276 REPORT—1868. 
Acidostoma obesum (Bate), =Anonyx obesus, B, & W., Brit. Sessile-eyed Crust. 
vol. i. p. 98, = Acidostoma obesum, Lilljeborg, Crust. Lysianassina, p. 34, 
pl. v. fig. 53-65. St. Magnus Bay, in deep water. 
Callisoma crenata, Bate. Out Skerries, Middle Haaf, 40 fathoms; off Isle 
of Balta, 40-50 fathoms ; St. Magnus Bay. 
Stegocephalus ampulla (Phipps), Cancer ampulla, Phipps, Voyage toward the 
North Pole, 1774, p. 191, pl. xii. fig. 3, =Stegocephalus inflatus, Kroyer, 
Naturhist. Tidsskr. Forste Rekke, Bd.i. p. 150; Bruzelius, Skand. Am- 
phip. Gammarid. p. 38, =Stegocephalus ampulla, Bate, Cat. Amphip. 
Brit. Mus. p. 63, pl. x. fig. 2; Goes, Crust. Amphip. maris Spetsberg. 
alluentis, p. 5. 
A female laden with eggs was dredged in 1867 in St. Magnus Bay, 
in about 50 fathoms. It was not quite a quarter of an inch in length, 
a pigmy compared with its giant brethren from Spitzbergen, with which, 
however, it agrees closely in all particulars. This arctic species is a 
very interesting addition to the British fauna. 
Opis leptochela, Bate & West. MS. “Shetland, received from Mr. Jeffreys,” 
Bate in litt. A species not yet described. 
Pontoporeia affinis, Lindstrom, Ofvers. af K. Vet. Akad. Forh, 1855, p. 63 ; 
Bruzelius, Skand. Amphip. Gammarid. p. 48; Bate, Cat. Amphip. Brit. 
Mus. p. 83, pl. xiv. fig. 2. “Shetland, from Mr. Jeffreys,” Bate in litt. 
Ampelisca equicornis, Bruzelius, Skand. Amphip. Gammarid. p. 82, pl. iv. 
fig. 15. 
Superior antenne much longer than peduncle of inferior; third joint 
half length of first, and scarely more than one-fourth of second. In- 
ferior antennee with last two joints of peduncle subequal, both pairs of 
antenne fringed with long hairs, and speckled with crimson throughout, 
a stain of the same colour at the joints of the peduncle; nail of first 
two pairs of pereiopoda longer than the two preceding joints combined. 
Last pereiopods haying the posterior lobe of the basos produced down- 
wards to the distal extremity of following joint, rounded inferiorly ; 
meros not posteally produced ; propodos and nail broad and flat. Infero- 
posteal angle of third segment of pleon not produced. Last uropods 
much longer than preceding pairs, branches nearly as long again as 
peduncle. Telson cleft almost to the base, reaching one-third the length 
of the branches of last uropods. Generally a conspicuous hump on the 
back of the fourth segment of pleon, and a hollow in the back of the 
sixth. A common species in our seas. Shetland, Skye, Northumber- 
land and Durham coasts, Guernsey. 
— tenuicornis, Lilleborg, Ofvers. af Kong. Vet. Akad. Férhand. 1855, 
p- 123; Bruzelius, Skand. Amphip. Gammarid. p. 84; Bate, Cat. Crust. 
Amphip. Brit. Mus. p. 96. 
Head produced, obliquely truncate in front, the antenne attached to 
the oblique truncation and directed downwards. Superior antenne 
about equal in length to peduncle of inferior; second joint of peduncle 
much more slender than first; third joint scarcely differing in size or 
length from the joints of the filament, rather more than half length of 
second. Inferior antennz with last two joints subequal, very long and 
slender; filament very long and slender; antenne speckled with red. 
Nail of first two pairs of pereiopoda longer than two preceding joints 
combined. Last pereiopods having the posterior lobe of the basos pro- 
duced downwards to the distal extremity of the following joint, 
rounded inferiorly ; meros not posteally produced; propodos and nail 
