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calcified as the rest, and is almost transparent. A median 

 groove bounded by two ridges runs down the middle. There 

 is also another ridge exterior to this on each side, and these 

 converge and meet near the bas2 of the telson. 



The eyes are very minute and almost completely hidden by 

 the rostrum. They are only slightly pigmented. 



The antennules arise close together just under the rostrum., 

 which is about one third as long as the peduncle, reaching to 

 about the middle of the second joint. The first joint is the 

 shortest, and the third the longest ; it is about two and a half 

 times as long as the second. The two flagella are each about 

 as long as the third peduncular joint. They are both slender, 

 but the outer one is slightly thicker, and very slightly longer, than 

 the inner. The former bears a fringe of setae, and is composed 

 of about twenty joints, the latter of fourteen or fifteen. 



The peduncle of the antennae is five-jointed. The first three 

 joints and the last are short, but the fourth is Very long, longer 

 than all the others together. The third joint lies partly hidden 

 on the inner side of the second and fourth, and is not easily 

 seen except from below. At the upper distal end of the second 

 joint there is a broad, slightly -movable process which may 

 represent the scale. In profile it appears as a sharp thorn. Its 

 anterior edge bears two or three small teeth. The first joint 

 also bears a pair of small teeth at its interior lower angle. The 

 peduncle is longer than that of the antennules. 



The mandible has a three-jointed palp, and a cutting edge 

 furnished with sharp teeth. 



The first maxillae have a long slender palp divided into 

 two joints, the distal one much more slender than the proximal. 

 The two inwardly -turned endites are fringed with teeth, which 

 are very long and curved in the proximal one, and short and 

 straight in the distal one. 



At the posterior trancated end of the scaphognathite of 

 the second maxillae there are three or four setae which are 

 longer than the scaphognathite itself. There is a slender 

 endopodite. 



The first maxillipedes have a two-jointed endopodite, the 

 distal joint of which is broad and expanded. The exopodite 

 has a well-developed flagellum, which reaches beyond the tip 

 of the endopodite. There is a large broad epipodite and a small 

 podobranch. 



The exopodite of the second maxillipedes is long, and bears 

 a flagellum reaching beyond the endopodite. The epipodite 

 is long and slender, and its margins bear delicate teeth. There 

 is a large podobranch. The merus is the longest joint; all the 

 others are uniformly short, and the propodite is greatly broadened 

 by an expansion on its outer side. 



The third maxillipedes are long, slender, and pediform. The 

 exopodite is not so long as the endopodite. There is a long 

 epipodite bearing small marginal teeth and giving off a slender 

 process near the tip. There is a fair-sized podobranch. The 



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