214 Part III. — Eleventh Annual Report 



also been obtained in Aberdeen Bay. One of its peculiar characteristics 

 is the structure of the eyes, which consist of four pairs of small lenses 

 about equidistant from each other, and arranged round the circumference 

 of a nearly circular patch of pigment. In the male the second segment of 

 the urosome has the dorsal part produced backward in the form of a free 

 tooth-like process, that extends to nearly the end of the next segment. 



Argissa hamatipes has been recorded for Shetland (Norman) and for the 

 Clyde district (Robertson). 



Genus Ampelisca, Kroyer (1842). 



Ampelisca assimilis, Boeck. (PI. V. figs. 32-35.) 



1870. Ampelisca assimilis, Boeck, 'Crust. Amphip. bor. et arct.,' 



p. 142. 

 1891. Ampelisca assimilis, G. 0. Sars, op. cit., p. 168, pi. lviii. 



%. 2. 



Habitat. — Vicinity of May Island. Apparently scarce. 



This, which is one of the smaller species, is distinguished by the 

 anterior antennas reaching very little beyond the end of the basal joints 

 of the posterior antennas ; the two last basal joints of the posterior antennas 

 are of about equal length. The epimeral plates of the last segment of the 

 mesosome have the postero-lateral angles broadly rounded. The telson is 

 rather longer than broad ; sides of the proximal half straight and parallel ; 

 of the distal half slightly rounded, and converging to the blunt-pointed 

 apex, and bearing a few very small marginal setae. 



Mr Robertson records this species from the Clyde. 



Ampelisca Icevigata, Lilljeborg. (PL V. figs. 36, 37.) 



1855. Ampelisca Icevigata, Lilljeborg, ' Of v. af. Kgl. Vet. Akad. 



'Forh.,'p. 123. 

 1862. Ampelisca Belliana, Sp. Bate, 'Cat. Amphip. Crust. Brit. 



' Mus.,' p. 93, pi. xv. fig. 3. 

 1891. Ampelisca Icevic/ata, G. O. Sars, op. cit., p. 169, pi. lii. 



fig. 1. 



Habitat. — Largo Bay and one or two other places in the Firth of Forth, 

 but not common. 



In this species the anterior antennas scarcely reach to the end of the 

 basal joints of the posterior antennas. The penultimate basal joint of the 

 posterior antennas is considerably longer than the next, and the flagellum 

 is comparatively short, being less than twice the length of the peduncle. 

 The posterior pair of pereiopoda are robust ; the meral joint is produced 

 exteriorly, and forms a lobe-like process as long as the next joint, and 

 densely fringed with cilia. The postero-lateral margins of the epimeral 

 plates of the last segment of the mesosome are doubly and strongly 

 sinuate, the postero-lateral angles being produced into acutely slender 

 teeth. Telson moderately broad, with a pointed apex. 



According to Professor G. 0. Sars, this species is the Ampelisca 

 belliana of Sp. Bate, and Ampelisca Icevigata, Sp. Bate, is the same 

 as Ampelisca tenuicornis, Lilljeborg, which was described by Lilljeborg in 

 1855. 



Ampelisca spinipes, Boeck. (PI. V. figs. 38-40.) 



1870. Ampelisca spinipes, Boeck, 'Crust. Amphip. bor. et arct.,' 



p. 143. 

 1891. Ampelisca spinipes, G. 0. Sars, op. cit., p. 173, pl. 60, 



fig. 2. 



Habitat. — Vicinity of May Island, Firth of Forth. Not common. 



