ACTINOCRINID^. 567 



It is quite probable that Miller's Stcganocrimis BenedicH * belongs to this 

 species. Its arms are given off in exactly the same manner, and it has the 

 same style of ornamentation, only the calyx appears to be a little shorter 

 than is usual in that form. We doubt if it is a S(e(/anocrinus, for the brachials 

 of each ray, according to the figures, are in sutural contact laterally to the 

 base of the free arms, instead of being given off from the sides of tubular 

 appendages extending to almost the tips of the arms. It is also po.ssible that 

 Miller's Adimcrinus grandis is identical with our species. His description is 

 insufficient for accurate comparison, and his figures show the raj's only to 

 the first palmars. Besides the name was preoccupied by Lyon in 1859. t 



Actinocrinus magniflcus W. and Sp. (nov. spec). 

 Plate LIU. Fig. 2. 



Syn. Act'inocrimts lobatus Wobthen (not Hall), IS'JO, Geol. Rep. Illinois, Vol. TUT., Plate 12, Figs. 8, %a. 



As large as the preceding species. Calyx apparently higher than wide, 

 broadly truncate at the base, slightly constricted at the toj) of the second 

 costals, and more deeply at the interbrachial spaces. The brachial lobes 

 directed obliquely upward, not very prominent, and beginning from the 

 upper end of the distichals, so that there are actually two lobes to each ray, 

 separated by a deep sulcus, with a few interdistichals at the bottom. Plates of 

 the dorsal cuji proportionally thin and slightly convex, their surfaces marked 

 by ridges, which are not mere surface elevations, but folds in the substance 

 of the plates, and which gradually disappear as they pass inward. The 

 surface of the ridges is covered by rows of obscure nodes, which produce 

 a beautiful ornamentation ; the middle of the plates is smooth or slightly 

 tmnid, except upon the radials, which have low, transverse elevations, from 

 which three or four parallel ridges or folds pass out to the basals, while 

 there is generally but one between the other plates. 



Basals very large, forming a deep and broad cup, almost as high as wide 

 at the bottom; the lower end not thickened nor projecting over the top of 

 the column. Radials large, as long as wide, or a little longer ; the costals 

 one half smaller, hexangular and heptangular, the second one nearly as 

 large as the first, and both as long as wide. Distichals all axillary, slightly 



» AdT. Sheets 18tli Rep. Geol. Surv. of Indiana, p. 27, Hate 4. 

 t Amer. Joura. Sci., Vol. XXVIII., p. 240. 



