ON SOME PELMATOZOA FROM CHAZY LIMESTONE OF NEW YORK 1 23 



crinidae this ridge usually is continued as an unbroken line along 

 the margins of the radials and brachials up to II Br^ but in this 

 species is broken once or twice on the basal, is lost at the sutures, 

 and appears along the other plates only as a series of rough, elon- 

 gated tubercles ; third, the middle portion of the plate shows a few 



Fig. s Analysis of Deocrinus asperatus. The basal and interradial elements are 

 shaded. Between the interradial sutures of the infrabasals the raised casts of the sutures of 

 the proximal stem joint have been faintly indicated. In the lower right-hand corner is an 

 outline of a vertical section through a basal and an infrabasal. The shoulder of the latter 

 which bears the impression of the proximal ring of the stem is shown at C. 



prominent raised tubercles on either side which indicate ridges which 

 are also represented on the radials by similar tubercles. 



The radials present about the same area as the basals. The first 

 brachial is smaller and bears also a median row of tubercles. The 

 primaxil is still smaller. The first secundibrachs and the inter- 

 secundibrachs are nearly the size of the primaxil, the arm plates 

 become abruptly smaller at II Br 3 , the first plate of the first pinnules 

 is nearly as large as II Br 2 and is in contact with the three next 

 following brachials. 



