306 THE CRINOIDEA CAMERATA OF NORTH AMERICA. 



other parts of the calyx unknown. Cohimn slightly pentagonal^ each alter- 

 nate johit provided with a node or short spine at the margin. 



Horizon and Locality. — Oriskany Sandstone, Cumberland, Md. 



Type in the American Museum of Natural History, New York. 



Technocrinns Andrews! Hall. 

 Plate XXIV. Fig. 3. 



1859. Hall ; Palgeont. New York, Vol. IH., p. 141, Plate 86, Tigs. 1-4 

 1881. W. and Sp. ; Revision Palseocr., Part II., p. 117. 



A rather large species. Calyx to the arm bases hemispherical ; plates 

 moderately convex, surrounded by sets of short marginal ridges passing in- 

 ward, three to four to each side of the plate, and by small pits along the 

 sutures ; the centre of the plates perfectly smooth. Basals wider than high. 

 Radials large, about as long as wide. First costals of the form of the radi- 

 als, but considerabty smaller ; the second still smaller, narrower as w^ell as 

 shorter. Distichals one, axillary ; supporting in the calyx two rather large 

 palmars, followed by several cuneate, interlocking free plates, and these by 

 two rows of subquadrangular pieces, united by a sharply zigzag suture. 

 Arms four to the ray, strong, flat, and of almost uniform width throughout. 

 Pinnules contiguous. Interbrachials four or five : 1, 2, 1, 1, all compara- 

 tively large. Column round, large, tapering ; the joints rather long and 

 slightly rounded exteriorly. 



Horizon and Locality . — Onskany Sandstone, Cumberland, Md. 



Type in the American Museum of Natural History, New York. The 

 species is described and figured from a cast made from the natural mould in 

 the rock. 



ALLOCRINUS W. and Sp. 



1889. W. and Sp. ; Geol. Rep. Illinois, Vol. VIII. , p. 206. 



Calyx small ; the arms stout ; symmetry of dorsal cup equilateral. 

 Basals three, small, unequal — the left antero-lateral plate one half the 

 smaller — forming a disk, which is almost completely covered by the col- 

 umn. Radials large, much wider than the costals. Costals two, rounded 

 like arm plates. Arms uniserial, strong, simple ; tw^o to the ray, being 

 free from the second or third distichal. Interradial spaces composed of 

 two or three plates, of which the first is much the largest. Column 

 small, round ; axial canal narrow, pentangular. 



