CRUSTACEA FROM EAST COAST OF SCOTLAND 151 



broad and foliaceous more so in the female than the male, 

 as shown in the figures (Figs, i o and i i ). 



Habitat. Aberdeen Bay. Several specimens were 

 obtained in bottom-townet material collected in 1891, but 

 only a few of them were mature. 



Lichomolgns aberdonensis resembles in general form and 

 structure the species described in the " Tenth Annual Report 

 of the Fishery Board for Scotland " under the name of 

 Lichomolgns littoralis, but differs from it in several important 

 points, as in the proportional length of the joints of the 

 anterior and posterior antennae, in the form of the posterior 

 foot-jaw and fifth pair of feet, and in the proportional length 

 of the segments of the abdomen. 



Liehomolg'us arenicolus, Brady (Plate VII. Figs. i-io). 



1872. Boeckia arenicola, Brady. "Nat. Hist. Trans, of 

 Northumberland and Durham," vol. iv. p. 430. 



1880. Lichomolgus arenicolus, Brady, " Mon. Brit. Copep." 

 vol. iii. Plate LXXXVII. Figs. 1-7. 



Female. Length, exclusive of tail setae, 2*3 mm. An- 

 terior antennae not more than half the length of the first 

 body segment, and composed of six joints, which are all 

 more or less setiferous ; the proportional length of the joints 

 are nearly as in the formula : 



ii 18 6 14 12 17 

 i 2 3 4 5 6 



Posterior antennae stout, four-jointed ; the first two joints 

 short, the third about twice the length of the second, and 

 the last about two-thirds the length of the preceding one. 

 The last joint is armed with three stout terminal clawed 

 spines, which are elongate, and distinctly articulated and 

 swollen near the middle the distal half being strongly 

 curved and claw-like. There is a fourth terminal articulated 

 spine, but it is more slender and less curved than the other 

 three (Fig. 3). Mandibular stylets two, the upper one 

 provided with a row of marginal teeth, the first two of 

 which are large, while the others gradually decrease in size 

 towards the distal end. The lower stylet bears a number of 

 fine hairs on its upper margin (Fig. 4). The maxillae 

 consist of a broad laminar plate rounded at the end, and 



