724 Brady and Norman — Monograph of the Marine and Freshwater Ostracoda 



1. Ilyodromus olivaceus, Brady & Norman. 



1889. Herpetocypris olivacea, . . Brady & Norman, "Mon. Ostracoda-Podocopa," 



Pt. I., p. 89, pi. i., figs. 3, 4. 

 1891. Cypris „ . . Vavra, " Men. der Ostracoden Bbhmens.," 



p. 88, fig. 29. 



1894. Herpetocypris ,, . . Cronebekg, " Beitrag sur Ostracoden Fauna 



der Umgegend von Moskau" (Bull de 

 Moscou), p. 14, pi. vii., fig. 13 a—d. 

 Separate copy. 



1895. Ilyodromus olivaceus, . . Sars, G. O., " Contrib. Freshwater Entom. of 



New Zealand " (Vidensk-Selks. Skrifter, 

 1894), p. 39. Separate copy. 



Distribution. — Bohemia (V^vra) ; near Moscow (Croneberg). 



2. Ilyodromus Robertsoni, Brady & Norman. 



1889. Herpetocypris Rohertsoni, . . Brady & Norman, " Mon. Marine and Fresh- 

 water Ostracoda-Podocopa," pt. i., p. 88, 

 and woodcut. 



Distribution. — Norway (G. 0. Sars). 



Genus Prionocypeis,* n. g. 



Shell subtriangularly oblong, higher in front than behind, compressed; surface 

 punctate and hirsute ; the extremities more or less denticulately serrated. Antennae 

 with short setse ; animal incapable of swimming freely. Maxillae having the claws 

 of the outer member quite simple; palp with last joint slightly widening at the 

 extremit}^, its length slightly exceeding the breadth. Caudal rami slender, the 

 dorsal margin quite smooth ; dorsal seta very near the terminal claws. 



The shell in this genus is markedly distinct from that of Herpetocypris reptans 

 and its allies. The caudal rami are smooth-edged, and not denticulated ; but a 

 very marked character consists in the simple claws of tlie outer member of tlie 

 first maxillae. These in Cypris and in H. rejitans have their edges denticulated (see 

 figures of these claws represented in many species figured by Vavra). 



* wpLuiv, a saw. Named from the serrated extremities of the valves. 



