216 ME. G. H. WAILES ON EKESHWATER 



Length 155-190 yu.; breadth 100-142 //- ; aperture 32-50 a; thickness 

 0'5 to O'G o£ the breadth. 



The proportions o£ the test vary considerably, the breadth ranging from 

 0*6 to 0'8 of the length, the narrow tests having an ovoid outline. The 

 average of 13 tests gave : length 175 fi, breadth 128 /ll, aperture 38 /ju ; 

 two tests each 170 /u, in length measured 100 fi and 140 fi in breadth 

 respectively. 



This variety is distinguished from iV. dentistoma var. lacustr'is, Wailes (16), 

 by the absence of any definite neck and by the structure of the test, which 

 consists of small plates with regular outlines. 



Distribution. — Puntas Arenas ; Mt. Corcovada, Kio Janeiro (sphagnum). 



Nebela Muekayi, sp. nov. (PL 15. figs. 18, 19.) 



Test of medium size, broadly pyriform, compressed, nearly colourless, 

 usually formed of oval or circular plates ; in broad view nearly circular, 

 with a short, wide, parallel neck ; furnished with two orifices on each side 

 situated in depressions at the base of the neck, each pair of orifices contracted 

 by an internal tube ; the neck bearing a variable number of small circular 

 granules ; the test in narrow side-view having a slightly protuberant apex, 

 widening to the centre of the body thence tapering gradually to the neck; 

 transverse section elliptical ; aperture elliptical with thickened lip ; plasma 

 grey, granular, containing numerous food-particles ; nucleus moderately 

 large with several nucleoles ; pseudopodia not observed. 



Length 120-136 fx ; breadth 95-100 /x ; aperture 30-35 jju ; thickness 

 about half the breadth. 



Distribution. — Puntas Arenas ; Mt. Papagaio, Hio Janeiro. 



This species belongs to a group of Nebelse in which the curious lateral pores 

 are characteristic ; the other members ore A^ bigibbosa, Penard, N. mariiali, 

 Certes, JS'. Certesi (Certes), Penard, but none of these were found in the 

 gatherings under examination. So far as is known at present N. bigibbosa is 

 peculiar to the Northern Hemisphere, and N. Certesi to the Southern ; the 

 latter and N. martiali are also distinguished by the presence of the small 

 nodules on the neck. N. Certesi has in addition tubular channels running 

 up the neck from the aperture, and the lateral internal tubes are sometimes 

 only rudimentary. 



Nebela spicata, sp. nov. (PI. 15. figs. 14, 15, 16.) 



Test of medium size, of a grey colour, ovoid, moderately compressed, 

 formed of various-sized oval or irregularly shaped scales ; the crown circular, 

 furnished with a single row of 6-8 hollow spines ; test in narrow side-view 

 pyriform ; transverse section elliptical, ratio of axes about 5:3; aperture 

 broadly elliptical with undulate margin bordered by a row of OA^al scales ; 

 plasma normal ; pseudopodia not observed. 



