TAKEN OFF NORTHUMBERLAND AND DURHAM. 219 



apex, fringed with a few short hairs, and bearing also three or 

 four long setae. Posterior footjaw (fig. ii) short and stout, 

 the hand ovate, and having a single marginal seta, terminal 

 claw short and strongly curved : first pair (fig. 12) of feet with 

 branches of equal length, their outer margins finely setose, 

 terminal claws long and slender : inner branches of the third 

 and fourth pairs (fig. 14) equal in length to the first two joints 

 of the outer branch ; inner joint of the second pair very robust 

 (fig. 13), outer apical angles of the first and second joints pro- 

 duced into strong spines, second joint bearing also two spine- 

 like setae, which are at least twice as long as the last joint : 

 last joint small, narrow, and tapered to the slightly hooked 

 apex. Caudal stylets (fig. 15) short and stout, bearing a 

 single long robust seta and three short ones, distal margins of 

 the last abdominal segment finely pectinated. 



The curiously robust and truncated character of the 

 antennules, together with the abnormally small number of 

 joints, induced the suspicion of mutilation or distortion of the 

 specimen, but the antennules of the two sides are precisely 

 alike, and have no appearance of injury : moreover the build 

 of the posterior footjaws and second pair of swimming feet 

 does not agree, so far as I know, with any described species. 

 The most closely allied forms seem to be Thalestris polaris 

 and T.fngida, described by Dr. Thomas Scott in his paper 

 on "The Crustacea of Franz-Josef Land."* 



I have pleasure in naming this species after Alderman 

 J. Dent, to whose generosity in many ways the naturalists 

 of Northumberland and Durham are greatly indebted. 



Genus ONCAEA, Philippi. 



Cyclopoid in shape : cephalothorax and abdomen of the 

 female five-segmented. Mandibles not hatchet-shaped, but 

 having a crest of teeth and bristles. Maxillae one-jointed. 

 Swimming feet with long slender internal branches, those of the 

 fourth pair half as long again as those of the first and second 

 pair combined. Fifth foot small, rod-, or knob-shaped. Mouth 



* Linnean Society's Journal — Zoology — vol. xxvii. 



