RHIZOPODA FROM THE SEYCHELLES. 159 



Nebela tubulata, Broivn. (Journ. Linn. Soc, Zool. xxxii. (1911), p. 79.) 

 Several were seen. Length about 60 yu,. 



N. TUBULOSA, Penard. 



Not uncommon. Length 175 /a. 



Genus Phryganella. 



Phryganella hemispherica, Penard. 



Numerous, but no living individuals were observed. Diameter 30—60//-, 



Genus Plagiopyxis. 



Plagtopyxis labiata, Penard. (Brit. Antarctic Exped., Biol. vol. i. pt. 6 

 (1911).) 



Several were seen. Certain forms o£ Di§iugia constrida approach this 

 species very closely in the form of the test ; a study of active individuals is 

 desirable for ascertaining the exact relationships of this species. Diameter 

 55-80 /A. 



Genus Quadrula. 



Quadrula symmetrica, F. E. Schidze. (PI. 12. fig. 45.) 

 All the observed tests were of an elongated type ; the larger scales varied 

 from 8-10 fx, in breadth. Length 84-90 /j,. 



Genus Trigonopyxis. 



Trigonopyxis arcula (Leidi/), Penard. 



Syn. Difflugia arcula, Leidy, Rhiz. North Amer. 1879. 



Trigoiiopyxis arcula, Penard, Revue Suisse Zool. 1912. 



Occurs numerously. This Ehizopod, which occupied an anomalous position 

 among the Diffliigice, has been placed by Penard in a new genus. Diameter 

 80-135 /i ; aperture regularly trilobed. 



Family E u g l y p h i n a. 



Genus Assulina. 



Assulina muscorum, Greeff. 

 Numerous. Length 40-45 fju. 



Genus Euglypha. 



Euglypha alveolata, Dujardin. 

 Rare. Length about 60 /x. 



LINN. JOURN. ZOOLOGY, VOL. XXXII. 14 



