372 REV. A. H. NORMAN AND ME. G. S. BRADY 



1850. Acroperus harpce, Baird. Brit. Enteral., p. 129. PI. 

 XYI, fig. 5. 



1850. Lynceus leucocephalus, Fischer. Mem. des Sav. etrangers, 

 St. Petersbourg, Vol. VII, p. 11. PI. Ill, figs. 6-9. 



1853. Lynceus striatus, Lilljeborg. De Crust, ex Ord, tribus 

 Clad. Ostrac. et Copep., p. 88. PI. VII, fig. 5. 



1860. Lynceus leucocephalus, Leydig. J^aturges. der Daphni- 

 den, p. 218. PI. IX, figs. 64, 65. 



1863. Lynceus leucocephalus and harpce, Schoedler. JSeue Beit- 

 rage zur ISaturges. der Daphniden, p. 30. PI. I, figs. 

 11-16; p. 82. 



Carapace somewhat semicircular, wide in proportion to its 

 length, dorsal margin well arched ; posterior extremity very ob- 

 liquely truncate and forming a continuous arch with the dorsal 

 margin ; ventral margin slightly concave beyond the middle, 

 ciliated ; infero-posteal angle with two or three very minute 

 teeth ; surface obliquely striated. Head scarcely depressed, 

 hooded, rostrum short, wide, rounded at the extremity ; anterior 

 antennae shorter than the rostrum ; posterior antennae long and 

 slender. Eye small, eye-spot triangular, nearly as large as the 

 eye, situated midway between it and the end of the rostrum. 

 Abdomen of moderate length, parallel sided, distally truncate, 

 with a decided supero-posteal angle, no spines on the margin, 

 but a row of very delicate spines or setae on the side of the abdo- 

 men ; a little bunch of hair on the extremity of the abdomen near 

 the origin of the claws- claws very long, slender, and nearly 

 straight, furnished with one delicate spine near the base, and a 

 second, very delicate and slender, springing from a little beyond 

 the middle. Length, -§Vth of an inch. 



"We have rejected the name of striatus for this species, inas- 

 much as Jurine's figure and description seem to accord better 

 with the L. elongatus of G. 0. Sars than the L. harpes of Baird. 

 In the present state of uncertainty it is advisable to drop Ju- 

 rine's name altogether ; hereafter, perhaps, the investigations of 

 some carcinologist, in the neighbourhood of Geneva, may enable 



