BARBADOS-ANTIGUA REPORTS 51 
‘“Each facet is traversed by a transverse articulating ridge, 
a little in front of which there is the mouth of the tube which 
lodges the sarcode axis of the ossicles, and a little behind its 
center there is a somewhat longer aperture which appears to 
lead into the cancellated structure of the outer part of the 
wall. There are two large shallow muscular impressions on the 
surface of the facet on the proximal aspect of the transverse 
ridge. A vertical mark, sometimes a groove and sometimes a 
ridge, runs from the center of each articulating facet down the 
inside of the wall of the hollow column for about two-thirds of 
the depth of the cavity, where it is lost. At the bases of the 
arms, just above the edge of the cup, five thick caleareous boss- 
es, each composed of the contiguous lateral processes of two 
axillaries, project interradially into the cup, and opposite these 
five rather large triangular plates meeting in the center of the 
disc, form a low pyramid covering the mouth; these oral plates 
are inter radial, and the spaces between them radial, corres- 
ponding with the arm grooves.’’ 
Sir Wyville notes thet d’Orbigny describes the animal as 
possessing no anal opening, and says that this is probably the 
ease, ‘‘but the material is still too scanty to admit of the full 
examination of a complete specimen of the skeleton, and the 
soft parts are unknown.”’ 
Sir Wyville concludes that Holopus is especially characterized 
among living crinoids by the absence of an articulated column, 
or its representative, the centrodorsal; by the viscera being 
lodged in a hollow peduncle with a continuously calcified wall; 
and by the absence of an anal opening. The similarity of 
Holopus and Cyathidium, between which types he sees no dis- 
tinction of generic value, is noted. 
In 1878 two figures drawn by J. Henry Blake from prelimi- 
nary sketches by Alexander Agassiz of a young Holopus dredged 
in 100 fathoms by the ‘‘Blake’’ off Bahia Honda, Cuba, in 23° 
01’ N. lat., 83° 14’ W. long., were published, together with a 
descriptive note by Count Pourtalés.® 
Pourtalés says: 
‘The specimen is attached to a piece of rock, and was not 
detected until it had become dry. The general shape is a trun- 
eated cone when contracted, with irregular contour of attach- 
ment. The body part is very short, spreading out a little at 
the foot; surface granulated or shagreen-like, with a few small 
6 Bull. Mus. Comp. Zool., V (1878), p. 213. 
