324 New Species of Crinoidea from the 



Rhodocrinus Barrisi var. divergens. Another specimen, 

 having apparently the same surface characters of body? 

 differs in the arm structure ; ah hough at their origin there 

 is the same number of arms, they bifurcate near the base, 

 and one of the divisions again divides at less than half 

 the length of the arm, making five branches to each ray, 

 instead of four as in the typical species. The branches at 

 their bifurcations are strongly divergent. The arms are 

 composed of a double series of plates, which unite on the 

 back of the arm, as in most species of Actinocrinus. 



With these strong points of difference, this may be 

 classed as a variety of the preceding species. 



Geological formation and locality. The same as the 

 last. Collection of Rev. W. H. Barris. 



Rhodocrinus Whitei (n. s.). Body sub-spheroidal, deep- 

 ly and abruptly concave at base, and contracted just below 

 the arm bases, giving an expansion to the base of the 

 dome, which is depressed-convex. Basal plates concealed 

 by the column. Sub-radials large, somewhat hexagonal. 

 First radials heptagonal ; second hexagonal; third hep- 

 tagonal, gradually diminishing in size in the successive 

 series ; the last supporting on each upper sloping side a 

 brachial plate, on which rest the arms proper. Interradial 

 and anal series consisting of about ten plates each ; the 

 lower one in each pentagonal, the second series hexagonal, 

 arranged in series of one, two, three, two, and two. The 

 dome is composed of small, polygonal plates, and sur- 

 mounted on one side of the anal area by a short, strong 

 proboscis. Plates of the body strongly tuberculous ; those 

 of the dome with less elevated tubercles. Arms un- 

 known. 



This is a strongly marked species, with a diameter (in 

 the larger specimens) of an inch and a half, and a height 

 of an inch to the top of the dome. It differs from all the 

 known carboniferous species of this country in tiie strong- 



