306 THE VOYAGE OF H.M.S. CHALLENGER. 
2. Pentacrinus miilleri, Oersted, 1856 (Pls. XIV., XV.; Pl. XVII. figs. 9, 10). 
1821. Pentacrinus caput-Medusce, Miller (pars), A Natural History of the Crinoidea, p. 46. 
1843. Pentacrinus caput-Meduse, Miiller (pars), Abhandl. d. k. Akad. d. Wiss. Berlin, 1843, p. 185. 
1845. Pentacrinus Caput-Meduse, Austin (pars), A Monograph of Recent and Fossil Crinoidea, p. 111. 
1856. Pentacrinus Miilleri, Oersted, Forhandl. Skand. Naturf., 7° Mode i Christiania, 1856, p. 202. 
1864, Pentacrinus Milleri, Liitken, Vidensk. Meddel. f. d. nat. Foren. i Kjgbenhavn, 1864, Nr. 13-16, p. 207. 
1865. Pentacrinus (Neocrinus) Miilleri, Wyville Thomson, Phil. Trans., 1865, vol. clv. p. 542. 
1882. Pentacrinus miilleri, P. H. Carpenter, Bull. Mus. Comp. Zodl., vol. x., No. 4, p. 170. 
non Pentacrinus Miilleri, Wyville Thomson, in Proc. Roy. Soe. Edin, vol. vii. p. 776; and in The 
Depths of the Sea, p. 442. 
non Pentacrinus Miilleri, Agassiz and Pourtalés, in Bull. Mus. Comp. Zodl., vols. v., vi. 
Dimensions. 
Total length of largest specimen,1 : E . . o2cm. 
Greatest length of entire stem, rounded off at sixbeaith nue, : ; . 185 mm. 
Shortest stem, rounded off at twelfth node, : : : : eels fi re 
Diameter of stem, 5 . : ; : : c 6°, 
Longest cirrus (forty-three joints); C 2 : : ; E ivionr. 
Diameter of calyx, ; : ; : , ; 3 elle 
Diameter of disk, 5 5 : : : ; : 14 ,, 
Length of arm (one hundred romtey : : : 5 IMU op 
Length of pinnule on first free brachial (fifteen seni) : ; : Sepa thsh Ao 
Length of pinnule from middle of arm (twenty-one joints), . - ORS, 
Stem robust, but of no great length. Outline pentagonal, with rounded angles and 
smooth surface. Internodal joints four to eleven (usually six to eight) in number, with 
but slightly crenulated edges, even in the upper part of the stem. Cirrus-sockets trans- 
versely oval and not reaching the upper edges of the nodal joints, but extending more or 
less downwards on to the infra-nodals, which are grooved to receive the cirrus-bases. 
Cirri composed of thirty to forty-five stout, smooth, and tolerably equal joints, the 
later ones of which may have a couple of small, blunt projections on the ventral side. 
Terminal claw small and without an opposing spine. Lowest limit of the interarticular 
pores between the fourth and eighth nodes. 
Basals variable ; sometimes pentagonal, forming a closed ring ; 
or rhomboidal, barely in contact by their lower angles; and sometimes quite small, not 
meeting at all upon the exterior of the calyx. Rays and their subdivisions not separated 
by perisome, but in close lateral contact, the joints as far as ‘the lowest free brachials 
beyond the tertiary axillaries having their sides more or less flattened, often very much 
so. The two outer radials united by syzygy. There are usually six or eight arms on 
sometimes triangular 
1 The total length of this individual, which was obtained by Captain Cole, and is now in the Natural History Museum, 
is slightly greater than that of the largest specimen dredged by the “ Blake.” The stem, which is 19 em. long, is broken 
just below the twenty-first node. But in the same bottle there is a fragment which appears to be the bottom part of 
this stem, and has the lowest nodal joint closed in the usual way. 
