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NEW YORK STATE MUSEUM 



of one row directly under a plate of the next.^ Some pinnules appear 

 to have been incorporated in the lower portions of the tube. Arms 

 above the IIBr4 are wanting in the specimen. Inter secundibrachs 

 present. 



Genus carabocrinus Billings 

 Carabocriniis geometricus sp. nov. 



Plate I, figures 1-2 



Description. Cup small, its hight from base to level of upper 

 edge of anal x, 6.5mm, its width measured across from base of left 



Fig, 7 Analysis of Carabocrinus geometricus. The outline of the radials is drawn 

 as viewed from the side and the true outline of the oral edges is not seen. The more easily- 

 detected axial folds have been shown by shaded lines. 



posterior I AX 7.5mm, its width half way between base and last 

 measured diameter 6.5mm, subhemispheric with a slight vertical 

 elongation and a tendency to show inversely conical outlines along 

 the lines from, base through the centers of the RR, particularly in the 

 1. posterior R where the flattening of the side of the cup is well 

 marked. Vertical diameter of the IBB a little less than that of the 

 RR and their transverse diameters about one half of the latter ; the 

 IB of 1. posterior R is a little larger than the others and pentagonal, 

 one shoulder supporting the supplemental anal plate, the others are 

 all tetragonal ; the IB of r. posterior R is smaller than the others. 

 The vertical and lateral diameters of the BB are about equal to the 



*It will be seen that such a twist, if I may so call it, could be described 

 as turning either to the right or to the left, or one might consider the tube 

 to be formed of about 20 longitudinal rows of plates without " twist " but 

 with the plates offset. 



