116 MR. F. E. BEDDARD ON ISOPODA COLLECTED [Feb. 2, 



Leiopus, nov. gen. 

 This genus is closely allied to the last, but differs in that the 

 chelipeds and fossorial limbs have an exopodite. The chelipeds are 

 extremely slender and delicate in their structure, and this, together 

 with the characters of the abdominal appendages, serves to distinguish 

 the genus from Apseudes. 



1. Leiopus leptodactylus, n. sp. 



This species attains to a length of 13 millim. 



The cephalothorax is prolonged in front into a long rostrum ; the 

 ocular lobes are large and pointed anteriorly ; there is no trace of 

 any optic structures ; behind the ocular lobes are two long spiny 

 processes, one on either side. The first free segment of the thorax is 

 as wide as the cephalothorax ; the following segments decrease in 

 width, the first suddenly, the rest more gradually ; the length of 

 these segments increases up to the fourth ; the fifth is of equal 

 length with the fourth, the sixth rather shorter ; the first segment 

 has well-developed spiny epiinera ; the last three segments of the 

 thorax have also short spines upon the epimera, which are wanting 

 in the intermediate segments ; upon all the free thoracic segments, 

 with the exception of the first, are a i)air of long lateral spines like 

 those of Ti/phlapseudes, but longer. On the ventral surface of both 

 the thoracic and abdominal segments, with the exception of the last, 

 is a median spine. The abdomen is much as in the last-described 

 species. The outer flagellum of the antennules has twenty-seven 

 joints, the inner only six. The antenncB have a rudimentary exopodite. 

 The chelipeds are very slender and delicate. The uropoda are as in 



Station 78; 1000 fathoms. 



Fam. T A N Ai DiE. 

 Genus Tanais, Audouin & Milne-Edwards. 



1. Tanais hirsutus, n. sp. 



The extreme length of this species is 9 millim. 



The body is elongated, the anterior region is wider than that which 

 follows ; the last thoracic segment and the first three abdominal 

 segments are again wider, after which the body narrows towards the 

 termination. The cephalothorax has a sliort obtuse rostrum ; the 

 two first segments of the thorax are short and subequal, the third 

 segment is narrower but longer ; the two following segments increase 

 progressively in length, the first is about twice the length of the 

 preceding segment; the last thoracic segment is wider than the 

 preceding, but shorter. The first three segments of the abdomen 

 are wider as well as longer than the following; the terminal segment 

 ends in a blunt, rounded extremity. The antennules have a three- 

 jointed peduncle and a two- or three-jointed palp ; the extremities of 

 the joints of the peduncle are surrounded by a circle of fine delicate 

 plumose hairs of great length. The antennce are similarly beset 



