Beede.] Carboniferous Invertebrates. 35 



Ceriocrinus niissouriensis. Plate VI, fig. 6. 



/)< locrinus missouriensis Miller and Gurlev, Jour. Cine. Soc. Nat. Hist., 

 mi, p. 14, pi. ii, ff. 11 13, (lS90i: 1(5 th Rep. St. Geol. Ind., p. 336, pi. 

 ii, ff. 11-13, (1890). 



Delocrinus hemisphericus Miller and Gurlev, ibid., p. 335, pi. n, ff. 8 10, 

 pi. x, f. 5: Jour. Cine. Soc. Nat. Hist., xin, p. 12, pi. n, ff. 8-10. These 

 species referred to the proper genus bv Weller, Bull. U. S. Geol. Surv.. 

 153, p. 17-2, 1 1S98). 



Calyx basin-shaped, shallow, pentagonal in outline viewed 

 from below, nearly four times as broad as high, base quite con- 

 cave. Infrabasals small, not entirely hidden on the exterior. 

 Basals five, moderately large, pentagonal (the angle at the base, 

 if it exists, is so small that it is almost impossible to discover it) 

 except the posterior one, which is truncated for the reception of 

 the interradial, giving it a hexagonal outline, about as high as 

 wide; supralateral edges about equal, basal edge very short ; 

 plates not very sharply convex in the center. Radials five, 

 nearly equal, about twice as large as the basals, and about 

 twice as wide as high, upper edge beveled and upper side 

 faceted, ridges of facet crenulated. Interradial small, laterally 

 compressed, the upper portion bent strongly inward. Costals 

 live, roughly triangular in outline, stoutly spinous, faceted be- 

 low for the articulation with the radials, entire surface of the 

 inner portion faceted above for the support of the two arms ; the 

 spines are stout and blunt. The arms are composed of two 

 series of cuneiform interlocking plates which are rather convex 

 on the exterior on the base of the arms. The surface is smooth. 



Height. Width. Length of spine. 



Basals 8 mm. 6 mm. 



Radials " 12 " 



Costals 8 " 11 " 14 mm. 



Interradial 5 " 3 " 



Calyx * another individual . i 6 " 21 " 



Range and distribution : Upper Coal Measures; Kansas City, 

 Argentine. 



It is impossible to distinguish this species from C craigi by 

 the calyx alone | if it is distinct from that species) unless the 

 base is so preserved as to show whether or not the infrabasals 

 are concealed, unless the costals be present. The only differ- 

 ence between the two species is that in C. missouriensis the 



