EXPLANATION OF PLATE LXXXI. 



Hypsocrinus fieldi, n. sp. 



Fig. i. Lateral view of calyx, from right posterior ray. 



" 2. Same, from right anterior ray. 



" 3. Same, from anterior ray. 



" 4. Same, from left anterior ray. 



" 5. Same, from left posterior ray. 



In these figures the remains of the brachial plates are seen 

 lying upon the summit of the calyx in an apparently confused 

 mass, but they are mostly in their proper relative positions, 

 and can with reasonable certainty be restored. All figures 

 X%. 

 6. Diagrammatic view of calyx plates, with brachials arranged 

 in natural order; the first brachial of the left posterior ray 

 is missing, but is restored in dotted lines. The rays are num- 

 bered from the right posterior toward the right, and for con- 

 venience of comparison, these numbers, — as well as a series 

 of numbers for the basals, — are carried into the accom- 

 panying figures. 



" 7. Diagram of calyx of Pisocrinus (after Bather). 

 8. Diagram of calyx of Haplocrinus (after Bather). 



(Explanation of lettering on figures: RA=radianal: Rs= 

 super-radial ; Ri= infer- radial : PB=posterior basal : X= 

 anal plate.) 



