14 



die away about the middle, and the hind part is only faintly 

 traceable. The internal submarginal carina runs from the 

 posterior angle of the carapace forwards to a point opposite 

 the base of the first pereiopods. It is more definitely spiny 

 than the other. 



The tergum of the first abdominal somite is almost quite 

 smooth, but on the second there is a well developed median 

 spine, and on the third, fourth, and fifth there are large spines 

 curving forwards. The sixth segment bears a low double keel 

 which is broken up into six or seven tubercles. 



The pleura of the first segment are the smallest, and those 

 of the second the largest of the series. The others diminish in 

 size and increase in sharpness from the third to the sixth. 



The basal part of the telson has a median row of three or 

 four tubercles. It tapers to a narrow but not very sharp point. 



The pigmentless and immovable eyestalks fill the deep orbits 

 in the front of the carapace. Each one gives off a tapering 

 branch on the outer side, which extends beneath the antero- 

 lateral angle of the carapace. There is a short spine on the 

 front of each eyestalk. 



The inner flagella of the antennules are longer than the 

 carapace ; the outer are very short and much thinner than 

 the others. The antennular scale extends far past the end of 

 the peduncle, and ends in a sharp point ; its inner margin is 

 armed with teeth. The outer angle of the basal joint of the 

 peduncle bears two prom.inent spines. 



The narrow antennal scale does not reach the end of the 

 peduncle. The flagelkim is slightly shorter than the inner 

 branch of the antennule. From the basal joint of th^ peduncle 

 there projects on the inner side a short rounded process, the 

 phymacerite or renal tubercle, the end of which lies in a hollow 

 on the under side of the base of the antennule. 



The cutting edge of the mandible bears about a dozen teeth, 

 of which one at each end and one in the middle are larger than 

 the others. There is a three- jointed palp. • 



The two lobes of the first maxillae are strongly incurved ; 

 they are Very slender, and end in sharp bristles, which are 

 stouter in the anterior one. 



In the second maxillae the two lobes are not subdivided, 

 but are long and slender, the inner larger than the outer ; the 

 scaphognathite is very large. 



The first maxillipedes are very lotig and of unusual form. 

 Fig. 7 shows the appearance of the anterior part without the 

 epipodal lamella, which forms a prolongation backwards, so 

 that the total length of the appendage is greater than that of 

 the scaphognathite. The two lobes of the protopodite are 

 represented by the parts a and h. From h there springs the long, 

 slender endopodite, heavily fringed with setae, and ha\'ing an 

 imperfect joint slightly nearer the tip than the base. The exopo- 

 dite, on the other hand, is very broad ; in its distal part it 

 divides into two curved plates which are curiously curled round 



