64 The Ohio Journal oj Science [Vol. XIX, No. 1, 



photograph of the type specimen of Dr. Dyche, never before 

 pubhshed. 



Agelacrinus holbrooki James: Described in the Palaeon- 

 tologist in 1878 and redescribed and figured in 1887 in the 

 Jour. Cin. Soc. Nat. Hist. 



Body circular, subglobose. Disc composed of many thin 

 plates, those in the inter-radial areas pentagonal or hexagonal, 

 outside squamiform, imbricating; margin of disc composed of 

 numerous small cuneiform and variously other shaped plates. 

 Arms or rays not raised above the surface of the disc, four 

 sinistral and one dextral ray, each composed of two rows of 

 interlocking pieces. Ends of rays curving quite sharply upward 

 and inward, making nearly a semicircle to near the center of 

 the inter-radial areas and terminating in a blunt, club-shaped 

 form. 



Ovarian (anal) aperture situated subcentrally in the area 

 between the dextral and one of the sinistral rays, depressed and 

 composed of ten cuneiform pieces and an outer row of small 

 thin plates placed apparently on their edges. The end of the 

 dextral ray passes into or against the plates of the ovarian 

 aperture. " 



Agelacrinus faberi Miller, 1894: One specimen only. The 

 distinguishing character, "surface of all the plates is densely 

 and beautifully tuberculated. " The specimen according to 

 Foerste is merely an A. pilens covered by an over-growth 

 of some Dermatostroma. 



Agelacrinus austini Foerste, 1914: "Characterized chiefly 

 by its small size. Very moderate convexity, exposed part of 

 the lateral covering plates ovate triangular in form, spaces 

 between adjacent plates occupied in each case by one of the 

 central or median series of covering plates of which a relatively 

 greater length frequently is exposed than is the case of any 

 other known species. vSquamose inter-ambulacrals rather few. 

 Anal pyramid, outer circle 6 ovate triangular plates, probably 

 an inner circle of about the same. Inner band of peripheral 

 ring one circle of large plates. Above this one circle graduating 

 into the inter-ambulacral series, below this a third series 

 graduating into the successively smaller plates forming the 

 outer or marginal series of the peripheral ring. Peristomial 

 plates believed to include corresponding to L, R and P. " 



