc around the basals. The 

 plates are subpyramidal and angular, with the apex directed 

 downward so as to leave about half of the plates below the level 

 of the basal plates, and if the calyx is made to stand upon a 

 plain, it will rest upon the apices of the subradials. The supe- 

 rior angles of the subradials are deeply sunken, as is usual in 

 Barycrinus. The first radials are thick, heavy plates, about 

 twice as wide as high, truncated nearly the entire width above 

 and having; the facets inclined outward at an angle of about 

 forty-five degrees. They are convex, with a transverse obscure 

 ridge in the central part and beveled toward the sutures. The 

 superior face has a transverse ridge and narrow furrow near the 

 outer margin and a broader furrow on the inside of the ridge; 

 the inner central part is notched for an arm furrow. The supe- 

 rior face has the appearance of supporting a single plate, but 

 in the part of one of the rays which is preserved, we see it sup- 

 ports a central axillary plate occupying about one-third of its 

 width, and a plate on each side of the axillary plate occupying 

 the outer part of it. Each of the lateral plates supports two 

 interlocking plates that have an arm furrow on the inside, 

 which indicates that there are two arms to each ray, or ten 



