1(5 



This species is about the size of Agelacrinus blairi but the 

 plates are smaller and the body is probably less convex. It is 

 the only species yet known from the rocks of the Kinderhook 

 Group, and also the only one that bears four arms. 



Found in the Kinderhook Group at LeGrand, Iowa, and now 

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



AGELACRINUS PULASKIENSIS, n. sp. 



Plate III f Fig. 18, a specimen showing the ovariou or anal 



pyramid. 



Species large, body circular and with more than the usual con- 

 vexity. The outer rim is composed of numerous large squami- 

 form plates, that imbricate inward from the periphery, those near 

 the margin being the smaller, as in all other known species in 

 this genus. The plates of the disc within the outer rim and be- 

 tween the arms are large and imbricating, though a few of them 

 appear to be very slightly imbricating. There are five very long, 

 slender, curving arms, forming convex ridges, four of them sinis- 

 tral and one dextral. The central part of the arms, so far as 

 shown in our specimen, consists of a double row of interlocking 

 plates, which are supported by large plates laterally, that rise 

 nearly as high as the central plates. The central part frcm which 

 the arms radiate is more convex than any other part of the body 

 and is covered with numerous small plates. The ovarian or anal 

 aperture is situated about the middle of the largest inter- 

 brachial area and surrounded by the dextral and one sinistral 

 arm. It is a depressed convex, circular prominence covered with 

 twelve cuneiform plates. The surface of the plates is finely 

 granular. 



This species has some resemblance to Agelacrinus cincinna- 

 iiensiSy but the arms are longer, body more convex, ovarian 

 aperture larger and covered with more large plates. 



Found in the Kaskaskia Group in Pulaski County, Kentucky, 

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



