MUSEUM OF COMPARxVTIVE ZOOLOGY. 93 



The first maxillipeds (PI. XV. fig. 7) resemble those of the typical species of 

 Penaus. The distal lobe of the protopod is large, rounded in outline distally 

 and about two and a half times as long as broad. The endopod is composed 

 of three segments : the proximal segment is a little more than half the whole 

 length, broad at base but narrow distally and with the inner margin abruptly 

 contracted near the middle, leaving an angular projection which is armed with 

 long setae, while beyond this projection it is narrowed to near the extremity 

 and is regularly curved inward round, and extends considerably beyond, the 

 end of the protopod ; the two distal segments are nearly straight, approxiinately 

 equal in length, very narrow, and with a regular series of slender plumose 

 setae along either edge, those on the outer edge being much the larger. The 

 exopod reaches to about the base of the distal segment of the endopod, is nar- 

 row, twelve to fifteen times as long as broad, but lamellar, and edged with a 

 regular series of long plumose setae. The epipod is small, but with a distinct 

 anterior lobe, has a few hairs or setae along the edges, and is apparently not 

 branchial. 



The endopod in the second maxilliped (PI. XV. fig. 8) is large and stout : 

 the ischium as usual is shorter than broad ; the merus is as long as the entire 

 protognath of the first maxilliped, and about a fourth as broad as long ; the three 

 distal segments are subequal in length and together about as long as the merus, 

 the propodus about as wide as the merus, but the carpus and dactylus a little 

 narrower ; the dactylus is obtusely rounded and armed with a few strong 

 spines distally, and both margins of the three distal segments and the inner 

 margins of the proximal are clothed as usual with stout setse and hairs. The 

 exopod is very small, slender, nearly cylindrical, about as long as the merus, 

 and the distal half multiarticulate, flagelliform, and furnished with small 

 plumose setae. The lamellar epipod is narrow-ovate, not bilobed distally, and 

 bears a rather small dendrobranchia. 



The external maxillipeds (PL XV. fig. 9) are very long and slender, though 

 as thick as any of the legs, longer than the carapax and rostrum, and reach 

 beyond the tips of the antennal scales fully the length of their dactyli: the 

 ischium, merus, and carpus are approximately equal in length and subequal in 

 diameter ; the propodus and dactylus taper slightly and regularly ; the pro- 

 podus is fully two thirds and the dactylus half as long as the carpus ; all the 

 segments are thickly armed along the inner side with fascicles of exceedingly 

 long and slender spines or stout setae, and the three distal are similarly armed, 

 but with shorter spines and setae, on the other sides. The exopod is rudi- 

 mentary and exceedingly minute, being very slender and much shorter than 

 the diameter of the merus. The epipod is well developed, lanceolate, and 

 undivided at the tip. 



All the thoracic legs have very minute exopods, and all except the fifth pair 

 have narrow and undivided epipods like the external maxillipeds. The first 

 legs (PI. XV. fig. 10) are about as long as the carapax excluding the rostrum, 

 reach to the middle of the antennal scales, are slightly compressed, and stouter 

 than the succeeding pairs : the merus is about twice as long as the ischium and 



