REPORT ON THE CRINOIDEA. 



351 



stem, as may be seen by comparing figs. 5-7 and figs. 15-17 on PI. XLI. Tlic 

 whole stem of Metacrinus murrayi is slightly grooved along the interradial lines 

 (fig. 15), so that the pentagonal outline of the internodal joints has shallow re-entering 

 angles (fig. 17), while those of the nodal joints are sharper than in Metacrinus nohilis 

 (figs. 6, 16). The modification of the supra-nodals is about the same in both types, but 

 the infra-nodals of Metacrinus nohilis are more cut away to receive the cirrus-bases than 

 are those o{ Metacrinus murrayi (PI. XLI. figs. 5, 15). The internodes of the stem in 

 the latter species are slightly longer, and the interarticular pores reach farther from the 

 cup than in Metacrinus nohilis, but there are fewer joints in the primary arms, and the 

 dorsal edges of the pinnules are less serrate (PI. XLI. figs. 9, 10 ; PI. XLII. figs. 2, 3). Of 

 the two remaining species with smooth stems and four radials, Metacrinus superhus is 

 readily distinguished from Metacrinus mu7-rayi by the great size of the cirri and the 

 roughness of the arm-bases ; while the stem of the smaller Metacrinus varians has 

 considerably shorter internodes and nearly flat sides. 



The habitat of Metacrinus mvrrayi is unfortunately unknown, no record having been 

 kept of the Station at which it was dredged. It may perhaps be one of the two species 

 which are noted in Sir Wyville Thomson's diary as having been obtained at Station 210 

 (Panglao), no Crinoid having reached me with the label of this Station. On the other 

 hand, it may have been found at Station 192 (Ki Islands) or Station 214 (Meangis 

 Islands). A Cirripede attached to one of the cirri was identified by Dr. Hoek as 

 Scalpellum halanoides. This species is abundant at Station 192; and Dr. Hoek had 

 seen individuals from no other locality. Under these circumstances one would almost 

 have been justified in assigning Metacrinus murrayi to that Station ; but Dr. Hoek has 

 also recognised Scalpellum halanoides on a cirrus of Metacrinus varians which I sent 

 him from Station 214. Either of these Stations therefore, to say nothing of Station 210, 

 might have been the habitat of Metacrinus murrayi. 



4. Metacrinus nohilis, n. sp. (PI. XLI. figs. 5-11 ; PL XL HI.). 



Dimensions. 



Length of stem to twenty-fifth node, 



Diameter of stem, . 



Longest cirrus (forty-eight joints). 



Diameter of calyx, .... 



Diameter of disk, .... 



Length of arm (one hundred and twentv joints above tertiary axillary). 



Length of large distichal pinnule (twenty-three joints). 



Length of first pinnule after tertiary axillary (thirteen joints), 



28-00 cm. 



7 '00 mm. 

 46-00 „ 



9-00 „ 



21-00 ., 



125-00 „ 



27-00 „ 



14-00 „ 



Stem robust, A^dth a simple pentagonal outline and smooth, flat sides. LTsually ten or 

 twelve internodal joints, with slightly crenulated edges. Nodal joints bluntly stellate, with 



