516 1"HE CE.INOIDEA CAMEBATA OE NORTH AMEEICA. 



first. Arms moderately long, filiform at their upper ends ; composed of 

 cuneate joints, interlocking to biserial. Pinnules comparatively strong, and 

 composed of very long joints. Interbrachials : 1,2,2; the first considerably 

 larger. Anal side very wide ; the first anal smaller than the radials, fol- 

 lowed by a series of four other anals longitudinally arranged, and having 

 at each side, and in contact with them, rows of 1, 2, and 2 plates. 



Horizon and Locality. — Niagara group ; Hartsville, Bartholomew Co., 

 Ind. 



Type in the collection of Wachsmuth and Springer. 



Acacocrinus americanus w. and Sp. (nov. spec). 



Fkde XXXIV. Figs. 15a, h. 



Dorsal cup obconical, wider than high ; the sides convex, spreading more 

 rapidly from the top of the basals to the top of the radials ; the interradial 

 spaces flattened and the cross section obscurely pentangular. Plates but 

 very little convex, their surfaces apparently smooth, the sutm-e lines not 

 grooved. Basals forming a shallow, slightly spreading cup. Radials as 

 large as both costals together, a little longer than wide ; the upper face 

 concave. First costals generally quadrangular, the posterior ones occasion- 

 ally pentangular ; the second costals pentangular or hexaugular, the angle at 

 the upper face very obtuse. Distichals one only preserved in the specimen, 

 quadrangular in outline, as long as the costals but much narrower. First 

 interbrachial almost as large as the radials, and about as wide as long ; the 

 second row consisting of two much smaller plates. Anal plate somewhat 

 smaller than the radials, and the three plates above not more than half the 

 size of the first interbrachial of the regular sides ; the succeeding row con- 

 sisting of three pieces of the size of the distichals. All other parts unknown. 



Horizon and Locality. — Niagara group ; St. Paul, Ind. 



Type in the collection of Wachsmuth and Springer. 



COMPSOCRINUS S. A. Milleb. 



1883. S. A. MiLLEK ; Jonrn. Ciiicm. Soe. Nat. Hist., Tol. TI., p. 233. 



Sjn. Glffptocrimis (in part) — Miller; 1881; ibid., Vol. IV. (April number). Plate I., Pig. 6. 

 Sjn. Mariacrinus (in part) — W. and Sp. ; 1885, Revision Pateocr., Part III., p. 101 (Proceed. 

 Acad. Nat. Sci. Pliila., 18S5, p. 326). 



In its general habitus resembling Ghfptocriims, but having an anal plate 

 between the radials, and only four basals. Basals large, unequal, two of 



