KEMP—PELAGIC CRUSTACEA DECAPODA 59 
The principal characters of the two male specimens are as follows :— 
In the cephalothorax the neck is about one-quarter longer than the thorax. At the 
junction of the two there is a prominent outstanding spine on either side, and at the 
extreme anterior end there are five spines, one representing the rostrum, one behind each 
eye, and one at each antero-lateral angle. 
The eyes are club-shaped and, apparently, of somewhat variable size. In the two 
specimens their length is contained respectively four and three-quarter and five and 
a half times in the length of the cephalothorax. They are a little shorter than the basal 
antennular segment. 
The second segment of the antennular peduncle is about one and a half times the 
length of the third; the antennal scale reaches to the middle of the former segment. 
The last pair of pereeopods reaches to, or slightly beyond, the anterior extremity of the 
cephalothorax. 
On the first abdominal somite there is a pair of stout outstanding spines situated 
subdorsally close to the cephalothorax, and there is a similar but more slender spine on 
either side of the first five somites at the base of the pleopods. All these spines are 
conspicuous in dorsal view. The sixth somite is a little shorter than the two preceding 
taken together. It terminates dorsally in a sharp spine, and on its inferior margin bears 
two large teeth, the first of which, situated in the middle of the ventral margin, is smaller 
and more sharply pomted than the posterior. Behind the latter tooth there is a pair of 
small and very sharp spinules. 
The telson reaches to about half the length of the outer uropod and is provided with 
a prominent rounded lobe on its inferior aspect, a little behind the middle point. The 
telson bears two pairs of dorsal spinules, the anterior being situated immediately above 
the proximal edge of the ventral lobe. The apex is slightly concave, with a long spine at 
each outer angle and two shorter pairs between them, the median pair being the shortest. 
There are minute prickles on the inner side of the outer spines and on both sides of the 
two inner pairs. 
The inner uropod reaches to a point midway between the apices of the outer uropod 
and telson. The outer uropod is a little more than five times as long as broad, and 
the spine which terminates the outer margin reaches well beyond the apex of the 
lamella. 
The specimens measure about 8°5 and 9 mm. respectively from the tip of the eye to 
the apex of the outer uropod. 
The single female is of considerably larger size, measuring 12 mm., and differs in 
several details from the male. The eyes are decidedly smaller, their length being 
contained six times in the length of the cephalothorax. The sixth abdominal somite 
is unarmed below, except for a pair of fine spinules in the same position as those found in 
the male. The distal armature of the telson exactly resembles that of the male; the 
outer uropod has the same proportions, but the spine on the external margin does not 
surpass the apex of the lamella. 
The specimens differ from Dana’s description of individuals from the Sooloo Sea 
in having the cephalothorax proportionately shorter; the pereeopods, moreover, are 
8—2 
