ON BOSMINIDiE, MACKOTHETCID^, ETC. 359 



gradually tapers to the claws instead of having its termination 

 widely truncate. 



Tarns on the Humbles, Northumberland ; Mickle Fell, York- 

 shire ; Loch Skene, Dumfriesshire ; Windermere ; and Lough Bol- 

 lard, Connemara (Gr. S. B.); Stornoway, in Lewis (A. M. N.) 



3. Bosmina Cokegom, Baird. PI. XXII, fig. 3. 



1834. "Food of the Vendace." Knox Trans. Roy. Soc, Edinb., 



Vol. XII. Part II. PL II, figs. 3-5. 

 1857. Bosmina Coregoni, Baird. Edinburgh XewPhilos. Journ., 



• Vol. VI, p. 24. 

 1857. Bosmina Coregoni, A. White. Pop. Hist. Brit. Crust., 



p. 273. 

 1861. Bosmina Lilljeborgii, Gr. 0. Sars. Om de i Omegnen af 



Christ, forekom. Clad. (Andet. Bidrag.), p. 30. 



Head flat, the dorsal line scarcely at all declining until the 

 greatest breadth of the carapace is reached. Carapace exces- 

 sively wide, in the adult female the width anteriorly exceeds the 

 total length of the animal ; narrow and truncate at the posterior 

 extremity ; ventral margin nearly straight, dorsal excessively tu- 

 mid; infero-posteal angle well marked, but without any trace 

 of spine formed projections ; surface of valves reticulated, reticu- 

 lations mostly sexangular, the sculpturing more evident on the 

 infero-anteal portion of shell. Bostrum of moderate length ; an- 

 terior antennae of very remarkable length, as long as the entire 

 carapace, composed of about twenty articulations, nearly straight, 

 and projected at a very considerable angle from the ventral mar- 

 gin. Posterior antennae short. Length, -sVth of an inch. 



The only known British locality for this curious little species 

 is Lochmaben Castle Loch, Dumfriesshire, where, together with 

 Macrothrix rosea, &c, it forms an important item in the food of 

 the Vendace (Coregonus alhula, Lin.). It has also been described 

 by Sars, from Sweden ; at least, we can scarcely doubt that his 

 C. Lilljeborgii is the same species ; his description exactly agree- 

 ing with C. Coregoni, except that the surface of the shell is said 

 to be striated. 



