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, 

 pi. 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. 



StegocepTialus ampulla (Phipps), Cancer ampulla, Phipps, Voyage toward the 

 North Pole, 1774, p. 191, pi. xii. fig. 3, Stegocephalus inflatus, Kroyer, 

 Naturhist. Tidsskr. Forste Kaekke, Bd. i. p. 150 ; Bruzelius, Skand. Am- 

 phip. Gammarid. p. 38, = Stegocephalus ampulla, Bate, Cat. Amphip. 

 Brit. Mus. p. 63, pi. x. fig. 2 ; Goes, Crust. Amphip. niaris 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. Yet. Akad. Forh. 1855, p. 63 ; 

 Bruzelius, Skand. Amphip. Gammarid. p. 48 ; Bate, Cat. Amjftiip. Brit. 

 Mus. p. 83, pi. xiv. fig. 2. " Shetland, from Mr. Jeffreys," Bate in litt. 



Ampelisca cequicornis, Bruzelius, Skand. Amphip. Gammarid. p. 82, pi. iv. 

 fig. 15. 



Superior antennae much longer than peduncle of inferior; third joint 

 half length of first, and scarely more than one-fourth of second. In- 

 ferior antennae with last two joints of peduncle subequal, both pairs of 

 antenna 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 having 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. 



tenuicomis, Lilljeborg, Ofvers. af Kong. Vet. Akad. Forhand. 1855, 



p. 123 ; Bruzelius, Skand. Amphip. Gammarid. p. 84 ; Bate, Cat. Crust. 

 Amphip. Brit. Mus. p. 96. 



Head produced, obliquely truncate in front, the antennae attached to 

 the oblique truncation and directed downwards. Superior antennae 

 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 antennae with last two joints subequal, very long and 

 slender; filament very long and slender; antennae 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 



