199 



the length of the second which is considerably the longest : the second, which 

 is half the length of the carapace (rostrum included), has its postero-lateral 

 angles spiniform : the third to the sixth inclusive all have on either side, near 

 the antero-lateral angle, a sharp recurrent declivous spine (rudimentary pleura) : 

 the third, fourth and fifth are broad, the sixth is long and narrow : the telson 

 which is as long as the sixth tergum, and about as long as the caudal swim- 

 merets, has its sides convergent and its tip broad and blunt; the caudal 

 swimmerets are broadly foliaceous, the outer being the larger. 



The eyestalks are of the usual petaloid shape, and, as already mentioned, 

 are devoid of any trace of a cornea. 



The antennular peduncle, of which the middle joint is the shortest, is about 

 two-thirds the length of the upper antennular flagellum ; this, which is stouter 

 and slightly longer than the lower flagellum, is about half the length of the 

 carapace. 



The external maxillipeds are compressed and broadly pediform — the ischium 

 having its inner basal angle produced to form an operculum : the dactylus is a 

 large, almost circular, plate, thickly beset with hairs. Of the first pair of thoracic 

 legs the right is many times larger than the left, its length, more than half of 

 which is hand, being equal to that of the carapace and first four abdominal 

 somites combined : the ischium is spinate along its lower edge : the merus has 

 a single claw-like spine at its proximal end : the carpus is considerably less than 

 half the length of the palm of the hand, and has two small spines at its much 

 produced lower angle : the hand is longer and broader than the carapace, ths 

 palm is carinated along both the upper and the lower edge, the lower ed°-e bein°- 

 also finely serrated : the dactylus, which is longer than the fixed finger, is equal 

 in length to the palm, is broadly flanged, both outside and inside, above, and 

 has, on its cutting surface, at the proximal end, two short rows of coarse crenu- 

 lations, the outer of which is continued into a sharp-edged rid^e : the fixed 

 finger has at its base, in the finger-cleft, a strong sharp tooth. 



The smaller cheliped of the first pair resembles its fellow as to the ischium 

 and merus ; but the carpus is more than - the length, and the fingers nearly twice 

 the length, of the palm : the fingers, besides being relatively much longer, are 

 also much straighter, and, except for a single large tooth at the base of the 

 fixed finger, are unarmed. 



The 2nd-5th pairs of legs, which have stoutish compressed joints, are of 

 about equal length. Those of the 2nd pair are about as long as the carapace 

 and end in a short broad compressed hand, the edges and outer surface of which 

 are setose, as also are the inner border of the merus and the upper and distal 

 borders of the carpus. In the 8rd-5th pairs the small dactylus is much hidden 

 in setae, especially in the case of the imperfectly-subchelate 5th pair, in which 



