I»8 PALEONTOLOGY OF NEW-YORK. 



CRIN01DE.E OF THE ORISKANY SANDSTONE" 



Iloiiiocriiius pi'oboscidulis ( n. s.)- 



Plate LXXXIV. Fig. 24 & 25. 



Body sub turbinate : base large. Basal plates wider than long, hexagonal. 

 Kadial plates about as long as wide : ^brachial plates resting upon the 

 truncated upper edges of the radial plates. 



Arms bifurcating upon the third brachial plate, and again upon the third 

 and fifth or sixth plate above the first bifurcation : bifurcations ap- 

 parently equal. 



Proboscis long, fusiform, very slender below, and acquiring its greatest 

 diameter at about two-thirds the distance from base of body to summit 

 of proboscis. 



CoLUJiN unknown. 



This little species resembles the H. scoparim of the Lower Helderberg group, but 

 differs somewhat in the arrangement of the plates of the body and in the bifurcation 

 of the arms. The arm-plates are not as broad as in that species, and they are more 

 incurved at the margins. It differs more conspicuously in the form of the proboscis, 

 which is composed of i.)Iates as in tlie other species; but being entirely silicified, the 

 structure cannot well be made out. 



Fig. 24. The specimen, natural size. 



Fig. 25. Enlargement of the body and bases of the arms. 



Geological position and locality. In tlie Orisliany sandstone : Cumberland, Md. 



• I am indebted to Mr. Wilpiam Asobkws of Cumberland, Maryland, for the valuable and interesting 

 collection of specimens of crinoids of the Oriskany sandstone, as well as for other fossils of the same rock 

 and of the Lower Ileldcrberg limestones. 



