FOSSIL CRINOIDS. 157 



excrements of the Crinoid, this would indicate that the position of the anal open- 

 ing, in this species and in the genus generally, is near the base of the sac. The 

 distal ends of arms, which are seen pointing downwards, probably curved over 

 where the sac contracted towards the point, leaving its narrow end free, as in 

 Fig. 1, Plate IV. 



Further useful details are shown by the figures on Plate VI. Fig. 2 shows 

 the extreme shortness of the brachials in the arm for a long distance up, and 

 also the position of the Platyceras, corroborating the estimate of height of the 

 combined specimens on Plate V. This specimen has some extra small plates 

 interposed between infrabasals and the posterior basal, which are abnormal. 

 Fig. 1 shows the small and rapidly tapering lower pinnules, and also the plated 

 skin of the tegmen at the base of the sac. Fig. 3 is a much younger specimen 

 than the others, and shows the greater sharpness and continuity of the striated 

 folds, which here pass to the middle of the plates, as in the young of P. doris. 



This species might be considered as a tremendously exaggerated P. (It}ris; 

 but its short brachials would distinguish it at once, and it has taken on another 

 thoroughly distinctive character in the number of primibrachs, which is here 

 two or more; two is the rule, but three specimens out of five have more, irregu- 

 larly, in at least one ray. 



CYATHOCRINIDAE. 



Parisocrinus subramosus (Miller and Gurley). 

 Plate IV, fig. 18. 



1890. Pnteriocrinus subramosus Miller and Gurley, Desc. New Species Echinodermata, p. 49, PI. X, 



fig. 1. 

 1890. Poleriocrinus subramosus Miller and Gurley, 16th Rep. Geol. Indiana, p. 36.5, PI. X, fig. 1. 

 1892. Poleriocrinus subramosus S. A. Miller, N. Amer. Geol. and Pal., First Appendix, p. 681. 

 1898. Poleriocrinus subramosus Weller, Bibliogr. Index N. Amer. Carbonif. Invertebr., Bull. 153, 



U. S. Geol. Surv., p. 478. 

 Syn. Poleriocrinus circumlexlus Miller and Gurley, Bull. 5, 111. St. Mus., 31, PL 11, figs. 29, .30. 



I have figured a very good specimen of this species, in order to direct atten- 

 tion more definitely to its intermediate character between Poleriocrinus and 

 Cyathocrinus, all of the species referred to it having been described under other 

 names, and authors apparently not being clear as to what it is. Its Cyatho- 

 crm«s-like calyx and arms, and round facets, with its Poteriocrinus-like anal 

 structures, are well shown. The ventral ,sac, which is unusually well preserved 

 in this .specimen, is entirely different from that of Poleriocrinus, and more of the 



