00 



eggs, resembles, as regards the toothing, the male from Stat. 306, but there are not 4, but 

 only 3 small teeth on the upper margin between the 2"'i fixed tooth and the two approximate 

 distal teeth, while there are 18 teeth on the lower; the rostral formula is thus .5. The other 

 egg-beanng female differs from the other specimens l)y the presence of 6, instead of 5, 

 movable teeth on the frontal crest, so that the first fixed tooth, the largest of all and placed 

 above the orbital margin, is the j'h, instead of the 6"\ and furthermore by the lower margin 

 being armed with 15 teeth: the toothing-formula of this female is thus I'i. In the specimens, 

 collected by the "Challenger", the movable teeth of the frontal crest were 4 or 5 in number; of 

 the two first fixed teeth the anterior is described as the larger, while in the "Siboga" specimens 

 the anterior is the smaller: in Bate's figure 2^'=, however, the anterior tooth appears not larger 

 than the posterior. As regards the teeth of the lower margin, it should be remarked that the 

 1 5' is placed at the far end of basal antennular article, that the teeth, placed at the level of 

 the distal extremity of the antennal scale, are more closely-set than the proximal ones and that 

 beyond the antennal .scale the distances between the ventral teeth gradually increase. 



Antennal spine small, not reaching beyond the 2'"' joint of antennal peduncle, branchio- 

 stegal spine much smaller. 



Posterior border of 2,'"^ abdominal somite moderately produced. In the large ova-bearing 

 female the s'*' somite is 5,5 mm. long, the 6''' 8,5 mm., nearly one and a half as long as the 

 5''' and one and a half as long as high in a lateral view. Telson in this female as long as 

 5''' and 6"^ somite combined and as long as the outer uropods, in the other specimens the telson 

 is a little shorter than the two preceding somites taken together and even a little shorter than 

 the inner uropods. 



The eyes resemble the figure 2 a o( the Challenger Report. 



The antennular peduncle reaches to the middle of the antennal scale, 2"*^ and 3''' joint 

 subequal; stylocerite reaching, in the largest specimen, the ova-bearing female, to the middle 

 of 2""^ joint, flagella subequal, the longer nearly half as long as the body, rostrum included. 

 Antennal scale about half as long as the rostrum and four-fifths the length of the carapace, 

 measured dorsally; it is 4-times as long as wide and distinctly narrows distally, the outer margin 

 is slightly convex anteriorly and the .small terminal spine is much shorter than the obtuse tip 

 of the lamella. Antennal fiagellum a little longer than the body, rostrum included. 



The external maxillipeds which are provided with a small epipodite and with a well- 

 developed exopodite, extend by four-fifths their terminal joint beyond the antennal scale. 



The peraeopods of the i^' pair are, in the large female, hardly (only one millimeter) 

 shorter than the e.xternal maxillipeds and reach by a little more than their terminal joint 

 beyond the antennal scale; terminal joint (or propodus) slighdy more than half as long as the 

 carpus, terminating in a minute chela, that measures 7k, the length of the terminal joint. 

 According to Spence Bate the carpus of the 1^' pair should be on the right side longer than 

 on the left, in the five present specimens the two legs are equal. 



The peraeopods of the 2"^ pair are very unequal and in all the specimens the left 

 leg is the more slender and longer one; in B.vte's Report, however, the appendage on the 

 left side is described as the shorter and more robust one. In the egg-laden female, long 



