58 ZOOLOGISCHE MEDEDEELINGEN — DEEL II. 



armata, the 5 th somite is not shorter than the 2 nd , in Call, vigilax the 

 2 nd appears distinctly longer than the 5 th , about one and a half as 

 long. The 3 rd and the 4 th somite show approximately the same relative 

 length as in Call, armata, the 3 rd measuring three-fourths of the 2 nd and 

 being one and a half as long as the 4 lb , which is half as long as the 

 2nd. While in Call, armata the 1 st somite appears only half as long as 

 the 2 nd , in this new species the 1 st somite is but little, viz. one -eighth 

 shorter. Different from Call, armata, the abdominal pleura appear dis- 

 tinctly less high, in a lateral view of the animal ; the convex posterior 

 margin of the pleura of the 2 nd somite makes an acute angle with their 

 lower margin, in the following somites this angle appears less sharp and 

 in the 5 tb it is rather obtuse. The concave posterior border of the 6 th 

 somite carries, on each side of the middle, two tufts .of long hairs, that 

 almost reach to the end of the telson, one at the rounded outer angle, 

 the other between this tuft and the middle ; there is also a tuft of hairs 

 on the pleura of the preceding somites. 



Telson short, not yet half as long as 6 th somite and nearly as long 

 as the 4 th ; it appears a little less broad with regard to its length 

 than that of Call, armata, the width being in proportion to the length 

 like 4:3, in Call, armata, however, like 4 : 2,35 according to Fig. 4 of 

 the original paper. The lateral margins diverge at first very slightly 

 backward, but soon curve inward converging to and passing into the 

 rather narrow, rounded, posterior margin; the posterior converging part 

 of the lateral margins appears about one and a half as long as the 

 anterior and both parts are very slightly concave. The posterior margin 

 is fringed with short hairs, hardly longer than 1 mm., but one observes 

 moreover at either angle a tuft of longer hairs that are 4 mm. long; 

 anteriorly and in the middle the upper surface is somewhat elevated 

 and from here it gradually slopes down towards the posterior and lateral 

 margins. Just in front of the middle the upper surface carries a tuft of 

 hairs that reach to the posterior margin. 



The basal joint of the uropods which are much longer than the 

 telson, terminates at its postero-lateral angle in two acute, though minute 

 teeth, situated close together and of which the outer is larger than the 

 inner. Outer uropod triangular, one-fourth longer than broad; anterior 

 margin somewhat S-like shaped, outer margin convex and passing with 

 an almost regular curve into the slightly convex inner border, almost 

 regular because there is a faint trace of an obtuse angle; both the outer 

 and the inner margin are fringed with hairs. The outer apical margin 

 bears a small notch somewhat nearer to the anterior than to the posterior 

 margin; from this notch a straight ridge runs to the basal joint and 

 this ridge is more prominent on the lower than on the upper surface, 



