REPORT ON THE AMPHIPODA. 1019 



plate of the First Maxillw may not be constant either in the genus Mxra or in the 

 genus Elasmopus, but, so far as I have been able to examine, in species of Msera there 

 are not fewer than nine of these spines, while in species of Elasmopus there are not 

 more than seven. It is possible that Moera incerta, Chilton, 1882-3, may belong to 

 the latter rather than to the former genus. Moera crassipes, Haswell, 1880, also in all 

 probability belongs to this genus. 



Elasmopus subcarinata (Haswell) (Elasmopus per setosus, PI. XCVIII.). 



1880. Megamaira sub-carinata, Haswell, Proc. Linn. Soc. N.S.W., vol. iv. p. 335, pi. xxi. 



fig. 4. 

 1882. Moera petriei, G. M. Thomson, Trans. New Zealand Inst., vol. xiv. p. 236, pi. xviii. fig. 3. 



1882. Megamaira sub-carinata, Haswell, Catal. Australian Crust., p. 260. 



1883. Moera petriei, Chilton, Trans. Now Zealand Inst., vol. xv. p. 82, pi. ii. fig. 4a. 



1884. Mwra sub-carinata, Chilton, Proc. Linn. Soc. N.S.W., vol. ix. pt. iv. (extract) p. 5. 



1884. „ „ Chilton, New Zealand Journal of Science, vol. ii. p. 230. 



1885. „ „ Chilton, Ann. and Mag. Nat. Hist., ser. 5, vol. xvi. p. 368. 



Rostrum rudimentary, lateral lobes of the head rounded, with a very small lobe 

 immediately below the large one, from which the margin slopes backwards, gently concave, 

 to the rounded lower corner ; first three segments of the pleon with the posterolateral 

 angles acute ; submarginal spines at six points along the lower border of the third 

 segment ; the fourth segment behind the dorsal depression becoming dorsally bicarinate, 

 the carinae produced a little apically in sharp teeth, bending slightly towards one 

 another. 



Eyes large, reniform, situated near or on the lateral lobes of the head, dark coloured 

 in spirits ; ocelli small, numerous. 



Upper Antennae longer than the lower ; first joint long, equal in length to the 

 second but twice as broad, with three spines along the lower margin ; second joint with 

 many groups of setae about it ; third joint three times as long as broad, not half the 

 length of the second, similarly furnished ; flagellum broken, fifty-two joints remaining, 

 the first longer than broad, the next thirty or so broader than long, all widening a little 

 distally, and there carrying groups of setae with an occasional cylinder ; secondary 

 flagellum of six joints tipped with setae ; the last joint rudimentary, the six together 

 longer than the first six of the primary flagellum, or than the third joint of the peduncle. 



Lower Antennas. — Peduncles and flagclla respectively shorter and thinner than those 

 of the upper pair ; the first three joints short, the first not expanded, the gland-cone well 

 developed, decurrent, the distal margin of the two coalesced joints bearing three small 

 spines above, below these being produced into a process longer than the gland-cone, and 

 as long as the third joint; the third joint with a subdistal spine and setae; the fourth 

 joint much longer than the first three united, longer than the fifth, carrying numerous 



