486 PALjEONTOLOGICAL report of geological survey. 



Remarks. This remarkable crinoid was obtained several years since 

 at the quarries on Beargrass creek, near Louisville, where it was found 

 associated with Actinocrinus. Dolatocrinus, &c. It is very rare — this 

 specimen is the only one of this species heretofore obtained. 



VASOCRINUS SCULPTUS. Lyon. 

 (Plate IV. fig. 36, 3c, 3d, 3c.) 



Body small; vase shaped; section at the junction of the arms pen- 

 tagonal ; side of pentagon above the anal pieces nearly twice as long as 

 either of the others; the surface is roughened by raised sculpture; the 

 center of the pieces below the arms are all prominent. On either side 

 of the sutures marking the junction of the basal pieces is a raised rib, 

 which terminates at the center of the first radial pieces lying above 

 the sutures. Similar ribs cover the body, extending from near the 

 center of each to the center of all the contiguous pieces, (except the 

 basal pieces,) thus dividing the surface into nearly equal-sided triangu- 

 lar spaces, deeply depressed at the center, and curving up to the ribs 

 which define them ; at the end of the ribs the triangular spaces are 

 joined by a narrow grooved avenue, not quite so deep as the center of 

 the spaces. 



Basal pieces five; pentagonal; as high as wide; extending beneath 

 to the columnar perforation; junction with the column slightly con- 

 cave. 



Radial pieces five; hexagonal; four of equal size; as high as wide; 

 one much larger than the others, rising between the points of the basal 

 pieces. 



Secondary radials {scapulae, Miller) five; irregularly pentagonal; 

 nearly equal in size, except the piece ,on the left of the anal pieces, 

 which is nearly twice as large as either of the others; articulating 

 facet of the arms uneven ; perforated ; sulcated upon the upper side; 

 the pieces curve upwards at their line of junction, and terminate upon 

 the summit above the line of the arms. 



Anal pieces two; hexagonal; one equaling in size the first radial 

 pieces; the other is quite small. 



Arms five; single; structure beyond the first joint unknown; they 

 start from the body in a horizontal direction. 



Column unknown. 



