From the A-Nnals and Magazixe of Natural History /or 

 September 1892. 



On some new or rare Crustacea from the Firth of Forth. 

 By Thomas Scott, F.L.S., Naturalist to the Fishery 

 Board for Scotland, and Andeew Scott. 

 [Plates XV. & XVI.] 



Lichomolgus agilis, sp. n. (provisional name). 

 (PI. XV. figs. 1-14.) 



Description, — Length, exclusive of caudal setae, 1*38 inillim. 

 The cephalothorax, seen from above, is broadly ovate, com- 

 posed of five segments, the first being longer than the 

 combined length of the other four. Rostrum prominent, 

 produced downwards at nearly right angles and ending in a 

 sharp point. Anterior antennae scarcely half the length of 

 the first body-segment, seven-jointed, alike in both sexes, the 

 proportional lengths of the joints being nearly as in the 

 annexed formula — 



12—23—11—14—12—13—8 



1_2 — 3 — 4 — 5 — 6— 7 



— sparingly setiferous ; a small sensory filament springs from 

 near the base of the fifth joint (PI. XV. fig. 2). Posterior 

 antennee stout, four-jointed, the second joint fully twice the 

 length of the next two together and having the lower margin 

 produced forward into a digitiform process which extends 

 beyond the middle of the third joint ; the third and fourth 

 joints are short, the penultimate one being the shortest, while 

 the last joint is armed at the extremity with a moderately 



