THE ANNALS 



AND 



MAGAZINE OF NATURAL HISTORY. 



[SIXTH SERIES.] 

 No. 57. SEPTEMBER 1892. 



XXII. — 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 Andrew Scott. 



[Plates XV. & XVI.] 



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

 (PL XV. figs. 1-14.) 



Description. — Length, exclusive of caudal setfe, 1*38 millim. 

 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 — 6 — 6—7 



— sparingly setiferous ; a small sensory filament springs from 

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

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

 length of the next two together and having the lower margin 

 produced forward into a digitlform 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 

 Ann. & Mag. N. Hist. Scr. 6. Vol x. 14 



