REVISION OF PALEOZOIC STELLEROIDEA. 279 



of stone. Originally but a few of the arms showed, and it was at 

 once seen by the late Professor Beccher that he had found some- 

 thing very different from a crinid. He bestowed a great deal of 

 skill and labor on the fossil later on, bringing it out to its present 

 rohef, and in this condition it has remained since 1901, the year 

 of its collection. It seemed to both Professor Beecher and the writer 

 that it was an early form of branching or basket star, recalling the 

 hving AstropJiyton. Recently, since reading the work of Sollas on 

 Eudadia, it became clear that this view could not be maintained. 



The specimen seemingly shows the ventral side. 



The disk is large and distinctly pentagonal, and from its five cor- 

 ners radiate the more or less coiled rays. Disk composed of de- 

 cidedly thick plates, apparently closely adjoining, but their arrange- 

 ment is too much disturbed and crystaUine to make out. R = ? about 

 13 mm., r = 10.5 mm., R to edge of rays averaging 22 mm. 



Ra3^s apparently completely cu-cular in outline and covered by 

 an abundance of imbricating scales, of which there are about five 

 across the diameter of a ray. Tlie average diameter of the rays 

 is between 1.5 and 2 mm. As the rays are crystalline the nature 

 of the internal skeleton can not be made out further than that 

 there are vertebrae present. Each radius appears to have 4 pairs 

 of arms, there being therefore 40 m all, but then* situation in the 

 disk and how they appear during growth cannot be made out. Tkree 

 pairs are of the same size throughout, while the fourth pair, which 

 hes upon the others, seems to be about half grown, and if there is no 

 decided distortion of the disk plates, these appeared alternately, 

 first on one side and then on the other. In Eudadia the 30 rays 

 are practically all ahko, but in Euiliemon the 20 arms are equally 

 divided between full and half grown ones. 



Formation and locality. — From about the middle of the Coeymans 

 limestone of the Helderbergian (Lower Devonic), at Jerusalem Hill, 

 Litchfield, Herkimer County, New York. The holotypc is in the 

 Peabody Museum of Yale University. 



Genus EUTHEMON Sollas. 



Euthemon igema Sollas, Quart. Jouru. Geol. Soc. London, vol. 55, 1899, p. 696, 

 figs. 3 and 4 on p. 698. — Sollas and Sollas, Philos. Trans. Roy. Soc. Lon- 

 don, ser. B, vol. 202, 1912, p. 222. 



This genus is very similar to Eudadia, but dili'crs at once in having 

 but 4 arms in each radius, or 20 in all; 10 of these are more than 

 twice as long (12 to 13 mm.) as the others (5 mm.). 



GenoJiolotype and only species. — E. igerna Sollas, from the Wenlock 

 limestone, Croft farm, Malvern, England. 



