119 



middle of the front, posterior extremity only slightly contracted; seen laterally, 

 evenly vaulted above. Cephalosome about equalling in length the 3 succeeding 

 segments combined, and distinctly depressed in its anterior part, front somewhat 

 abruptly bent anteriorly, tentacular appendages very slender and extending obliquely 

 backwards. Lateral parts of last segment of metasome broadly rounded at the tip. 

 Urosome equalling about half the length of the anterior division, genital segment 

 fully as long as the 2 succeeding ones combined, and rather tumefied in the middle, 

 bulging considerably below, and having a slight dorsal depression behind ; posterior 

 edge of this and the 2 succeeding segments finely denticulate above. Anal segment 

 not widening at all distally, and on left side wholly confluent with the correspon- 

 ding caudal ramus, on right side only faintly defined. Left caudal ramus much 

 larger than right, both slightly attenuated, being cut off very obliquely at the end 

 in such a manner that only 2 of the marginal setse issue~from the tip, the other 

 3 from the outer edge ; outer apical seta of left ramus excessively prolonged, even 

 exceeding the whole body in length, and terminating in a very slender, hair-like 

 point. Anterior antennae about the length of the body, and having the 1st joint 

 rather large and compressed, equalling in length the 5 succeeding joints com- 

 bined, distal part very slender and generally extended directly laterally. Anterior 

 maxillipeds with the distal claws very strong, though not nearly attaining the 

 length of the stem. Posterior maxillipeds with a remarkably prolonged, subsigmoid 

 spine issuing from the middle of the 1st basal joint anteriorly. Inner ramus of 

 3rd pair of legs not attaining even y 3 of the length of the outer. Last pair of 

 legs with the outer ramus about twice the length of the inner, falciform spine 

 shorter than the terminal joint and extending almost straight inwards. 



Male somewhat more slender than female, with the urosome very narrow. 

 Left anterior antenna with the middle section but slightly tumefied, terminal 

 section very slender, and 4- articulate. Last pair of legs somewhat asymmetrical, 

 right leg with a large and abruptly curved, sausage-shaped prominence inside the 

 2nd basal joint, outer ramus rather strongly built, with the 1st joint remarkably 

 produced at the end outside, 2nd joint oval in form, with an irregular protuber- 

 ance inside, terminal joint but slightly exceeding in length the 2 preceding ones 

 combined, the apical part being quite short; outer ramus of left leg of about 

 same length as that of the right, terminal joint lamellar and produced at the tip 

 to a slender, somewhat flexuous spine of moderate length. 



Colour. Body highly pellucid, with a faint yellowish tinge, and exhibiting 

 within the anterior division a number of clear globular oil-bubbles. 



Length of adult female reaching to 4.20 mm., that of male about 

 the same. 



