32 University Geological Survey of Kansas. 



CERIOCRINUS. 



White, U. S. Geol. and Geogr. Surv. Wyo. and Idaho for 1878, p. 12S, (1883). 



Ceriocrinus craigi. Plate VI, figs. 9, 9b. 



Eupachycrinu* craigii Worthen, Geol. Surv. 111., vi, p. 527, pi. xxxn, 



f. 1, (1875). 

 Ceriocrinus craigii Wachsmuth and Springer, Proc. Acad. Nat. Sci. 



Phil., p. 178, (1886); Rev. Paleocrin., in, p. 254. 



Calyx basin-shaped, smooth, concave at base, about three 

 times as broad as high, roundly pentagonal in outline when 

 view r ed from below. Infrabasals hidden by the column, situ- 

 ated within the calyx. Basals probably pentagonal or hexa- 

 gonal, if they have two short sides at base, except the dorsal 

 one, which is truncated for the support of the interradial ; height 

 about equal to the width, strongly incurved at the base to meet 

 the infrabasals. Radials pentagonal, nearly equal, convex, 

 twice as wide as high, upper edge beveled, with a slight depres- 

 sion in the center, upper side faceted over the entire top of the 

 plate, ridges prominent, crenulated, the large one not notched 

 interiorly, furrows distinct, inner portion of the plate depressed. 

 Interradial small, hexagonal, compressed laterally, about half 

 within the calyx, upper portion curving strongly inward. Cos- 

 tals five, short, obtusely spinous, extending half their length 

 beyond the calyx ; lower interior surface faceted to articulate 

 with the radials, upper surface faceted to the tips of the spines 

 for the reception of the two distichals, each of which supports 

 an arm. There is a strong keel on the upper side of the plate 

 extending to its inner edge ; it also gives rise to two lateral 

 ridges w r hich diverge from the tip of the upper surface to the 

 corners of the plate ; the ridges are crenulated ; between these 

 ridges are long depressions. The surface of the calyx is smooth. 



Height. Width. Length of spiue. 



Basals 7| mm. lh mm. 



Radials 6| " 12" " 



Interradial 4l " 3 " — 



Costals 6" " 10 " 9 mm. 



Calyx 6 " 21 " (slightly compressed). 



Range and distribution : Upper Coal Measures ; Kansas City. 

 According to Worthen, C. craigi differs from C. fayettensis in 



