418 Rev. A. M. Norman on new Crustacea Amphipoda. 
the two sexes have frequently been described as different spe- 
cies. ‘The number of British forms must be considerably re- 
duced. Megamera Othonis is the female of MZ. longimana; and 
Megamera Alderi is the female of Melita obtusata, 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 antenne slender, much shorter 
than inferior, with secondary appendage. Both gnathopods 
subchelate. Last peredopods rather short, furnished with long 
plumose sete. Fifth and sixth segments of pleon coalesced 
into one. Last wropods two-branched. Telson squamitorm, 
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 Hurope. 
Helleria coalita, n. sp. 
Pl. XXII. fig. 8, and Pl, XXIUL. figs. 1-6: 
Eye round, situated between the origins of the upper and 
lower antenne. Superior antenne 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. Jnfervor 
antenne 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 sete, 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 coxee of first 
