59 



other side. There are four orifices on the summit, one of whicli 

 is as large as the mouth, and directly back of it, and surrounded 

 by four plates, two of which belong to the third series of plates. 

 The other two are smaller and each surrounded by three plates, 

 the smallest passes between plates belonging to the summit, and 

 the other is at an angle of tv^^o plates in the third range. One of 

 the summit plates adjoining tbe mouth bears a prominent node. 



This species is so distinct from either of the others in form 

 and surface ornamentation and in the summit plates that no com- 

 parison with either is necessary to distinguish it. It will be ob- 

 served, that the summit plates and orifices differ greatly in this 

 genus, which reduces them to matters of specific importance only. 

 The number of plates in each range below the summit agree with 

 those in Caryocrinus. The pores in Cdryocvinus may be of 

 generic importance, but it is not likely that they are of family 

 importance. Considering the fact that within the range of a genus 

 the species vary among Cystideans more than elsewhere, and 

 allowing like latitude, in the classification of the genera into fam- 

 ilies, we may place the genus Slribalocysfifes in the family Cary- 

 ocrinidce. This view is strengthened by the fact that all the forms 

 are from the same group of rocks. 



Found in the Niagara Group, at St. Paul, Indiana, and now in 

 the collection of Wm. F. E. Gurley. 



CARYOCRINUS KENTUCKIEN8IS, n. Sp. 



Plate V, Fig. 22, anterior side ; Fig. 23, posterio-laieral side; Fig. 



24, summit vieic. 



Species small, subelliptical longitudinally. Plates more or less 

 convex, and bearing a few very small pores. The pores are so 

 small that thej' can only be seen by the aid of a magnifier, and 

 hence are not shown in the illustrations. The surface of the plates 

 is sculptured, but our specimen does not preserve these markings, 

 so as to describe them. The sutures are beveled. The body is 

 not constricted below the arms, and is only truncated below to the 

 extent of the diameter of the column. 



Basals form a low subhexagonal cup with a hexagonal summit, 

 and slightly re-entering angles at the sutures. The base is con- 

 cave for the attachment of the column, and bears a round orifice 

 for the columnar canal. The plates in the second range are 



