30 



Family CYATHOCRINIDiE. 



CYATHOCR1NUS ANDERSONI, n. Sp. 



Plate III, Fig. 2, symmetrical side; Fig. 3, azygous side. 



Calyx large, deep, cup-shaped, longer than wide, oblique, 

 longer on the symmetrical than on the azygous side; plates very 

 thick, tumid, and ornamented with wart-like protuberances; 

 sutures very distinct. Column round and composed of plates 

 near the calyx, which are highly inclined toward the azygous 

 side. 



Basal plates quite uniform, in size, and forming a round basin 

 nearly three times as wide as high; each plate bears a strong, 

 central tubercle and some of them have two tubercles- Sub- 

 radials twice as large as the basals, four hexagonal and one 

 heptagonal, very tumid and each one is ornamented, in the 

 central area, with several large tubercles, irregularly disposed, 

 and some of which are confluent. First radials larger than the 

 subradials, tumid, deeply notched for the arm furrows and curv- 

 ing in at the superior lateral angles; facet for the reception of 

 the second radials large and excavated downward two-thirds the 

 length of the plates; plates ornamented, below the facet, with 

 irregular tubercles. First azygous plate quadrangular, longer 

 than wide, and resting upon the upper truncated side of the 

 heptagonal subradial, and rising to the level of the bottom of 

 the arm-furrows, in the first radials. The surface of it is also 

 tuberculated. 



This species is related to C. farleyi. Our specimen is much 

 larger than the type of C. farleyi, which might account for differ- 

 ences in the surface ornamentation, if there were not other 

 differences of specific importance. In that species, the basal plates 

 are proportionally much smaller than they are in this, and form 

 a flattened pentagonal disc, while in this, they form a basin, 

 which increases the comparative length of the calyx. The superior 



