394 REV. A. II. NORMAN AND ME. CJ. S. BEADY 



if that figure be correct, we hold that his species must be different 

 from that which has been met with by ourselves, which would 

 then have to bear Leydig's name, personatus. We have never 

 seen any of the Cladocera to be at one time reticulated and at 

 another striated ; though certain species sometimes have the 

 usually characteristic sculpturing, whether striation or reticu- 

 lation, of the valves obsolete ; and some, as L. quadrangular is, 

 have on some parts of the carapace a combination of reticulated 

 and striated markings. 



17. Lynceus EOSTEATtrs, Koch. PI. XIX, fig. 1 ; and PI. 

 XXI, fig. 6. 



1841. Lynceus rostratus, Koch. Deutschlands Crustaceen, My- 

 riapoden und Arachniden, p. 36. PI. 12. 



1850. (?) Alona ovata, Baird. British Entomostraca, p. 133. 

 PI. XVI, fig. 2. 



1853. Lynceus rostratus, Lilljeborg. De Crust, ex Ordin. tribus 



Clad. Ostrac. et Copep. in Scania occurrentibus, p. 78. 

 PL YI, fig. 9. 



1854. Lynceus griseus, Fischer. Bui. de Soc. Imp. des INatur. 



de Moscou, p. 430. PI. Ill, figs. 17-20. 



1860. Lynceus rostratus and griseus, Leydig. Naturges. der 

 Daphniden, p. 227 and 231. 



1862. Alonella rostrata, Gr. 0. Sars. Om de i Omeg. af Christ. 



forkom. Cladocerer. Andet Bidrag., p. 



1863. Lynceus rostratus and griseus, Schoedler. Xeue Beitrage 



zur Naturgeschichte der Cladoceren, p. 48 and 49. 



Carapace ovate, rather elongated, dorsal margin gently and 

 equally arcuate ; ventral convex, fringed with long cilia, the in- 

 fero-posteal angle completely rounded off, and not furnished with 

 any teeth ; posterior margin rounded with the ventral, but some- 

 what angulated at its junction with the dorsal margin ; surface 

 arcuately striate, the infero-anteal portion of the carapace (i.e., 



