1906.] 



TURBELLARIA OF THE CAPE VERDE ISLANDS. 



711 



The uteri are crowded with eggs (PL LII. fig. 1, itt.). 



The ovaries lie dorsally to the gut-branches and to some extent 

 between them, whilst the testes are on the ventral side. 



The affinities o£ the genus are doubtful, but seem to me to be 

 most probably with the Leptoplanidte, though perhaps some 

 affinity with Stylochocestics may be suggested. 



Zygantroplana may be defined as follows : — • 



An Acotylean genus in tohich the hocly is of an elongate-oval 

 shape, loithout tentacles. The terminal genital ducts o^jeii into a 

 small common ant7^um situated at the extreinie hinder end of the 

 body. Penis small, without stylet, no definite prostate gland. 

 Pharynx stihcentral. iVo imarginal eye-groups. 



The species bears some resemblance to Leptoplana angusta 

 VerriU [1888] pp. 485-486, pi. xl. fig. 8, pi. xliv. figs. 2, 2 a, 3, but 

 the latter has, according to Yerx'ill's figure, more distinct traces of a 

 tentacle eye-group. L. angtista may perhaps prove to be congeneric 

 with the present species. 



LATOCESTIDiE. 



Latocestus plehni, sp. n. (Text-fig. 112.) 



Several specimens " found in deep crevices of nullipore, or in 

 shells, never in the open. The worm will crawl out of its hiding- 

 place at night if kept in a basin of sea-water, and will even leave 

 the water and reach out over the edge of the basin, holding the 

 anterior half of its body horizontally in the air. 



Text-fig. 112. 



Xiatocestus plehni, anterior end. X 9. 



" Uniformly opaque and rather dark brown in colour. Central 

 line darker. The margins are kept applied to surface on which 



