MELOCRINIDJE. 283 



are thickly covered with fine granules, producing a most beautiful orna- 

 mentation. 



Basals small, forming a short cup ; the columnar attachment small ; the 

 axial canal pentalobate. Kadials and costals large, as wide as long. Dis- 

 tichals two or 3X10, somewhat smaller. Pal mars three to four in the calyx, 

 decreasing in length upwards; the upper plates of the two inner divisions 

 axillary, supporting two arms, those of the outer divisions quadrangular, 

 bearing a single arm from the calyx. Arm openings thirty, directed up- 

 wards and not visible from a side view ; the arms are not preserved in any 

 of the specimens. Interbrachials : 1, 2, 3, 3, 3 ; followed by other minute 

 pieces, which pass into the disk. Anal side wider : 1, 3, 4, 4, etc. ; the first 

 plate larger than the corresponding plate of the other sides, and there being 

 no anal ridge. Ventral disk very short, almost flat; the interambulacral 

 spaces depressed. Surface covered by hundreds of very minute pieces with- 

 out orals, the plates being so small as to be readily taken for mere granules. 

 Anus excentric, placed at the summit of a small protuberance. Column 

 unknown. 



Horizon and Locality. — Niagara group ; Waldron and Hartsville, Ind. 



Mariacrinus Warreni Eingueberg. 

 Plate XXIL Fig. 1. 



1888. RiNGUEBERG ; Proceed. Acad. Nat. Sci. PMla., p. 133, Plate 7, Pig. 4. 



Of the type of M. Carleyi, but having two distichals instead of three, and 

 no palmars in the calyx. It also differs from that species in the details 

 of its ornamentation. Calyx obconical, slightly contracted above the second 

 costals. Kadial ridges rounded, wide and quite prominent ; the surface finely 

 corrugated ; and there are series of smaller transverse ridges meeting those 

 from the interbrachials. 



Basals four, forming a conical cup. Eadials and costals comparatively 

 large, wider than high. Distichals two, rather small. Palmars two or three 

 in the calyx; in form resembling arm plates, but longer. Arms twenty; 

 long, slender, tapering gradually to a sharp point ; the joints short, quad- 

 rangular ; their upper and lower faces almost parallel. Pinnules delicate, 

 long, closely packed; composed of joints twice as long as wide. The arrange- 

 ment of the interbrachials cannot be accurately ascertained from the speci- 

 men, but it is apparent that the proximal plate at all sides rests upon the 



