154 
ME. I. C. THOMPSON ON THE COPEPODA OF 
antennae (fig. 9) two-branched, the first being 3-jointed and 
terminated by two long lancet-shaped spines ; the second has 
one joint, and is terminated by a long sword-shaped spine. 
First and second foot-jaws (figs. 10 & 11) each have a long apical 
claw, the first is composed of two, the second of four joints. 
First four pairs of swimming-feet nearly alike, both branches 3- 
jointed (PI. XIII. fig. 5); base and second joint of chief branch have 
very fine serration on inner edge formed by minute hairs. Fifth 
feet (PI. XIII. fig. 6) are composed of two stout joints, the outer 
bearing a number of long setae, some of them plumose ; the outer 
edge of both joints has fine hairy serration. Caudal segments and 
terminal setae are the same as in A. scutatus. 
Siphon very long and slender, reaching to the ends of caudal 
segments. 
One specimen only of this new species was taken at Funchal 
Bay, Madeira. The angular shape of the posterior segments of 
the cephalothorax readily distinguish it from A. scutatus, which 
it resembles in general characters. 
Artotrogtts Nokmani, JBracly <Sf liohertson. 
Found very sparingly. 
Cimeasoma, n. gen. 
Cephalothorax elegantly boat-shaped, 4- to 6-jointed ; head 
united with thorax. Anterior antennae 5- or 6-jointed, broad 
and muscular. No posterior antennae or foot-jaws. First four 
pairs of swimming-feet have a large basal joint, the two branches 
being each 3-jointed and terminated by strong spinous setae. 
Abdomen in female 2-jointed, the first much larger than the 
second ; and from the centre of the latter are attached the ova on 
long narrow branches. 
Cymbasoma rigidttm, n. sp. (PI. XIII. figs. 1-4.) 
Length ^ inch. First joint of cephalothorax (fig. 1) equal in 
length to the succeeding five, the last being much smaller than 
the others, and appearing as though part of the abdomen. Eyes 
long and kidney-shaped, with conspicuous brain below r . Ante- 
rior antennae (fig. 2) about eight times as long as broadest part, 
and terminated by two claw-like spines ; the inner side of each 
antenna has five hooked spines (fig. 2). From tw r o raised circum- 
ferences near the centre proceed long spinous setae, and several 
smaller setae are situated near the apical portion of the antennae. 
