122 NEW YORK STATE MUSEUM 



from the interbrachials by the meeting of the first pinnules of each 

 arm with those of its neighbors. 



The last character also separates the genus from Diabolocrinus 

 and in addition the tegmen is not composed of " rather large plates " 

 but of numerous very small ones. 



The incrusted and imperfect condition of this unique genotype 

 which for nearly 50 years has remained the only specimen of the 

 Rhodocrinidae found in the Chazy fauna has caused it to be rather 

 neglected and as yet a good plate, a fairly full description, or a 

 cup analysis of it has not been published. The two additional 

 species of this family published in the report of the State Paleon- 

 tologist for 1903 and the three new species which follow seem to 

 demand a more complete description of this interesting first species 

 of Billings and I therefore offer the following: 



Deocrinus asperatus Billings (sp.) 



Rhodocrinus asperatus Billings. 1859 

 Plate 8, figures a and b; cup analysis figure 5 of text 



Diameter of calyx across zone of primaxils 12.5 mm, narrowing 

 above to 1 1 mm at level of tegmen ; lower half of cup a hemisphere ; 

 diameter of basal concavity 4 mm. 



Infrabasals with their inner ends bent upward at right angles 

 forming a tubular chamber appearing to be a continuation of a 

 large circular stem lumen 1.5 mm in diameter; the outer horizontal 

 shoulders of these plates bear the impression of the proximal stem 

 joint 2.5 mm in diameter [fig. 5]. Each plate bears a faint raised 

 central, radial ridge representing a suture of the proximal ring and 

 on either side of this there are eight or nine short cuneiform ele- 

 vations making a well marked outer circlet, within which is a 

 second circlet of fainter radial lines. 



The basals may be divided into three transverse portions : first, 

 a rather smooth concave inner third, forming the outer portion of 

 the basal concavity, bent at an angle of about 90 degrees with the 

 middle portion of the plate and bearing only very faint and short 

 radial lines, the boundary marked by a strong raised ridge, these 

 ridges making a well marked basal pentagon with the rounded 

 angles on the plates ; second, a rather smooth outer fourth, bent 

 inward at an angle of about 45 degrees and forming a concave 

 margin to the plate ornamented only with numerous extremely fine, 

 raised, irregular ridges usually running toward the interradial 

 plates ; the boundary of this portion marked by a well defined 

 raised ridge concave toward the base of the plate; in other Rhodo- 



