Two irregularities in the arrangement of the pinnules appear in this specimen. In
one case the sixth brachial is not free as it normally is, but is-united to the seventh ;
while the eighth is free instead of the ninth, and bears the first pinnule. In the other
ease the ninth brachial is not free as usual, but is united to the tenth, which bears a
pinnule, so that there are only two free joints, the third and the sixth.
In his first account of the Challenger species of Bathycrinus, Sir Wyville Thomson?
stated that “as the stalked Crinoids are perhaps the most remarkable of all the deep-sea
groups, both on account of their extreme rarity and of the special interest of their
paleontological relations,” he meant “to associate the names of those naval officers
who have been chiefly concerned in carrying out the sounding, dredging, and trawling
operations with the new species whose discovery is due to the patience and ability with
which they have performed their task.” In accordance with this idea Sir Wyville
established the new species Hyocrinus bethellianus and Bathycrinus aldrichianus ; and
he left the MS. names Bathycrinus campbellianus and Pentacrinus naresianus upon
the proofs of two of his plates. These names I have of course adopted. They refer to
Lieutenant Lord George Campbell, and to Admiral Sir George Nares, who commanded
the Challenger during the earlier part of the cruise.
1 Journ. Linn. Soc. Lond. (Zool.), 1876, vol. xiii. p. 47.
REPORT ON THE CRINOIDEA. 241
Bathycrinus aldrichianus, Wyville Thomson, 1876 (Pl. VIL; Pl. Vila. figs. 1-21;
fae Vili: Sun Wailer few ea):


Bathycrinus aldrichianus, Wyv. Thoms. (pars), Journ. Linn. Soc. Lond. (Zool.) (1876) 1878,
vol. xiii, pp. 47-51; The Atlantic, vol. ii. pp. 92-95, 1877.
Dimensions.
