90 



WINCHELL AND MARCY ON FOSSILS FEOM THE 



or net-like appearance. The characters about the base are somewhat obscure, and it is pos- 

 sible we have overlooked the real first radial. This supposition would reduce the fossil to a 

 greater conformity with I. Icevis, but it would still be distinct. 



GLYPTOCRINUS Hall. 



Glyporcinns Carleyi ? Hall. Notice of Waldron Fossils, p. 19. We have several speci- 

 mens, in a poor state of preservation, which evidently belong to Glyptocrinus, or one of the 

 allied genera. We are inclined to think the basal plates are entirely covered by the stem. 

 The radials are three in each series. A conspicuous ridge runs along the middle, bifurcate 

 ing at each end, in the centre of the first and third radials. The lower branches of the 

 ridges proceed to the centre of the subradials. The azygos interradius is broader than the 

 others, and contains a plate with radiating ridges. The whole number of interradials can- 

 not be determined. The form of the cvip is pentangularly turbinate, about three fourths 

 of an inch high, with the same diameter at the bases of the arms. In form, size, and dis- 

 position of the visible markings, our specimens agree with specimens from Waldron. 



Glyptocrinus sp. ? A species quite distinct from the last, being more slender, with a 

 more attenuate base, and more spreading rays. Our specimens also are of smaller size. 



LECANOCRINUS Hall. 



Lecanocrinus pusillus W. and M. 



Body small, depressed, broader than high, constricted above the first radials. Basals 

 small, two hexagonal and one pentagonal. Subradials pentagonal and hexagonal, each 

 equal in size to the whole base. Radials three in each ray, the first five-sided, having 

 the upper side longest, the basal sides next in length, and the remaining two parallel with 

 each other; second radial quadrangular, short, being five times as broad as high; third ra- 

 dial with two upper sloping faces supporting a pair of secondary radials. Secondary radi- 

 als transversely oblong, quadrangular ; no more than three have been seen. Height to 

 base of arms, .24 inch; diameter at base of arms, .40 inch. 



EUCALYPTOCRINUS Goldf. 

 Eucalyptocrinus chicagoensis W. and M. 



Body massive, obconic from the base to the 

 arms ; base truncate, deeply impressed, obscure- 

 ly pentagonal, the rim of the impression pre- 

 senting five protuberances corresponding to the 

 intervals between the first radials. Basal plates 

 small, concealed within the basal cavity. First 

 radial plates quadrangularly heptagonal, the 

 upper side presenting an obtusely reentrant 

 angle. Second radials as large as the first, 

 nearly square, but having the lower side angu- 

 lated to suit the reentrant angle of the first 

 radial. Third radials hexagonal, or very nearly 

 pentagonal, the lower lateral sides being rela- 

 tively short, and the upper side almost zero. 

 First supraradial smaller than the third radial, 



F.ucalyptocrinui chicagoensis. 



