20 



the summit (and rarely, a little contracted below). The dome 

 plates are slightly nodose, often a little pointed, but in this 

 respect variable. 



This is a well marked species, and the specimens tary ia 

 hight from less than half an inch, to an inch and three- 

 eighths without important differences. When well preserved, 

 the projecting arm-bases give a somewhat pentalobate aspect 

 when viewed from tho summit. 



Geological Formation and Locality. In the drift about Mil- 

 waukee, supposed to be from rocks of Devonian age. I am 

 indebted to Mr. I. A. Lapham for specimens from this locality. 

 I have also received from Rev. W. H. Barris, of Burlington, 

 Iowa, a specimen of the same species from Iowa City, and 

 presumed to come from the rocks in that neighborhood, which 

 are of Devonian age. Specimens collected by Dr. P. It. Hoy, 

 T. J. Hale and James Hall. 



GENUS EUCALYPTOCRINUS, Goldfuss. 

 EUCALYPTOCRINUS ornatus, (n. s.) 



Description. Body below the arms sub-hemispherical, some- 

 what flattened at the base, with a narrow, deep, pentagonal 

 basal cavity, formed entirely of the basal plates; which are 

 long and gradually expanding towards their outer ends. First 

 radial plates separated from the basal cavity by a deeply chan- 

 neled suture, their width once and a half their height, and 

 widest a little above the midde, upper margins concave. Second 

 radials quadrangular, much wider than high*; third radials 

 hexagonal, larger than the second, widest near the base. 

 First supra-radials but little smaller than the third radials. 

 Socond supra-radials much smaller than the first, pentagonal, 

 supporting on each upper sloping side a small brachial 

 plate upon which rest the arm plate. The first interradial 

 plate is the largest plate in the body, irregularly ten sided, 

 height and width equal; supporting the second plates side by 

 side on its upper edge. Intersupra-radial plates one in each 

 series, proportionally small. Arms and interbrachial plates 

 unknown. 



Surface marked by moderately strong, irregularly radiating, 

 interrupted lines with deep pits : sutures of plates rather widely 

 channelled. 



This species differs from E. ccelatus (Pal. N. Y., vol. 2, pi. 

 47, fig. 4,) in the more nearly hemispherical cup, while the 

 surface ornaments are lines more properly than granules, and 



