DESCRIPTION OF SPECIES 283 



sub-marginal ridges ; a pair of short sub-median ridges is also present ; the eyes are 

 rather small, reniform in shape and containing black pigment. 



The coxal plates, which are all fringed with long setae, are comparatively small and 

 are all separated from their respective thoracic somites by sutures ; in this species, as 

 Caiman points out, a vestige of the tergum and of the coxal plate of the last thoracic 

 somite may be seen on either side of the first abdominal segment. The coxal plates of 

 the seventh thoracic somite (sixth free) do not extend posteriorly beyond the base of 

 the terminal segment, which is broad, and extends laterally beyond the pleural plates of 

 the second and third abdominal segments. 



Remarks. The original account of this species does not include descriptions of the 

 appendages: a few notes on them are given here. 



The surfaces of both the antennules and the antennae are covered with minute rounded 

 scales. The first peduncular joint of the antennule is short, the second and third are 

 each about twice the length of the first ; the fourth is very small, being about half the 

 length of the first flagellar joint; the posterior margins of the second, third and fourth 

 joints are densely fringed with long setae ; the flagellum consists of nineteen joints. The 

 first three joints of the antenna are very short, the fourth is twice as long as the third, 

 and the fifth twice as long as the fourth ; the posterior distal angle of the fifth joint is 

 produced into a rounded process and its posterior border is fringed with long setae ; 

 similar setae are present in tufts on the anterior margin, and a group is also present on 

 the posterior distal angle of the fourth joint; the flagellum consists of nineteen joints, 

 the distal one of which is very small and bears a number of delicate setae. 



The mandibles are of the usual form ; the terminal joint of the palp bears the usual 

 type of setae, but these are absent from the second joint, their place being taken by a 

 few long simple setae which are scattered along its margin, as well as along that of the 

 basal joint. The form of the cutting edge of both the right and the left mandible may be 

 seen from Fig. 3 a. The outer lobe of the maxillula bears eleven strong spines on its 

 truncate distal extremity; the inner lobe is about two-thirds the length of the outer and 

 bears a single short seta on its much broadened distal end. There are two pectinate setae 

 on the outer and four on the inner lobe of the maxilla, and about twenty on the fixed lobe. 

 The maxilliped has its surface covered with minute imbricating scales ; the basipodite 

 is separated by a suture from the lamella, which is longer than broad with a concave 

 distal extremity ; the lower half of its outer margin is fringed with long hairs, whilst the 

 upper half is toothed : the inner margin of the basipodite is fringed with delicate setae, 

 scattered amongst which are stronger ones. The second joint of the palp is broad, whilst 

 the terminal joint is long and almost parallel-sided; setae are present on its rounded 

 distal extremity and on the upper inner margin of the second joint. 



The second thoracic appendage (Fig. 3 h) is short and robust ; the propodus is broad 

 and its inner margin is armed with a row of broadly rounded processes alternating with 

 a row of modified spines ; the distal edge of the carpus is crenulate and bears two short 

 stout spines. The third thoracic appendage of the male (Fig. 3 c) is considerably longer 

 than the second ; the propodus has its inner margin armed with a double row of spines 



