32 



and gradually narrowed anteriorly, terminating in an obtuse point. Incubatory 

 pouch, when fully develoved, very broad, rounded quadrate in outline, with 

 the posterior edge slightly concave in the middle. Caudal rami rather slender, 

 sublinear in form, and more or less divergent, attaining nearly twice the length 

 of the anal segment, and more than 4 times as long as they are broad, both 

 edges distinctly ciliated; apical setae of moderate length and rather divergent; 

 bristle of outer edge occurring at a distance from the end equalling about Va 

 of the length of the ramus. Anterior antennae nearly as long as the cephalic 

 segment and rather thick at the base, but rapidly tapered distally, 3rd joint 

 the largest, the 3 succeeding joints gradually diminishing in size, remaining 

 joints very small; setae attached to the anterior face of these antennae rather 

 coarse and very distinctly ciliated. Posterior antennae moderately slender, with 

 the terminal joint about the length of the other 2 combined. 1st pair of legs, 

 as in the other species, differing from the succeeding ones by the presence, 

 at the inner corner of the 2nd basal segment, of a short deflexed spine; 

 rami moreover rather unequal, the outer one being considerably shorter than 

 the inner and bent outwards in a peculiar manner, its 1st joint comparatively 

 large and having the outer edge finely denticulate. Last pair of legs with the 

 proximal joint rather broad and finely denticulate at the inner rounded corner, 

 digitiform process considerably produced; distal joint small, scale-like and 

 conspicuously contracted at the base, spine of inner edge accompanied proxim- 

 ally with a few small denticles. 



Male of much smaller size than female, with the body gradually attenu- 

 ated behind. Cephalic segment comparatively larger, exceeding in length the 

 3 succeeding segments combined. Last trunkal segment scarcely broader 

 than the genital segment. Anterior antennae of coarser structure than in female 

 and only composed of 11 joints very unlike in size, the outer 2 rather 

 elongate and forming together a very mobile piece, which admits to be im- 

 pinged against the preceding part of the antenna. Posterior antennae, oral 

 parts, and legs of same structure as in female. Genital lobes contiguous at 

 the base inside, and subtriangular in form, their extremity somewhat truncated 

 and provided at the outer corner with a small bristle, at the inner with 2 

 unequal juxtaposed spines. 



Body in the living animal semipellucid, with a light yellowish gray hue; 

 ovarial tubes in female pale greenish, the ripe ova included within the incu- 

 batory pouch being of a somewhat darker green colour. 



Length of adult female attaining 4.50 mm; of male 1.90 mm. 



Remarks. This is the largest and also the most common of the species, 



