370 Mr. P. W. Bassett-Smith on 



marie out, probably the mandible and palp ; on either side a 

 little backwards are placed the two pair of maxillipeds, the 

 first are much the most slender, the second joint having- the 

 point somewhat sickle-shaped. 



The second maxilliped is very strong, the outer extremity 

 of the large muscular joint extending a little beyond the 

 margin of the cephalothorax ; the terminal hook-like joint has 

 a small tooth on the concave border about one third from the 

 point. Under the lower margin of the cephalic border are 

 seen the rudimentary first thoracic limbs; they are two- 

 branched and single-jointed, the outer branch being of a 

 square shape, having five short digitations with crenate edges 

 on the border ; the inner branch is very small, terminating in 

 a single short bristle. The rudimentary second pair of limbs 

 are placed a little further back and are much smaller than the 

 first, the outer branch carrying four small digitations only ; 

 on the inner I could see no bristle. The third pair of limbs 

 are converted into curved foliate processes as usual ; they 

 spring from the side and posterior border of the second free 

 thoracic segment ; these are very vascular and act as claspers 

 for the animal. The fourth pair of limbs rise on the side of 

 the abdomen from the last thoracic segment ; they quickly 

 become split into two processes, very long and narrow, their 

 length being greater than that of the whole of the rest of the 

 animal ; they are pale red in colour, pulsatile, and no doubt 

 act as branchiae, as Hesse suggests; they are in constant 

 motion, curling up and straightening out. 



Length without processes 5 millim., with processes 

 11 millim. 



Male. — Much smaller than the female, having the head 

 proportionally larger and more oval in shape. The body is 

 divided into two parts — the first is very short, carrying the 

 second pair of rudimentary thoracic feet : the second portion, 

 which is of a much more regular oval shape, carries on both 

 sides two pair of appendages, the first pair being single- 

 branched, springing from the anterior part, and equal in length 

 to that of the body ; the second pair are divaricate, proceeding 

 from the posterior part of the body, and much longer than the 

 anterior pair : between these is seen the genital segment, this 

 tapers considerably to the abdomen, which is oblong in shape, 

 terminating in two leaf-like caudal plates of almost equal 

 length with the abdomen, but rather less than half as broad. 

 The appendages are like those of the female, except that 

 the structure of the terminal joint of the first maxilliped'is 

 quite peculiar, being dilated along its concave border and 



