63 



middle is the longest and as long as the median spine; these three pairs of spines are movable 

 or perhaps the anterior one not. Along the posterior half of the telson 3 or 4 minute movable 

 spinules are inserted on each side laterally. In the adult male from Stat. 161 and in the adult 

 female froni .Stat. 87 the exopodite of the caudal swimmeret does not yet reach the acute 

 extremity of the telson, being i or 1,5 mm. shorter, but in the other specimens telson and 

 outer uropod are equally long. 



Though the tergum of the 1^' abdominal somite is not carinate in this species, I may, 

 however, remark that in adult specimens, like in that from Stat. 87, a feeble trace of a median 

 carina is sometimes observed on the posterior half of the tergum, that does not reach the 

 posterior margin. 



The pleuron ■ of the P' somite bears a fine furrow that runs, almost in the middle, 

 parallel with the anterior margin to near the lower; on the pleuron of the 2'"' somite two 

 similar furrows occur, of which the posterior runs parallel with the posterior margin, while the 

 anterior is more or less angular, both with the concavity turned forward ; on the pleura oC the 

 three following somites a fine furrow, defined by a ridge, runs, near the anterior margin, from 

 the lower border obliquely upward and forward to the anterior, the 6''' somite, finally, is smooth. 

 These furrows are pretty well visible in Fig. i of Plate III of the "Illustrations of the Zoology 

 of the Investigator", in which a male of the variety fimbriata is figured. 



The eye is dark purple and a little wider than the rest of the stalk ; the black ocellus 

 is situated on the upper side of the latter, one and a half times as far distant from the inner 

 than from the outer margin and only partially free from the cornea, about as in Acanth. Batei 

 Faxon (Challenger Crust. Macrura, PI. CXXVI, P'ig. da). There is a low obtuse tubercle on 

 the inner side of the eyestalk contiguous to the cornea, while the outer margin of the eyestalk 

 is slightly concave. 



The external maxillipeds that extend almost as far forward as the lower spine of the 

 rostrum, project in the male almost by the whole terminal joint, in the female by three-fourths 

 of it beyond the antennal peduncle. 



The P' pair of legs reach in the adult male by half the length of the chelae, in the adult 

 female only by the fingers beyond the antennal peduncle ; the fingers are nearly half as long as 

 the palm. The carpus of these legs is distinctly notched supero-internally near the distal extremity, 

 so that a small, acute tooth, which is turned inward, is formed on the distal border; in the 

 quoted figure of the "Illustrations" notch and tooth are distinctly visible, but in Bate's figure 

 2 of this species they are not indicated at all. The legs of the 2"'' pair, of which the chelae 

 are somewhat slenderer Init the fingers also half as long as the i.alm, arc but little longer, 

 projecting only by the fingers beyond the legs of the 1^' i)air. The legs of the 3"' pair are the 

 longest of all and reach by the dactyli beyond the external maxillipeds, those of the 4''' are 

 nearly as long as the 2"'^ while the legs of the last pair are hardly shorter than those of the 

 1^'. The meri of the three posterior legs are armed with small movable spinules on their lower 

 margin, 12 to 14 on those of the i'^ and 4''' pair, 4 or 5 on those of the last pair. 



The pleopods are of the ordinary form, in the male there are two stylets at the base 

 of the endopod of the 2"'' pair, in the female one: in two specimens of medium size, in which 



