32 



This species is remarkable for the tumid subradials, large, 

 rough arms and short, stout pinnules. The calyx is that of a 

 Cyathocrinus, but the arms and pinnules resemble those in some 

 species of IScaphiocrinus. This species is so different from any 

 hitherto described that no comparison with any of them is 

 necessary to distinguish the species. 



Found in the Keokuk Group, on Indian creek near Crawfords- 

 ville, Indiana, and now in the collection of Wm. F. E. Gurley- 



CYATHOCRINUS SIGNATUS, n. Sp. 



Plate VI, Fig. 10, side view of calyx and part of the arms. 



Calyx small, cup-shaped, height a little more than the diame- 

 ter; sides unequal; sutures distinct; plates slightly convex; sur- 

 face smooth or granular; column small. 



Basals form a shallow cup with sharp superior angles. Sub- 

 radials rather longer than wide and about twice as large as the 

 basals. There appears to be only four subradials, in our speci- 

 men. The plate on the right of the illustration occupies the 

 place of a subradial and radial, while the azygous plate trun- 

 cates the subradial on the right of it. Possibly the plates are 

 anchylosed; or the specimen is abnormal. First radials unequal 

 in size and not uniform in shape. The arm facets occupy about 

 half the width of the plates, face outward, and the superior 

 lateral sides of the first radials slope down to the sutures. The 

 arms are very different from each other and divide with great 

 irregularity, but they divide so frequently that there are more 

 than a hundred and probably twice that many of them. They 

 are composed of rather long pieces. The azygous plate broadly 

 truncates a subradial and is about as large. The proboscis 

 mav be seen within the labyrinth of small arms in our specimen, 

 where it is composed of large plates and appears to be balloon 

 shaped. This species would seem to have its relations with C. 

 labyrinthicus, though it is so different that no comparison is 

 necessary to distinguish it. 



Found in the Keokuk Group, in Washington county, Indiana, 

 and now in the collection of Wm. F. E. Gurley. 



