594 



8. Podocerus falcatus, (Mont). 



(PI. 212). 

 Cancer (gammarus) falcatus, Montagu, Transact. Lin. Soc. IX. p. 100, PI. 5, figs. 12. 



Syn : Jassa falcata, Leach (<j< jun). 



> Jassa pulchella, Leach (<j* adult). 

 Jassa pelagica, Leach (9). 

 Podocerus pulchellus, M- Edw. (cf). 



> Podocerus calcaratus, Rathke (<j<). 

 Podocerus pelagicus, Sp. Bate (9)- 



Body in female somewhat tumid in its anterior part, with broadly 

 rounded back, in male far more slender and compressed. Cephalon witli 

 the frontal part rather produced and attenuated, lateral lobes small, 

 rounded. Coxal plates in female scarcely deeper than the body, in male 

 somewhat larger and broader; 1st pair angularly produced in front; 2nd pair 

 transversely oval, lower in front than posteriorly ; 5th pair with the anterior 

 lobe not as deep as the preceding pair, and evenly rounded. Last pair of 

 epimeral plates of metasome with a minute dentiform projection at the lateral 

 corners. Eyes small, rounded, placed near the lateral lobes of the cephalon, 

 pigment dark. Superior antennae not attaining to half the length of the body, 

 2nd joint of the peduncle the longest, 3rd joint much longer than the 1st, 

 flagellum scarcely half the length of the peduncle, and composed of 7 8 

 articulations, accessory appendage extremely small. Inferior antennae consider- 

 ably longer than the superior and also much more strongly built, especially in 

 the male, last joint of the peduncle having, in addition to the usual fascicles of 

 setee, a dense clothing of short ciliated hairs, partly continued on the flagel- 

 lum, this being rather robust and 6-articulate, terminating with several small 

 hook-like spines. Anterior gnathopoda of same structure in the 2 sexes, 

 propodos oval in form, with the palm straight, and defined by an obtuse angle 

 carrying several short spines. Posterior gnathopoda in female much . stronger 

 than the anterior, with the propodos very large and irregularly oval in form, 

 palm occupying the greater part of its length, and defined posteriorly by a 

 projecting corner armed with 2 strong spines, its edge bisinuate, with a 

 rounded prominence in the middle, and produced in front to an acute triangu- 

 lar lappet, dactylus strong and curved; those in the not yet sexually deve- 

 loped male having the propodos somewhat larger, and provided in the middle 

 the palm with a short, digitiform projection. Posterior gnathopoda in the 

 adult male very different from those in female, propodos long and narrow, 



