on bosminid^, maceotheicid^;, etc. 373 



us to determine what species occurring there is most likely to 

 have been met with by Jurine and described as his L. striatus. 



Leydig describes and figures two species allied to L. harpce — 

 one under the name of leucocephalus, which is unquestionably the 

 same as that here described ; the second as L. striatus, which he 

 considers to be the same as that described under the same name 

 by Lievin. 



Lynceus harpce is common throughout the British Islands, in- 

 habiting clear water. It is also known in Eussia, Prussia, Nor- 

 way, and Sweden. 



2. Lynceus mackoukus, Mutter. PL XX, fig. 6 ; and PL 

 XXI, fig. 2. 



1776. Lynceus macrourus, Muller. Zool. Dan. Prodromus, 

 2397. 



1850. Camptocercus macrourus, Baird. Brit. Entom., p. 128. 



PL XYI, fig 9. 



1851. Lynceus macrourus, Fischer. Mem. des Sav. etrang. St. 



Petersbourg, Yol. VI, p. 160. PL II, figs. 1-9. 



1853. Lynceus macrourus, Lilljeborg. De Crust, ex Ordin. 

 tribus Clad. Ostra. et Copep. in Scania occur., p. 90. 

 PL VII, figs. 2-4. 



Carapace elongated, narrower behind than in front, dorsal 

 margin gently arched, posterior margin arched ; ventral margin 

 waved, concave centrally, ciliated, having the posterior angle 

 furnished with from two to six conspicuous tooth-like processes ; 

 surface sculptured with well-marked longitudinal waved striae. 

 Head erect, rostrum very short, hood-shaped, rounded at the 

 extremity; anterior antenna? very short, shorter than the short 

 rostrum ; posterior antenna? small. Eye small ; eye-spot nearly 

 equal to it in size, situated nearer to the eye than to the extre- 

 mity of the rostrum. Abdomen very long and narrow, gradually 

 tapering from the base to the claws, wholly devoid of any trace 

 of the usual supero-posteal angle ; superior margin fringed with 

 spines, which under a high magnifying power are seen to be ser- 

 rated ; terminal claws extremely long, nearly straight, furnished 



