28 Cincinnati Society of Natural History. 



Glyptocrinus angularis, n. sp. (Plate I., tig. 10.) 



[Ety. — Angularis, angular.] 



The depression of the interradial spaces gives to this species, when 

 not compressed, a strongl}^ angular outline, the angular appearance of 

 which is increased, by the peculiar downward angular extension of the 

 basal plates below the junction of the column with the bod}'. The 

 radial plates are marked by a strong ridge, which connects them to- 

 gether, and which serves to ornament the surface and increase its an- 

 gularit3\ The surface is further ornamented by the convexity of the 

 interradial plates, which are sometimes produced into a conical form. 



Sub-basal pieces small, pentagonal, and wider at the junction with 

 the column than high. Basal pieces hexagonal, the two lower faces 

 resting between the sub-basals, the two sides joined by the basal 

 pieces themselves, and the two upper sloping sides supporting the 

 first radials. Each basal plate is possessed of an angular or wedge- 

 shaped tubercle, which projects below the point of union between the 

 column and sub-basal plates. The first radial plates are a little larger 

 than the basals, heptagonal, and wider than long. The second radials 

 are smaller than the first, hexagonal, and wider than long. The third 

 radials are about the same size as the second, hexagonal, and support 

 on the two upper sides the secondary radial series. The first secondary 

 radial is hexagonal, and longer than wide. The second secondary 

 radial is heptagonal, and supports upon each of the upper sides a 

 series of brachial pieces, the first two of which form part of the walls 

 of the bod}^ 



The interradial spaces have a hexagonal plate resting between the 

 upper sloping sides of the first radials, which is followed b}' two plates 

 upon its upper sides, and these by three plates in a row between the lower 

 part of the first secondar}- radial plates, and above these about a half 

 dozen small plates fill the narrow termination of each space. Onlj^ two 

 plates are observed — one above the other — in the inter secondary radial 

 spaces, and none have been observed in the interbrachial spaces. The 

 azygos interradial space, or anal area, is filled with a range of elevated 

 plates, resting directly upon one of the basal plates, and extending to 

 the top of the body, between which and the adjoining radial series on 

 each side there are several smaller plates. 



The arms are moderately long, round upon the outside, and composed 

 of very short plates, bearing long strong pinnules. The vault is covered, 

 at the top of the second brachial pieces, with a plate composed of nu- 

 merous granular pieces, much resembling that of Q. decadactylus. 



The column is small and round at the body. Height and breadth 

 of the body subequal. 



This species is readilj' distinguished from all others, b}' its general 



