124 Rev. A. M. Norman’s Notes on British Amphipoda. 
Elasmopus rapax, Costa. (Pl. XI. figs. 1-8.) 
1853. Elasmopus rapax, Costa, Crost. Amfip, del Regno di Napoli, 
p. 212, pl. iv. fig. 5, db. 
1855. Gammarus brevicaudatus, Bate, Rep. Brit. Assoc. p. 58, ©. 
1862. Megamera brevicaudata, Bate, Cat. Amphip. Crust. Brit. Mus. 
. 228, pl. xl. fig. 2. 
1862, Megamera brevicaudata, Bate & Westw. Brit. Sessile-eyed 
Crust. vol. i. p. 409, 9. 
1866. Mera brevcaudata, Heller, Amphip. des Adriat. Meeres, p. 42, 
pl. iit. figs. 27, 28, g 2. 
1870. Elasmopus latipes, Boeck, Crust. Amphip. bor. et arct. p. 132. 
1876. Elasmopus latipes, Boeck, De Skand. og Arkt. Amphip. p. 393, 
lL. xxiv. fig. 1, ¢: 1887. Chevreaux, Crust. Amphip. du Sud-ouest 
de la Bretagne, p. 20, and woodcut 3, ¢. 
1888. Mera rapax, Th. Barrois, Cat. des Crustacés marins recuellis 
aux Acores, p. 39, pl. iv. figs. 1-4, and woodcuts, ¢ 9. 
Hab. In my ‘Shetland Dredging Report’ this species is 
recorded thus:—‘‘ A specimen, determined by Mr. Bate, 
dredged in 4 fathoms, Brassay Sound, 1861.” That speci- 
men I do not remember to have ever seen ; it certainly is not 
in my collection now, nor have I seen any British specimen. 
On Bate and Westwood’s authority we have the following :— 
Plymouth (Bate) ; Moray Firth (Rev. G. Gordon). 
Distribution, Adriatic (feller): Mus. Norm. Naples 
(Costa); Azores (Barrois); South-west of France (Chev- 
reaux) ; Norway ? (Boeck). 
Chevreaux tells us that Hlasmopus rapax is a commensal 
of Mata squinado, and states that in some places it is more 
abundant on that crab than its well-known companion Jsea 
Montagu. As, however, Maia squinado is not known in 
either the Moray Firth, Shetland, or Norway, Elasmopus, if 
found in these localities, must there forego the friendship. 
I give figures taken from Adriatic specimens which will 
for the most part speak for themselves. But it is desirable 
to call attention to the variation in form of the hand in the 
second gnathopod of the male. I give figures (PI. XI. 
figs. 3-5), all to the same scale, of this organ in three speci- 
mens of different size. The finger closes, as has been 
described by Barrois, into a hollow on tbe inner face of the 
hand, at the proximal end of which is a tooth-process (a). 
This hollow, it will be seen in the youngest specimen, is 
ovoid, and the hand itself is nearly oblong ; with increasing 
age the hand becomes more pyriform, narrowing distally, 
the hollowed space longer and narrower, and the portion of 
the hand anterior to the commencement of the hollow shorter 
in proportion to that beyond it. As regards the spines and 
tubercles, in none of my specimens is the tooth-process (a) in 
