J49. CONTRIBUTION TO 



The ventral surface is ornamented with low rounded elevations, minute^ 

 spine-like tubercles and strong nodes at the Junction of the ambulacral ridges. 



The basal funnel is rather small and completely filled by the column. The- 

 columnar canal is five lobed and smaller than in D. eorporosus. The basal 

 flattening hardlj' extends beyond the first radial plates. 



The dorsal cup is somewhat constricted below the arm bases. 



Between two of the arm groups is a contusion-like elevation in the dorsal 

 cup and to the left of it in the edge of the next interradial area, another abnor- 

 mal elevation with a crater-like top. 



The vault is hardly more than convex, with strong radial ridges and cor- 

 sponding deep valleys between them. 



The base of the anal tube is sub-central and rather small. 



There are two respiratory pores to each arm opening, or forty in all. 



The plate arrangement is the same as in other Dolatocrini, differing from 

 that of D. eorjjorosus only in the proportional length and breadth of the sev- 

 eral plates. 



This species comes from the same geological horizon and locality as the last, 

 and is a part of the same collection. 



DOLATOCRINUS CORPOROSUS, Var. Decoratus, N. Var. 



(Rowley) 



Plate U. Figs. 7, 8, 9. 



The body of this beautiful crinoid is more compressed than either of the- 

 above described species, the ventral disk being almost flat. 



The radial ridges are contiuous and the central nodes not conspicuous. 



The mid-interradial nodes are hardly more than centers for the numerous, 

 sharply elevated radiating ridges. These ridges are sharp and strong and. 

 break up into nodes or are toothed in places. 



The ornamentation is much stronger on this than on the preceding species,; 

 except as to the central plate-nodes. 



As in the preceding species, the radiating ridges are in part continuous, 

 with the central node of the first interradial but disconnected with the radial 

 nodes. 



The ornamentation of the ventral surface is short lines of confluent gran- 

 ules, giving a toothed appearnce. 



