300 New Species of Crinoidea from the 



GENUS POTERIOCRINUS. 



Poteriocrimis dilatatus (n. s.). Cup of body very small, 

 broadly expanding. Basal plates minute, pentangular, 

 slightly projecting beyond the column. Sub-radial plates 

 small, hexagonal, except one on the anal side which is 

 heptagonal, length and breadth about equal. First radial 

 plates irregularly pentagonal, having one of the upper 

 lateral angles slightly truncated by the second radial plate 

 of the adjacent ray. Second radial plates nearly twice as 

 large as the first radials, the plates of the adjacent rays 

 joining at their lateral margins, very obtusely wedge-form 

 above, supporting the plates of the arms on the sloping 

 upper sides. Anal plates small, four seen in specimen, 

 form not determined. 



Arms two from each ray, bifurcating on the sixth plate 

 from the base, and the outer divisions again bifurcating at 

 the sixth plate above the first division, and again at irreg- 

 ular distances above. Surface of plates of the lower part 

 of the body depressed-convex, becoming inflected at the 

 sides as they approach the arm bases. 



Proboscis large and inflated, rising from the top of the 

 small cup, and extending nearly as high as the extremities 

 of the arms ; small and constricted near its base, and rap- 

 idly expanding until it becomes throe times as large in 

 diameter as the calyx, and terminating above in a highly 

 convex dome, the lines of junction between the upper 

 and lower parts being strongly angular ; the lower part is 

 composed of several series of small elongated polygonal 

 plates, which gradually increase in size towards the inflat- 

 ed ])ortion ; each series of plates is traversed longitudinally 

 by a sharp, angular, elevated ridge, which terminates on 

 the plate on the widest part of the inflation in a lanceolate 

 or pointed node. The plates composing the dome of the 

 proboscis are comparatively large and elevated, each 



