236 



are observed, of which the inner is ha mmer-shaped with the handle directed backward and 

 slightly outward ; as regards the two lower spines and the tuberculation the pleurun of the 4 th 

 somite resembles that of the 3 rd , but the obtuse tooth at the end of the swelling is a little 

 more prominent. The mcdian part of the trifurcate crest on the 5" 1 tergum is widely inter- 

 rupted, the anterior part longer than the posterior and the lateral branches are fluted above; 

 a longitudinal row of 4 tubercles, of which the posterior is elongate, curved and as long as 

 the three anterior together, separates the tergum from the pleuron ; on the anterior moiety are 

 on each side 7 tubercles, firstly a larger oblong tubercle near the median crest, then follows a 

 longitudinal row of 4 tubercles and, finally, between this row and the boundary-row of the 

 pleuron still two elongate tubercles behind and close to one another. The pleuron bears 2 

 tubercles above one another, of which the upper is dentiform, subacute, and of the 2 spines in 

 which it terminates, the posterior is longer than the anterior. On the 6 th somite the median crest 

 is compressed laterally, its posterior extremity is sharp and it is divided in two parts, of which 

 the posterior is twice as long as the anterior; the lateral border of the anterior moiety of this 

 tergum is formed by two longitudinal sharp carinae, of which the posterior measures about two- 

 thirds of the anterior and situated immediately behind it, though a little more inward ; in the 

 adult specimen two small tubercles are observed behind one another, of which the posterior is 

 the larger, midway between the anterior part of the median crest and the longer border-crest, 

 but in young specimens the anterior moiety of this tergum is smooth. The much smaller posterior 

 moiety of the 6 th tergum is bounded laterally by a longitudinal crest, which is as long as the 

 posterior of the two that bound the anterior moiety and which posteriorly curves inward ; 

 between this crest and the median crest runs a longitudinal ridge, parallel with these crests and 

 placed somewhat nearer to the median crest than to the lateral or boundary one. The pleuron 

 is traversed longitudinally by a crest, which is obsoletely divided into 3 or 4 mostly inconspicuous 

 tubercles, while the terminal spine is directed backward. 



The telson, measured along the upper lateral edges, projects in adult specimens by one- 

 fifth, in young ones by almost one-third its length beyond the uropods; the tip is not or only 

 slightly turned upward, the upper surface faintly grooved, a rounded tubercle, ending in a small 

 sharp point, occurs at the base in the median dorsal line and the lateral edges are entire. 



Eyes in the adult blackish or mouse-coloured, in the youngest specimen of a drab tinge; 

 their major diameter measures in the adult one-fifth, in the youngest specimen one-sixth the 

 length of the rostrum, between the tip and the orbital margin-, a very small acute tubercle 

 exists anteriorly near the cornea. 



The antennular peduncle reaches usually by half its terminal joint beyond the antennal 

 scale, but in one female, which is 90 mm. long from tip of rostrum to tip of telson, the peduncle 

 is just as long as the scale; terminal joint half as long as 2 nd , both together only one-seventh 

 shorter than basal joint. Inner fïagellum as long as the peduncle, outer slightly shorter, the 

 two proximal third parts a little enlarged. 



The antennal peduncle extends to the distal fourth of 2 nd antennular article; the antenna 

 scale (Fig. 59^) measures almost half the length of the rostrum and is almost twice as long- 

 as broad, it shows its greatest width a little behind the middle, the inner margin is more 



