292 REV. T. R. R. STEBBING ON STALK-EYED CRUSTACEA MALACOSTRACA 



a wrong view of the mandibles. Hodgson had already noticed the similarity between 

 his species and that of A. Milne-Edwards'. 



Here, as in various other instances, the armature of the upper and lower margins 

 of the rostrum seems to be so variable within each species that it is an unsafe guide 

 for specific distinction. 



Nauticaris brucei, n. sp. 



Plate XXIX. 



Along with a general resemblance to Bate's N. marionis, the present species 

 exhibits some rather notable differences in detail. In the first two specimens 

 examined the lower margin of the rostrum showed four teeth, but a third specimen 

 had only three. A fourth specimen had the hindmost tooth on the carapace more 

 remote from the succeeding tooth than in other specimens, a character for which 

 Bate named the species N~. unirecedens, mentioned above. The frontal margin of 

 the carapace in the new species has only the antennal tooth, without that of the 

 infero-lateral angle seen in 1ST. marionis and more conspicuously in N. magellanicus. 

 The eyes are much broader at the base than those figured by Bate for iV. marionis. 

 In the first antennae the stylocerite does not nearly reach the extremity of the first 

 joint. The three-jointed palp of the mandible is relatively much smaller than that 

 figured for the species compared. The first maxillipeds have the termination of the 

 endopod long and distinctly three-jointed, not a short simple process as figured by 

 Bate for N. marionis. For his N. australis Hodgson says, " The endopodite is a 

 two-jointed appendage with a terminal claw," and, judging by Mrs Sexton's figure, 

 this would seem very distinct both from the present species and from Bate's. In 

 the second maxillipeds the fourth joint, much shorter than the third, is quite distinct, 

 as the muscles sufficiently attest, but probably the differences in Bate's account of 

 his species are due to imperfect observation. The third maxillipeds have a slight, 

 easily detachable exopod. The slender second peraeopods have fifteen subdivisions 

 of the wrist, those at the base feebly indicated. The apex of the telson has a pair of 

 plumose setae between two long spines which are flanked by a pair of short ones. 

 Length of specimen figured in bent position 15 mm., straightened out over 20 mm. 



Locality. — Gough Island, depth 100 fathoms; Station 461. 



Specific name given out of respect to Dr W. S. Bruce, leader of the Scotia 



Expedition. 



Nauticaris magellanicus (A. Milne-Edwards). 



1891. Hippolyle magellanicus, A. Milne-Edwards, Mission de Cap Horn., "Crust," p. 46, pi. v. 



figs. 2, 2a-i. 

 1902. Merhippol gte magellanicus, Hodgson, "Southern Cross" Exp., "Crustacea," p. 235. 

 1906. Nauticaris magellanicus, Caiman, Ann. Nat. Hist., ser. 7, vol. xvii. p. 31. 



According to Calm an this species " differs from the other species of the genus in 

 possessing exopods on the third maxillipeds." As already observed, a rudimentary 

 exopod is found in the small new species N. brucei. Here the exopod, though short, 



