480 OJf CAEBOKIFEKOUS ENCKINITES. 



its whole breadth ; from the third or axillary radial spring two rays 

 which, in one case, are both simple up to the seventh plate where 

 they are broken off ; in two other cases, one ray remains simple up 

 to the twelfth plate where it is broken off, while the other bifurcates 

 a second time after the third plate, and the two simple rays are 

 side by side with the divided rays outside. It is noticeable that 

 these extra rays do not occur on opposite sides of the anal plates as 

 if to protect that portion, as suggested by Major Austin in the case 

 of P. pentagonus. 



The first radial articulates to the second by two ridges. The 

 other two arms are wanting. The channel along the arms is very 

 wide and deep. 



The anal plates are five, arranged in two vertical rows as in 

 P. pHcatus ; the lowest is pentagonal, the rest hexagonal; all 

 their angles are depressed. {See plate VII., jig. 4.) The articula- 

 tions of the arm joints have an irregularly waved edge. 



The surface of the body plates is rough ; that of all the plates of 

 the arms is strongly wrinkled, especially at the sides. 



The third radial is remarkably wide in proportion to the calyx. 



This species resembles P. pentagonus and longidactylua (Austin) 

 in shape and general arrangement of parts ; it is well distinguished 

 from them by the depression of the angles and lateral articulations, 

 and by the roughness of the surface. The height of the calyx 

 is '3 inch ; diameter, '4 inch ; total length of the specimen as 

 figured, 1.3 inch ; width of third radial nearly -3 inch. 



Rhodocrinus verus QlLiWei). {See plate VII., figs, 6, 7.) 



I exhibit a fine specimen of this species from the lowest beds of 

 the mountain limestone already mentioned. The arrangement and 

 ornaments of the plates leave no doubt that this is the species on 

 which Miller founded the genus. The arms, however, were un- 

 known to him, and the column had not been found attached to the 

 head. 



The arms are ten in number. They bifurcate only once, so that 

 the number of rays is twenty. 



The brachials are six in number and adhere to the calyx ; above 



