482 ON CAEBONIFEKOTJS ENCRIA^ITES. 



positively, but in any case it seems to me that the name Bhodocrinus 

 verus should be retained for the Carboniferous species, as that is 

 clearly what Miller intended. If, however, geologists generally 

 adopt De Koninck's view, I should propose that this be called 

 E. radiatus. 



EJiodocrinus verisimilis (Grenfell). {See plate VII. ^ jigs. 8, 9, 10.) 

 I have given the above name to a new species of Ehodocrinus 

 found with the last, which in many ways it closely resembles. Th^ 

 general arrangement and shape of the plates of the body agree with 

 Miller's detailed figure of the genus. The suh-radials are hexagonal 

 and wider than long. 



The radiaU are three, the first heptagonal ; second, hexagonal ; 

 third, normally heptagonal. They bear prominent longtitudinal 

 ridges like R. verus and stellart's, but in the present species these 

 are wider and flatter ; that on the second is wider in the middle, 

 and the prominences are continuous, not interrupted as in 

 R. stellaris. 



The arms are ten. The brachial plates five to the first bifurca- 

 tion ; the two lowest are hexagonal, and adhere to the calyx ; they 

 are short, wide, and flat ; are followed by three plates to the second 

 bifurcation, which are also short, wide, and flat ; after this the rays, 

 as in j8. verus, are composed of two series of joints, and are 

 tentaculated, still remaining comparatively broad for their length. 

 Total number of rays, forty. 



The shape and arrangement of the brachials closely resemble 

 those of £. verus {see plate VIL^fig. 10), and are important, as I 

 hope to show that they serve to separate these species generically 

 from Phillips' genus Gilbertsocrinus. The inter-radials have 

 triangular depressions at their angles, so as to form star-shaped 

 ornaments as in R. verus, but the centre of the star is here much 

 wider. The stem is cylindrical ; the joints alternately thicker and 

 thinner ; the alimentary canal small and circular ; the surrounding 

 fibriferous area is pentapetalous. Height of calyx, '38 inch ; 

 diameter, nearly "6 inch; length from the base to top of arms, 1*1 

 nch. One of the specimens in my collection, which is in bad 



