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viewed from the side, appear unequally bifid : on the front part of the well- 

 defined gastric region, on either side of the base of the rostrum, is a procumbent 

 acicular spine. Of the abdominal terga the third is of predominant size. The 

 angular abdominal pleura have the edge distantly and unevenly spinulate. The 

 telson is similar in shape and sub-equal in size to the lobes of the swimmeret. 

 The eye-stalks are very short — about half the length of the free portion of the 

 rostrum : the eyes are small, opaque, and deficient in pigment. 



The antennulary peduncles are between one-third and one-half the length 

 of the carapace : the sub-equal antennulary flagella are more than half as long 

 again as the entire animal. The basal joint of the antennas is spiny at the 

 antero-external angle, as is also the outer border of the broadly falcate antennal 

 scale, this last being more than half the length of the carapace and being fringed 

 with seta? of great length along its inner border. The mandibular palps are 

 incurved and 3-jointed. The external maxillipecls are pediform, and are hairy 

 along the inner edge : their segments are all simple and undivided, and their 

 tips reach to the end of the antennal scale. 



The thoracic legs are bilaterally symmetrical : the first three pairs are chelate 

 and have the carpus long, the first two pairs being very slender, and the third 

 pair also being slender as far -as the hands, which are enormously expanded. 

 Those of the first pair are not much longer than the external maxillipeds, those 

 of the second pair exceed by about one-third of their length those of the first, 

 while those of the third pair are longer by the extent of the dactylus than the 

 entire animal. In this pair the basis ischium and carpus are long and slender, 

 and the two last-named joints have both the inner and the outer border distantly 

 and sharply spinate, the carpus which is as long as the merus, becoming sud- 

 denly inflated at its distal end for the support of the huge hands : these hands 

 are symmetrical, but are not quite similar in every detail, the fingers of the 

 one beinc more closely apposable than those of the other. To describe them 

 more in detail — they form a good deal more than one-third of the entire extent 

 of the third pair of legs, and their greatest breadth, across the palm, is rather 

 more than the greatest breadth of the abdomen : the palms are compressed, 

 with the edges almost carinate and distally finely spinate : the fingers, which 

 are considerably longer than the palm and are also thin and compressed, have 

 their outside edges serrated in the proximal half, and the apposed edges smooth, 

 except for one or two coarse teeth, or tubercles, at the base : in one pair a large 

 tubercle on the propodite fits in between two large tubercles on the opposite finger, 

 while in the other pair — the pair in which the fingers can be completely apposed 



there is but one small tubercle on each finger. The fourth and fifth pairs of 



thoracic legs are slender, are about equal in length to the third pair min us the 

 hand, and end each in a simple claw-like dactylus : in both pairs the carpus 

 and propodite are obscurely subdivided, each into about 4 segments. 

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