49 



margin till it meets the cervical groove. Starting from the same 

 point and keeping parallel to this ridge, but between it and the 

 margin, there is a shallow groove. 



The abdomen is of almost uniform breadth throughout, 

 narrowing very slightly about the fifth and sixth segments. 

 From the second to the sixth segment there is a low median 

 carina. The terga are all coated with a dense covering of setae. 

 They are sepamted from the pleura by prominent curved ridges. 

 On ^the first segment the pleura are very slightly developed, 

 but in the other segments they are large. On the second to the 

 fifth segments they taper rapidly downwards and are produced 

 into very long sharp points. Both anterior and posterior edges 

 are minutely serrate. Half Way down the anterior border of 

 the pleura of the second segment there is a single spine.* The 

 pleura of the sixth segment are much blunter than the others. 

 They have a sharp spine projecting backwards over the base 

 of the uropods. 



The telson is almost quadrate in outline, the posterior margin 

 being very slightly convex. On its surface there are two ridges 

 which diverge backwards and terminate at the external angles 

 in sharp spines. It is covered with short scattered hairs and 

 fringed with long setae on the posterior and lateral margins. 



The eyes are devoid of pigment and are very small. They lie 

 close together beneath the rostrum. 



The first and third joints of the peduncle of the antennules 

 are almost equal, the third being very slightly larger. The 

 second is about half the length of the third. The outer flagellum 

 is thicker and slightly shorter than the inner which is consider- 

 ably less than twice the length of the peduncle. 



The flagella of the antennae are extremely long, sometimes 

 nearly two and a-half times the total length of the bo4y. The 

 peduncle is equal to that of the antennules. The opening of the 

 renal tubercle is conspicuous on the lower side. The antennal 

 peduncle is practically hairless, but that of the antennules bears 

 heavy fringes of pinnate setae. 



The mandibles are massive, and have no toothed edge. There 

 is a three-jointed palp, the basal joint Very small. 



The first maxillae have a two-jointed palp, the distal joint 

 very much more slender than the proximal, at the base of which 

 there is a dense brush of setae. The inner edge of the upper 

 endite bears rows of strong teeth, and the lower one spines and 

 long pinnate setae. 



In the second maxillae the palp is very long, extending beyond 

 the tip of the scaphognathite. 



The endopodite of the first maxillipedes is two- jointed, the 

 iirst joint more than twice as long as the second. The exopodite 

 is very long and slender, and its distal part is multiarticulate. 

 The epipodite is large and foliaceous. 



*In a male specimen taken in 610-680 fms., at station S. E.. 331, each of the 

 pleura from the second to the fifth segment has two large spines on the anterior 

 t)order. In all other respects the specimen is quite normal. 



4 



