FEOM THE GULF OF GUIXEA, 133 



represented, however, two widely prevailing groups — the Calt/ptomera and Ghjnomera ; 

 the fii'st is confined almost exclusively to fresh and brackish water, while species belonging 

 to the other are to be found in fresh water and also in the open sea. 

 The following are the two species referred to : — 



CALYPTOMEBA. 



Family PENILID^, Dana. 



Genus Penilia, Dana (1853). 



Penilia orientalis, Dana. 



1853. PenUia orientalis, Dana, Crust. U.S. Expl. Exped. p. 1270, pi. Ixxxix. fig. 3 a-e. 

 SaUtat. Loanda Harbour, in three surface tow-net gatherings, collected February 15th. 

 A number of specimens were observed. 



GYMNOMEBA. 

 Family POLYPHEMIDiE, Baird. 



Genus Evadne, Loven. 



EvADNE NoEDMANNi, Loven. 



This species was obtained in a number of the tow-net gatherings. 



OSTPvACODA. 



Comparatively few Ostracoda were obtained in the ' Buccaneer ' collections. The 

 Ostracoda, with the exception of Halocypris and a few others, live among the weed, or 

 on the sand and mud at the bottom of the water, and can be captured only by the dredge 

 or other implement suited for collecting bottom material ; dead shells of Ostracods, 

 however, may be frequently obtained by carefully examining the sand or other debris on 

 the shore. As, therefore, the ' Buccaneer ' collections consisted chiefly of tow-net 

 gatherings, pelagic species, as Halocypris, were the only forms observed in. all but a very 

 few of the gatherings. 



Several species of Cythere, as well as one or two of other genera belonging both to the 

 Cypridse and Cytheridse, were obtained in a surface gathering from a lagoon at Sao 

 Thome Island, in another from Loanda Harbour, and in a third collected off the mouth 

 of the River Congo. 



