94 



Bulletin VanderbUt Marine Miiseum, Vol. VI 



The antennulae have the plate arising from the proximal inner 

 angle of the first peduncular article very narrow for two-thirds 

 of its length, widening distally into an oval process. The second 

 and third articles are successively shorter, the third article ex- 

 tending as far as the subdistal tooth of the outer margin of the 

 scaphocerite ; the flagellum has the thick, longer whip about as 

 long as the scaphocerite ; the lower branch is two-thirds as long 

 as the upper one and much finer. 



The antennae are typically Peneus, the scaphocerite with a 

 subdistal, lateral tooth and the distal margin with a weakly 

 rounded, subtriangulate contour. 



All five pairs of legs possess epipodites. The first pair of legs 

 has an acute, antrorse spine developed at the inner ventral angle 

 of each the basis and ischium. The second pair of legs has such 

 a spine on the basis only. 



Text figure 6 — Peneus indicus (H. M. Edwards), petasma of adult male, 

 slightly opened, shown from posterior side, X 6. 



The male petasma is simple (fig. 6) , composed of equal halves, 

 with the inner ventral margins thickened, side by side, termi- 

 nating in a small, rounded tip, bent over ; a distinct groove runs 

 along the inner face of this margin ; beyond this margin the mem- 

 brane is bent into a lamina, widely rounded distally, narrowed 

 ventrally and bent over, forming a tubular cavity within each 

 half, the inner face of this tube is marked by a longitudinal ridge 

 which divides it into two grooves besides the above described ven- 

 tral groove. In larger males, the petasma may be more developed 

 than the one above described. 



