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could not be ascertained; the terminal seta is rather long. The mouth is rather large; the 

 mouth-border of medium breadth; the maxillaB provided with a well developed additional 

 branch. The maxillae moderately large, the distal margin of the basal joint is furnished with 

 hairs along the larger part of the articular membrane (fig. 3 c). The maxillipeds (fig. 3 f) 

 scarcely of medium length, all joints separated, the basal joint somewhat clumsy, provided 

 at its distal margin with a few short rows of hairs, a similar row a little outside the middle 

 of the inner margin, and a tuft at the same distance from the base on the opposite margin ; 

 the terminal joint ending in three points. The sub-median skeleton between the rostrum and 

 the maxillipeds consists of a pair of moderately narrow lists on each side; the skeleton 

 between the maxillas and the maxillipeds has a long transverse belt of hairs, some of which 

 are long (in fig. 3 d the hairs are only drawn on one half of the head.) The lateral margin 

 ,of the head, as far forward as somewhat behind the base of the antennulae, is furnished with 

 numerous moderately long hairs, a little outside of which another row of similar hairs, ad- 

 vancing forward outside the base of the antennulae to somewhat in front of it. The trunk 

 is closely covered all over with short, most peculiar hairs, each of which is divided from its 

 base into three branches, the central one of which is double the length of each of the other 

 two. Trunk-legs are found. The genital area is much narrower than the head, it is as 

 long as bi'oad (fig. 3 g) and solidly chitinised all over ; the oblique genital apertures are 

 rather far apart, the caudal stylets situated close together between the distal parts of the 

 genital apertures. The whole genital area is almost naked, except some rows of normal, 

 fine hairs between the genital apertures, furthermore, a crescent-shaped area in front of and 

 outside the anterior half of the genital area is likewise naked, whereas the peculiar hair- 

 covering of the posterior part of the trunk extends up to the caudal stylets and to the 

 posterior extremities of the genital apertures. 



MALE. A large male is '30 mm. in length, whereas an abnormally small, probably 

 far from adult specimen is only - 182 mm. long; the proportion between length and breadth 

 is approximately as 4 to 3. So the male is very small in proportion to the adult female 

 (fig. 3 b : fig 3 a). The head is about the size of the trunk (fig. 3 h and 3 i). The frontal 

 border is very considerably produced, and its margin furnished with a row of fine, very 

 short hairs; it is crenate, being divided into three pairs of rounded lobes, the outermost 

 pair of which is much lower and broader than the others. The antennulse much like those 

 of the female. The antennae short, having at least two joints; terminal seta long. The 

 rostrum, maxillulae and maxillae nearly similar to those of the female. The maxillipeds 

 differ from those of the other sex in having the basal joint longer, more slender and almost 

 naked. The sub-median skeleton without processes and naked. The lateral margin of the 

 head fringed with hairs of medium length, and a little in front of the posterior end of the 

 margin originates a very narrow stripe of long hairs, which runs upward across the side, 

 and further in a somewhat oblique line a little backward across the back of the animal, the 

 hairs being exceedingly long in the dorsal part of the stripe. Behind this stripe, the back, 



15* 



