ON THE SHETLAND CRUSTACEA, TUNICATA, ETC, 287 
pairs wide in the middle but narrowed at the base, and mucronate at 
the terminations; the inner margins of the rami of the first pair, and 
the inner margin of the outer ramus, and both margins of the inner 
ramus of the last two pairs, are elegantly serrated. 
Hyperia oblivia, Kréyer, Gronlands Amphipoder, p. 298, pl. iv. fig. 19 (but not 
H. oblivia, Bate & Westw. vol. ii. p. 16). Filaments of both antenne 
consisting of only a single joint. First gnathopods with wrist and hand 
subequal, the former spined posteriorly, not at all produced distally ; 
hand slightly tapering, palm serrate distally, finger two-thirds as long 
as hand. Second gnathopods with meros sheath-formed, tipped with 
* spine-like sete and overlapping carpus; carpus greatly produced dis- 
tally into a lobe which reaches nearly to the extremity of the hand ; 
finger straight, two-thirds as long as hand. Pereiopoda, last three pair 
much longer and more slender than in H. galba; carpus and propodos 
both very long, the latter the longer, both with small distant spines on 
the hinder margin, and the whole hinder edge of the propodos micro- 
scopically pectinate. Rami of all the uropods lanceolate (not widening 
in the middle), gradually tapering to the end (not mucronate as in 
H. galba) ; the general serrated character of the margins of the rami 
agrees with H. galba, except that the external margin of the inner 
ramus of the second pair is not serrated. The male differs from the 
female, as in the last two species, in having the antenne very long and 
slender. ; 
A female from an Aurelia, and males taken living free in the towing- 
net. It has also been sent to me by Mr. Edward from Banff; and 
Mr. G. 8. Brady has procured both sexes in some numbers off the mouth 
of the Tees in the towing-net. 
Bate and Westwood’s “ H. oblivia,” which has not the propodos of the 
gnathopods at all produced, cannot be Kriyer’s species nor that here 
deseribed*. Gées takes Kroyer’s Lestrigonus exulans to be the male of 
H. oblivia ; and as far as the description and figures go, it may be the 
male either of that or of H. galba; but the short pereiopoda of ZL. exulans 
and L. Kinahani of Bate will not agree with the male of H. olivia. 
Metoécus medusarum, Kroyer, Gronlands Amphip. p. 288, pl. iii. fig. 15 (not 
Hyperia medusarum, Bate, Cat. Amphip. Crust. Brit. Mus. p. 295). 
Female antennz very short; filaments of both pair one-jointed. Both gna- 
thopods nearly alike, short, distinctly chelate, and of peculiar structure ; 
meros produced into a large sleeve-shaped process, postero-distally tipped 
with sete, which fits round the basal portion of the carpus; carpus 
postero-distally produced into a large lobe, which extends as far as the 
extremity of the propodos, with which and with the finger it forms a 
regular chelate organ; propodos slightly tapering from the base to the 
extremity; its inner margin, the inner margin of the small finger, and 
the inner margin of the thumb-used lobe of the carpus all denticulately 
serrated ; hand and wrist wholly free from hairs or spines. Pereiopods of 
moderate length; earpus and propodos subequal, their inner margins 
microscopically pectinate. All the uropods having the inner margin of 
outer ramus, and both margins of inner ramus serrated. The male 
differs from the female in having very long antenne. 
A female found in a Medusa in Shetland in 1867; and a male has 
been sent to me by Mr. T. Edward from Banff. 
The Hyperia medusarum of Bate bears no resemblance to Kriyer’s 
* T would propose for it the name of H. gracilipes. 
