256 Cincinnati Society of Natural History. 



pinnules were o\\\y long enough to protect the arm furrows, as none of 

 them are visible. 



The first azygos plate is subquadrangular in outline, and about half 

 the size of the adjoining first radials. It supports a series of plates 

 which are flanged at the upper part, and gradually diminish in size 

 while preserving their length, and also by contracting in the middle 

 become more nearly spool-shaped. Six of these, above the first azygos 

 plate, are shown in our specimen. 



The column is pentagonal, and for about an inch below the head 

 everj' fourth plate bears five side arms, one springing from the middle 

 of each side, and below this every eighth plate bears the same number. 

 In the distance of two inches there are twenty-five plates bearing 

 these side arms, or 125 side arms in two inches in length of the column. 

 These side arms consist of cylindrical plates, having a length about 

 equal to one half the diameter, and being perforated in the middle. 

 They are so short that there are 100 plates or more in an inch. Sup- 

 posing that these side arms of the column were only an inch in length, 

 we would have 12,500 plates in the arms springing from two inches in 

 length of the column. Many of these side arms were thrown across 

 the head, and upon the arms before the specimen was cleaned, and 

 some of them were doubtless more than an inch in length, and I pre- 

 sume from the appearance of the earth around the specimen, that each 

 of them was more than an inch in length. 



This species was collected in the Keokuk Group, at Crawfordsville, 

 Indiana, and is from the collection of I. H. Harris, Esq., of Waj'nesville. 

 Ohio, in whose honor I have proposed the specific name. 



There may be some doubt as to whether or not this species properly 

 belongs to Cyathocrinus, as it does not fall within the limits prescribed 

 for that genus by Wachsmuth and Springer, in their recent work on 

 the '' Revision of the Palffiocrinoidea." 



PaLtE ASTER CRAWFORDSVILLENSIS, U. Sp, 



Plate XV., Fig. 3, dorsal view, natural size and magnified view of the madreporiforni 



plate. 



The species is founded upon the dorsal view of a single specimen. 

 The rays are longer than the diameter of the body, and not of uniform 

 size. The}^ are flattened or depressed in the middle, as is also the cen- 

 tral part of the body. JMan}^ of the plates possess a central tubercle 

 or small spine, and probably all of them did. 



The marginal plates are large, somewhat elliptical in outline, and 

 have their shorter diameters in the direction of the length of the ra3^s. 



