UUMACEA. 175 



lip with incurved tips. Palp of maxillulae (fig. 81) not longer than the distance 

 between its base and the tip of the distal lohe, with two apical setae. Branchial 

 apparatus not examined. Second maxillipeds (fig. 82) rather short, basis hardly more 

 than one-third of the total length. 



Third maxillipeds (figs. 83) without exopods. The basis is curved, much expanded 

 distally and about equal in Length to the remaining segments together. At its distal 

 end it bears a series of very long setae. 



First legs (fig. 84) reaching beyond the tip of the pseudorostrum by about half the 

 length of the carapace. The basis rather short, less than two-fifths the length of the 

 remaining segments ; the distal segments stout, propodus a little longer than the 

 carpus and more than twice as long as the dactylus. 



Second legs (fig. 85) about as long as the third pair, basis enlarged, ischium 

 reduced to a narrow ring, distal segments not greatly elongated, propodus three- 

 fourths of the length of the dactylus, which is armed with two or three apical spines 

 and several seta?. Remaining legs (figs. 86 and 87) rather stout, successively 

 diminishing in length, merus much longer than carpus. 



Uropods (fig. 88) slender and elongate, peduncle twice as long as the sixth abdominal 

 somite, with six spines on distal part of its inner edge, two tubercles on its lower 

 surface and one above. Rami slightly unequal, exopod a little more than half the 

 length of the peduncle and a little shorter than the endopod, unarmed except for a 

 t\>\v minute setae and for a slender apical spine equal in length to the ramus carrying 

 it. Exopod of three segments, of which the first and longest bears two spines and 

 each of the others one on the inner edge ; distal segment ending in a slender apical 

 spine. 



No adult male is in the collection, but one or two immature male specimens, 

 resembling the female in general form and in the sculpture of the carapace, have the 

 antennular peduncle (fig. 79), and especially its distal segments, much enlarged, 

 suggesting that in the adult a modification of this appendage may take place similar 

 to that occurring in Leptostylis ; the outer flagellum also possesses an additional 

 segment not observed in the female. Two pairs of pleopods are present as rudiments 

 and both are bilobed. 



Locality. Gulf of Manaar, Cheval Paar, 7 fathoms ; several specimens. 



The most remarkable feature of the present form, and one which distinguishes it 

 from all Cumacea hitherto described, is the absence of an exopod from the third 

 maxUliped. The facility with which this appendage becomes detached in dissection 

 from the limb which carries it. might suggest possible error of observation on this 

 point were it not that I have observed the same character in an undescribed species 

 from New Zealand, closely allied to that above described. This character is so 

 unusual that it seems advisable to recognise it by establishing a new genus for the 

 reception of the species. 



The Leptostylis brevicaudata described by Zimmer (' Zool. Jahrb. Syst..' XVIII. , 



