Mr. C. Spence Bate on Eryoneicus. 457 
The second pair of antennez are scarcely longer than the 
first and carry a small scaphocerite and a long cylindrical 
phymacertte. 
The first pair of pereiopoda are long, and carry a narrow 
and slender chela; the second pair are much shorter than 
the first and are chelate ; the third pair are much shorter than 
the second and are also chelate ; the fourth are a little shorter 
than the third and are imperfectly chelate; and the fifth are 
still shorter than the fourth, and terminate ina simple dactylus. - 
Hryoneicus ccecus. 
Carapace orbicular, dorsal surface armed with long spine- 
like teeth that appear to be symmetrically arranged on each 
side of the median line. 
The pleon is also dorsally furnished with long and slender 
spine-like teeth, of which one is in the median line of each 
somite and one on each side, to the extremity of the telson, 
which terminates in a long and strong tooth. 
The eyes are wanting. 
The first pair of antenne have the flagella unequal; the 
second have a small scaphocertte and a long straight cylin- 
drical phymacerite. 
__ The second pair of gnathopoda are pediform, moderately 
long and slender. 
The first pair of pereiopoda are smooth, long, and narrow, 
the chela scarcely broader than the meros; the second pair 
short and spinous ; the third and fourth are still shorter, and 
so are the fifth or terminal pair, which are shortest and mono- 
dactyle. 
First pair of pleopoda wanting ; second and following ones 
biramose. 
The rhipidura symmetrical and distally fringed with plu- 
mose cilia. 
Telson terminating in a long and slender tooth, with a 
series of plumose hairs on each side. 
Length half an inch. 
Hab. Taken by the ‘Challenger,’ off the Canary Islands, 
at a depth of 1675 fathoms. 
This interesting little animal, having the dorsal surface ele- 
vated and carrying the pleon folded against the ventral surface of 
the pereion, has very much the appearance of a young Brachy- 
uran; but its true position is readily determined by the presence 
of the scaphocerites attached to the outer or second pair of an- 
tennee and the existence of the rhipédura or fan tail. 
The animal approximates closely to Pentacheles, and adds 
another link between that genus and Hryon. 
