286 REPORT— 1868. 
the following joints; nails strong, scimitar-shaped, the entire limbs 
almost naked (having only a very few short scte upon them). Length 
one-fifth of an inch. A single female dredged in 100-110 fathoms, 
twenty-five miles N. by W. from Burrafirth Lighthouse, in 1867. ‘The 
specimen is imperfect, having lost antenne, &e. Thesixth and seventh 
segments of the pereion appear to be coalesced. It approaches Latma- 
tophilus tuberculatus of Bruzelius, but is much more strongly tubercu- 
lated, and the gnathopods of different structure, the first smaller, the 
second larger, the hand broader, and the basos spined, 
Unciola planipes, Norman, Nat. Hist. Trans. of Northumberland and Durham, 
vol, i. (1865) p. 14, pl. vii. figs. 9-18. Balta Sound, 5-7 fathoms. Many 
specimens. 
Corophium longicorne (Fabricius). ‘Some specimens, which we take to be 
the young of this species, we find in the collection sent to us by the 
Rev. A. M. Norman, taken in from two to five fathoms, in Outer Sker- 
ries Harbour, Shetlands” (B. and W.). 
—— crassicorne, Bruzelius, the male,=Corophium Bonelli, Bate & Westw. 
Brit. Sessile-eyed Crust. vol. i. p. 497 (? Corophiwm Bonellii, M.-Kd- 
wards), the female. Very abundant, in 2-5 fathoms, Out Skerries Har- 
bour. The OC. Bonellii of Bate and Westwood is unquestionably the 
female of C. crassicorne; the female of C. longicorne (which B, and W. 
thought C. Bonelliit might be) is quite different. 
—— tenuicorne, n. sp. Two females, dredged in St. Magnus Bay, resem- 
bling in general characters the same sex of longicorne and crassi- 
corne, but distinguished as follows. Superior antenne slender, longer 
than the inferior; first joint cylindrical (not expanded), peduncle with 
two or three spines on inner edge ; second joint longer than first, slender, 
third not half as long as second; filament composed of six long joints, 
the terminal one bearing a number of long tentaculiform sete. Inferior 
antenne with penultimate joint of peduncle cylindrical (not expanded), 
inner edge with two or three articulated spines about the centre, and a 
single long, slender, articulated spine at the distal termination; last 
joint about two-thirds as long as the penultimate, bearing two spines on 
the middle of the inner side; filament unusually pediform, consisting of 
a long, stout articulation (more than half as long as the last joint of the 
peduncle) and a strong terminal nail. Finger of gnathopods bidentate 
at the apex. Nail of pereiopods longer than carpus and propodos com- 
bined. First and second uropods terminating in long slender spines, 
which are more than half as long as their rami; last uropods having the 
branch longer than its peduncle, not wide, three times as long as broad, 
tipped with long sete, but having no sete on the inner and outer mar- 
gins. Length about one-fifth of an inch. The specimens procured are 
females laden with eges; the male is unknown to me. 
Hyperia galba (Montagu), Bate & West. Brit. Sessile-eyed Crust. vol. ii. 
p. 12, the female, = Lestrigonus Kinahani, Bate & Westw. l.c¢. p. 8, 
the male,=? Lestrigonus exulans, l.c. p. 5, the young male,=? Hyperia 
medusarum, Bate, Cat. Amphip. Crust. Brit. Mus. p. 295, pl. xlix. fig. 1, 
the young female (but not Metoécus medusarum, Kroyer). In Aurelia, 
open sea, twenty-five miles N. by W. of Unst. 
I believe that the above four so-called species are the different sexes 
and periods of growth of one. The specific points will be found in the 
structure of the gnathopods (as accurately deseribed by B. and W. under 
Lestrigonus exulans) and of the uropods, which have the rami of all three 
