1889.] ON SOME FRESHWATER OSTRACODA AND COPEPODA. 5 



Descriptions of the Species, with Biological 

 Observations. 



Order Ostracocla. 

 Tribe JPodocopa, 

 Family Cyprididae. 

 Gen 1. Cyprinotus, Brady, 1885. 

 Generic Characters. — Shell rather thin, compressed, oval 

 or subtriangular, height considerably exceeding the half length, 

 dorsal margin greatly vaulted, ventral almost straight. Valves 

 rather unequal, the right being overlapped by the left both an- 

 teriorly and posteriorly, but sometimes dorsally produced far 

 beyond the level of the latter. Free edges of the left valve smooth, 

 and having at either extremity a rather broad hyaline border, those 

 of the right armed with a regular series of small tuberculiform 

 teeth. Inner duplicatures of both valves rather narrow. Natatory 

 setae of lower antennas very elongate, reaching far beyond the 

 terminal claws. Palpus of 1st pair of maxillae rather narrow, 

 last joint linear; masticatory lobes of middle length. Caudal 

 rami narrow, claws smooth, seta of dorsal edge close to the claws. 

 Propagation sexual. Prehensile palps of 2nd pair of maxillae in 

 male rather powerful, unequal. Copulative organs comparatively 

 small, with outer plate obtuse, linguiform. Ejaculatory tubes 

 narrow, with numerous wreaths of spines, crown simple, not 

 produced. 



Remarks. — This genus has been established by Mr. Brady 

 upon a Ceylon species, having the dorsal part of the right 

 valve produced in an unusual manner to a strongly projecting 



