REPORT ON THE CRINOIDEA. o51 
stem, as may be seen by comparing figs. 5-7 and figs. 15-17 on Pl. XLI. The 
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 nobilis 
(figs. 6, 16). The modification of the supra-nodals is about the same in both types, but 
the infra-nodals of Metacrinus nobilis are more cut away to receive the cirrus-bases than 
are those of Metacrinus murray? (Pl. 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 nobilis, but there are fewer joints in the primary arms, and the 
dorsal edges of the pinnules are less serrate (Pl. XLI. figs. 9,10; Pl. XLIL figs. 2, 3). Of 
the two remaining species with smooth stems and four radials, Metacrinus superbus is 
readily distinguished from Metacrinus murrayi 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 murray: 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 balanoides. 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 balanoides 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 murray?. 
4, Metacrinus nobilis, n. sp. (Pl. XLI. figs. 5-11; Pl. XLIIL.). 
Dimensions. 
Length of stem to twenty-fifth node, 3 : : 5 . 28°00 em. 
Diameter of stem, . : 5 : : : : 7:00 mm. 
Longest cirrus (forty-eight vomits c é : , : > » 46:005%; 
Diameter of calyx, . ; : : . E ; 4 9:00) 5 
Diameter of disk, . 3 5 210005, 
Length of arm (one hundred and Fn noite abies btary Sie, a EO) 
Length of large distichal pinnule (twenty-three joints), F : Fei AAO! 5 
Length of first pinnule after tertiary axillary (thirteen joints), 2 - ) 14:00),,; 
Stem robust, with a simple pentagonal outline and smooth, flat sides. Usually ten or 
twelve internodal joints, with shghtly crenulated edges. Nodal joints bluntly stellate, with 
