BARBADOS-ANTIGUA EXPEDITION 199 
It is not evident what dislodges such animals, as they are al- 
ways alive; possibly the incoming tide. We found them fairly 
swarming in certain favorable areas among corallines, which 
they like very much, especially the prevalent erect tufted or 
branched corallines. But they are even commoner under rocks, 
sometimes associated with the ‘‘sea centipede,’’ the abominable 
polychet with cactus-like sete, and several species of ophiur- 
ians. They are from three to eight inches in length. 
Holothuria grisea. A species whose predominating color is 
Indian red, marked off into patterns by dull greyish green 
spots, and with two longitudinal dorsal rows of dark reddish 
brown spots. Papille prominent; tentacles medium sized, yel- 
lowish with brown ends. This form is found under rocks just 
below high tide, and is apparently nocturnal. It is usually 
soiled by mud so that one has to scrub it more or less to get the 
bright colors. Its wart-like pointed papille are conspicuous. 
This form is very sluggish in the daytime, especially when the 
tide is out, but rather restless at night when in the aquaria; 
active for a genus which is never given to roving. I found 
one or two in the eel-grass in very shallow water in English 
Harbor, along with Stichopus mobi. 
Mollusca.—The following notes are furnished by Mr. Hender- 
son and are here repeated almost verbatim. 
The shore-station conditions in Antigua are very different 
from those at Barbados. In the former are many bays from the 
partially to the wholly protected kinds, within which the quiet 
warm waters, muddy bottom, and stretches of mangrove shores 
offer types of environment not existing at Barbados. We did 
not, however, find the floor of either English Harbor or the ad- 
joining Falmouth Harbor very productive. A few common and 
widely distributed small bivalves and the usual assortment of 
Bullina, Cerithium and Modulus appear to be the sole molluscan 
inhabitants of English Harbor, save upon the sea-wall of the 
old Navy Station and among the rocky debris of a coral reef at 
the harbor entrance. Living on the wall mentioned we found a 
remarkable colony of the very beautiful Murex brevifrons Lam. 
We took about two hundred of them in a space of fifty to sixty 
yards. This particular Murex is scarcely to be distinguished 
from certain Indo-Pacific forms and is one of the really fine 
