148 LIVERPOOL BIOLOGICAL SOCIETY. 
bearing two spines and a seta on each side (fig. 7) near 
the termination, and one spine and seta still lower 
down; very short terminal sete. Anterior antenne 
(fig. 2) six jointed, about as long as first body segment, 
and densely clothed with long wiry sete. Posterior 
antenne (fig. 1) very large, three jointed, and terminating 
in a strong curved claw; the three joints each bearing a 
strong marginal spine, the third also having three apical 
spines. The three first pair of swimming feet (fig. 4) are 
three jointed in both external and internal branches, the 
inner branch of fourth pair (fig. 5) having only one joint. 
The three first pairs (fig. 4) are remarkably spined 
throughout, and have two long terminal spines with the 
outer branch each doubly serrated; the segments of inner 
border of the outer branch and those of the outer border 
of inner branch have their edges clothed with fine short 
cilia. Fifth feet are wanting. 
Two specimens only of this remarkably distinct species 
were found both being together. It appears to differ from 
C. mirabilis, Dana, in several particulars. Its general 
appearance is more graceful and less angular than that of 
C. nurabilis, chiefly through the comparative smallness 
and frontal curving of first body segment; and both the 
antenne and also the swimming feet differ very con- 
siderably, those of C. bruci being more highly organised ; 
the dorsal median spines of last two thoracic segments, 
so conspicuous in C. murabilis, are in this species entirely 
wanting. 
I have named the species after Dr. Bruce, of Malta, to 
whom we are indebted for the mass of material upon 
which this report is drawn up. 
Oncea obtusa, Dana. 
This variable species, found in abundance further south, 
