REPORT ON THE CRINOIDEA. 339 



The second and third radials appear to be united by syzygy. The former are slightly 

 trapezoidal in shape, meeting one another more or less extensively by their lower angles 

 and then diverging. The axillaries are pentagonal, and scarcely Tvider than the second 

 radials, so that a considerable gap is left between the rays. This, however, is much wider 

 on the front of the calj^x than elsewhere, as will be evident from a comparison of 

 figs. 9 and 10 on PI. XXXIII. It is closed higher up by the approximation of tlie 

 first brachials of adjacent rays. Where they are properly visible they appear to have 

 the usual somewhat wedge-shaped form ; and the next joint was perhaps an axillary. 

 But the condition of the specimen renders the determination of the real nature of the 

 lower arm-joints entirely uncertain. From the mode of division of the ambulacra of the 

 disk, however, it would appear that there were twenty arms (PI. XXXIII. fig. 7). 



The colour is dirty brown with occasional patches of white, indicating the presence of 

 calcareous tissue. 



ioe«/;iy.— Station 235, June 4, 1875 ; lat. 34° 7' N., long. 138° 0' E. ; 565 fathoms; 

 green mud ; bottom temperature, 38°'l F. One mutilated specimen. 



Three much mutilated individuals of Eudiocrinus japonicus were obtained at the 

 same Station ; but they exhibit no trace of the extraordinary deficiency of limestone in 

 the skeleton which disting-uishes Pentacrinus mollis. The heisfht of the basals and the 

 pecuHar way in which they are received into a sort of cup formed by the uppermost 

 stem-joints distinguish this type very markedly from all the other Pentacrinidee. For 

 the stem-joints of this family usually decrease rapidly in size towards the top of the 

 stem, the upper ones being concealed within the concavity formed by the lower faces of 

 the basals, as is well show^n in PI. XXXIII. fig. 5. But it is of course possible that this 

 may also be the case even in the doubtfid Pentacrinus mollis, though on a smaller scale. 



Genus Metacrinus, n. gen. 



Characters of the Genus. 



The petaloid sectors of the faces of the stem-joints are bordered by a few large ridges, 

 of which the smaller proximal ones meet those of adjacent sectors in the interpetaloid 

 spaces, while the larger distal ridges reach the outer edge of the joint. The internodes 

 of six to thirteen joints. Nodals fully occupied by the cirrus-sockets which reach their 

 upper edge ; supra-nodals incised to receive the bases of the upturned cirri. These are 

 long, consisting of forty or fifty uniform joints, and vary but little in appearance. The 

 lower cirri often smaller than those about the twelfth node. 



Basals large, rhomboidal, or hexagonal, and in close contact. Then- lower angles are 

 generally distinctly produced downwards. Four to six radials, the second a syzygy and 

 bearing a pinnule, as do the remaining ones till just before the palmar axillary. The 



