124 THREE CRUISES OF TIIE “BLAKE.” 
specimen was attached to a piece of rock, and was not detected 
until it had become dry. The general shape is a contracted 
truncated cone, with irregular 
contour of attachment. The sur- 
face is granulated or shagreen- 
like, with a few small tubercles 
scattered over it. 
The great peculiarity of the 
Caribbean fauna is the abundance 
of ten-armed Comatulze representing both the principal genera. 
About two thirds of the Antedon species and three fourths of 
the Actinometre belong to this simple type. In this respect 
the contrast with the Comatula fauna of the Eastern seas 1s very 
marked. Ten-armed forms of both genera are there decidedly 
in the minority. 
Of all the Antedon species dredged by the Coast Survey ex- 
peditions, that with the widest range within the Caribbean Sea 
is the little ten-armed Antedon Hagenii Pourt. Tt was obtained 
by the “ Blake” on the Yucatan Bank, and also at various sta- 
tions between Dominica and Grenada, at dif- 
ferent depths between 75 and 291 fathoms ; 
while Pourtalès dredged it in great abundance 
at several localities in the Straits of Florida. 
Among the large number of individuals of An- 
tedon Hagenii from the Straits of Florida, Car- 
penter noticed a few examples of two new Ante- 
don species. One of them is distinguished by 
having enormous lancet-like processes on the 
lower joints of its oral pinnules ; while the 
other is a very exceptional type, with no pin- 
nules at all upon the second and third bra- 
chials, though those of the other arm - joints 
are developed as usual. This is a singular con- 
dition, which occurs but rarely among the Co- 
matule. Except in the remarkable type Atele- 
Fig. 416, — Ateleeri- erinus (Fig. 416), which has no pinnules at all 
mob. Samen) upon the ten or twelve lower arm-joints, these 
are the only Comatule which Carpenter has ever met with, in 
4 
E 
1 
Fig. 415. — Holopus Rangi. 1°. 
