1879.] NATURAL SCIENCES OF PHILADELPHIA. 311 



gular, the two lower sides making about a right angle. Articulating scar 

 occupying about one-third the width of the plate, somewhat concave, and 

 facing obliquely outward. Brachials varying from two to four or more in 

 the rays, wider than high, rounded on the exterior, the upper one giving 

 rise to two main arms, each of which branches three times. 



Arms long, decreasing in width at each bifurcation, very delicate at the 

 tips, the arm-joints increasing in length upward. Ventral furrow covered 

 by two alternating rows of from two to three pieces. Anal plate small. 



Surface of plates ornamented by strong radiating ridges, two to each 

 radial, which connect with those of the two adjacent basals. They are 

 most prominent on the latter, where they converge toward the middle into 

 a node which points downward. These nodes, and their downward direc- 

 tion, give to the specimen an appearance very like Ollacrinus. Under- 

 basals smooth. 



Column small, round, composed of thin smooth joints, alternating in size ; 

 central perforation round. 



This species is most nearly related to G. lamellosus White, of the Upper 

 Burlington limestone, from which it differs in the number and form of the 

 arms, which in our species are rounded, instead of sharply ridged on the 

 back ; in the surface markings of the calyx, and in the smooth column 

 that of G. lamellosus being beautifully sculptured. 



The specific name is in honor of Dr. Harrod, of Canton, Ind., to whom 

 we are indebted for the discovery and use of specimens. 



Position and Locality. Keokuk limestone (Crawfordsville Division), 

 Canton, Indiana, Collections of C. Wachsmuth and Dr. Harrod. 



7. LECYTHOCRINUS Zittel (not Joh. Miiller). 



1858. Lecythocrinus Miiller. Monatsber. der Berl. Akad., p. 196 (based 



upon an anomalous specimen). 

 1866. Taxocrinus Schultze. Echinod. d. Eifl. Kalkes, p. 30. 

 1879. Lecyllwcrinus Zittel. Handb. d. Petrefactenkunde (uow in press). 



Under tliis generic name, Johannes Miiller described a species 

 which, according to Schultze, was an abnormal specimen of his 

 Taxocrinus briareus. In the original specimen, which is figured 

 by Schultze, Mon. Echinod. d. Eifl. Kalkes, pi. 4, figs. 1 a-e, there 

 are six radials and seven main arms, besides other irregularities 

 in the calyx, plainly indicating some disturbance in the natural 

 growth of the animal. 



In the Am. Journ. Sci., S,ept. 1877, one of us expressed a doubt 

 as to T. briareus being a Taxocrinus, and we have since become 

 convinced that its nearest affinities are with Cyathocrinus and 

 Gissocrinus, from both of which it differs in the construction of 

 the column, and in the small size of its underbasals. If the species 

 possesses five underbasals, as we believe, it ought to be placed 



