418 Rev. A. M. Norman on new Crustacea AmpMjooda. 



the two sexes have frequently been described as different spe- 

 cies. The number of British forms must be considerably re- 

 duced. Megamcera Othonis is the female of M, longimana ; and 

 MegamcBra Alderi is the female of Melita ohtusata^ with which 

 species Melita proxima must also be united as another and the 

 more usual form of the male. 



I have named this species after my friend Mr. Spence Bate 

 — a slight tribute to one who deserves much honour for his 

 valuable labours in the investigation of the Sessile-eyed Crus- 

 tacea. 



Helleria, nov. gen. 



Eyes compound. Superior antennce slender, much shorter 

 than inferior, with secondary appendage. Both gnathopods 

 subchelate. Last pereiopods rather short, furnished with long 

 plumose setae. Fifth and sixth segments of pleon coalesced 

 into one. Last uropods two-branched. Telson squamiform, 

 cleft almost to the base. 



This genus is easily distinguished by the peculiar structure 

 of the hinder portion of the pleon, with its coalesced fifth and 

 sixth segments. I have dedicated it to Prof. Heller, who has 

 done so much to elucidate the Crustacea of the south of Europe. 



Helleria coalita^ n. sp. 

 PI. XXII. fig. 8, and PL XXIII. figs. 1-6. 

 Eye round, situated between the origins of the upper and 

 lower antennge. Superior antennce having first joint of pe- 

 duncle of moderate dimensions, somewhat shorter than the 

 second ; third joint not longer than, and scarcely differing in 

 appearance from, the first joint of the flagellum ; the peduncle 

 not furnished with any spines, having only a few very small 

 cilia; flagellum consisting of about nine elongated articula- 

 tions, and slightly exceeding the peduncle in length. Inferior 

 anterince very long, last and penultimate joints of peduncle 

 subequal in length, the latter with the lower margin convex, 

 the upper clothed with short down ; flagellum slender, the 

 joints remarkably long. First gnathopods with wrist and hand 

 of about equal length, the latter subquadrate ; palm scarcely 

 oblique, well defined, a little convex; finger gently curved, 

 shutting closely with the palm. Second gnathopods almost 

 identical with the first in size and structure. Last pereiopods 

 short ; thigh expanded behind into a semielliptic lobe, which 

 is widest above, and has a simple (^. e. not serrate) margin ; 

 metacarpus and wrist wide, and fringed on both margins with 

 long plumose setse, which project at right angles from the limb; 

 hand narrow, styliform, equal to wrist in length ; nail strong, 

 bent at right angles to the hand. Pleon with coxae of first 



