4 Mr. C. Chilton on a neio Species of 



of the peieion ; on each side it is deeply notched for the 

 insertion of the antennse ; it is produced in front between the 

 antenna? and has the front margin, to which the upper lip is 

 attached, straight, with the lateral angles well rounded. The 

 lateral portion behind the bases of the antennse has the ante- 

 rior angle somewhat acute and the posterior angle produced 

 and rounded and bearing the large eyes, which are thus some- 

 what pedunculated, though apparently not so much so as in 

 some other species of the genus. 



The pertion (Plate I. tig. Ij has the first segment a little 

 broader than the head, rather shorter than the second, the 

 second, third, and fourth subequal in length, widening slightly 

 up to the fourth segment, which is the widest ; the fifth, 

 sixth, and seventh segments are progressively shorter and 

 curve backwards at the sides into rounded lobes, which are 

 somewhat gaping laterally. 



The j)hon (Plate I. fig. 1) is much narrower than the 

 pereion, somewhat conical or pear-shaped, rapidly narrowing 

 posteriorly, with the extremity rounded. It usually projects 

 slightly upwards, and the uropoda are barely visible in a 

 dorsal view. 



The untennuhs (inner antenna?) (Plate I. figs. 2 and 3) reach 

 somewhat beyond the end of the third joint of the peduncle 

 of the outer antenna?. The first or basal joint is the broadest, 

 being about two thirds as broad as long ; the second joint is 

 about as long as the first, but only half as broad at the base ; 

 it expands considerably towards the distal end and bears a 

 few fine setae scattered over the surface ; the next two joints 

 are subequal, small, the two together being less than half the 

 length ot the second joint ; each is nearly as broad as long, 

 they are followed by a long slender joint as long as the 

 second and third together ; at the extremity of this are two 

 very small joints provided with long " olfactory filaments." 



In the possession of the long slender joint at the end of the 

 antennules this species resembles Munna Whiteana, Spence 

 Bate and Westwood *. It is evidently, however, subject to 

 some variation, for I have one specimen in which the right 

 antennule is of the normal shape, as already described, but 

 the leit one has the long fiftii joint only about two thirds as 

 long as that on the right, while the following joint is much 

 larger than usual, being about one half the length of the fifth 

 joint ; both of these bear " olfactory filaments," so that 

 dtiubtless the long fifth joint should be looked upon as a 

 modified portion ot the tlagellum. 



* ' British So-^silo-evod C'niPtnroft.' ii. p. 829. 



