Rev. A. M. Norman's N'otes on British Aniphijpoda. 123 



Megaluropus agilis, Norman. 

 (PI. X. figs. 15-17.) 



1889. Mugaluropns ar/ilis, Norman, Ann. & Mag. Nat. Hist. ser. G, 

 vol. iii. p. 44:ij, pi. xviii. figs. 1-10 ; Iloek, Crustacea Neerlandica, 

 Tidsclirift der Nederlandsche Dierkundig-e Vereeniging, 2de Reeks, 

 Dec. ii. p. 28, pi. vii. fig. 7, pi. viii. fig. 3, pi. ix. fig. 3, 



Distrihution. Holland [Hoelc). 



Female. — The second gnatliopod of tlie female is well 

 figured by Hoek. It is not ovate, as in the male, but nar- 

 row and not more tlian half the breadth of the wrist^ widest 

 and slightly angled below at half its length. 



Male. — The figure given by me of the second gnathopod 

 represents that of the male. The eye is considerably larger 

 than in the female and passes upwards behind the base of the 

 antennules. Antennules and antenna longer, the two basal 

 joints of the former and the three distal joints of the peduncle 

 of the latter hirsute, with short stiff seta3. Antennules 

 shorter than peduncle of antenna?, second joint longer than 

 the first, third very short, subequal to first joint of flagellum ; 

 flagellum consisting of eight articulations, without calceola, 

 but each articulation furnislied with one of the long strap- 

 formed membranaceous appendages or " olfactory papillae " 

 often met with in this situation; secondary appendage two- 

 jointed, about as long as the first articulation of the flagellum. 

 Antennas Avith third and fourth joints stout and the latter and 

 the fifth joint very long and subequal ; flagellum of sixteen 

 very long and slender articulations^ without calceola or strap- 

 shaped appendages. 



Genus IV. Elasmopus, Costa, 1853. 



Mandibles with third joint of palpus much larger than the 

 second, curved and very setose. Second maxilhe having the 

 inner lamina ovate, ending in seta?. Antennules longer than 

 antennae, the peduncle elongated. Second gnathopods longer 

 than the first. Peraopods of last three pairs with the joints 

 very broad and outspread. Uropods of last pair with branches 

 of equal length and broad. Telson deeply cleft. 



The cliief points by which this genus is distinguished from 

 Mcera are the very broad joints of the perasopods, and the 

 branches of the last uropods being short, equal, and abruptly 

 truncated apically. 



