PALEONTOLOGIC CONTRIBUTIONS 57 



Eugasterella aranea nov. 



Plate 15, figure 1; plate 16, figures 1-4 



Description. Rays five, slender, of semicircular section, of 

 stiff appearance, distal third whiplike and more flexible. Disk not 

 extending to quite one-fourth of length of rays, with straight or 

 slightly convex margins and well-developed interbrachial areas. 



Ambulacral ossicles elongate cylindrical, as seen from the 

 abactinal side, with beveled edges ; on the actinal side they show the 

 characteristic bootlike projection with a deeply indented " foot " 

 and the outer extremity of the process bent inward ; the entire 

 aspect of the ambulacral groove being very much as in E . 

 1 o g a n i ; with the differences, however, that the ambulacrals are 

 much more slender, the bootlike crests relatively longer (about 

 twice) and the podial cavities not large and subquadratic but 

 obliquely elongate. Likewise the adambulacrals are, while in 

 arrangement and shape alike to those of Eugasterella 

 1 o g a n i , more slender and connected with the ambulacral crests 

 by shorter processes. As seen from the abactinal side, the adambu- 

 lacral plates are distinctly semicircular to semitubular. 



The oral skeleton has been seen only from the dorsal or abactinal 

 side. It is strong and apparently carries small thick syngnaths. 

 The outer margin of the disk is straight or even convex, and the 

 disk is covered with a pavement of small irregular plates, embedded 

 in the integument. The margin does not exhibit larger marginal 

 plates. The surface of the disk plates and integument is finely 

 granulose. The integument is also seen to extend over the entire 

 abactinal side of one ray (see pi. 15). 



Horizon and locality. The specimen was collected by Mr E. E. 

 Davis of Norwich in a cut of the Lehigh Valley Railroad near 

 Park Station, N. Y., from the Wiscoy shale (Upper Portage with 

 Naples beds fauna). 



Remarks. This is probably the most interesting of our Devonian 

 auluroids, since it has developed the ophiuroid aspect in its slender, 

 flexible rays and distinct disk to a greater extent than any other 

 American auluroid. Nevertheless its structure is still that of a 

 true auiuroid, and it shows no traces of a development of ventral 

 shields such as the Devonian genus Klasmura here described 

 (p. 62) already possessed, or of dorsal shields; and the ambulacral 

 furrow with its median ambulacral gutter and podial cavities is 

 still fully exposed. It is, however, remarkable how completely the 



