152 BEIT1SH FEESHWATER RH1ZOPODA. 



by careful illumination and the employment of a toler- 

 ably high power. 



3. Cochliop odium minutum Gr. S. West. 

 (Plate XXXII, figs. 12-14; and fig. 104 in text.) 



Cochliopodium minutum Gr. S. WEST in Jrn. Linn. Soc., 

 Zool. XXVIII (1901), p. 312, t, xxviii, ff. 6-10 (; </ 

 AVEKINTZEV in Trudui S.-Peterb. Obshch. XXXYI (1906), 

 2, P . 141). 



Very minute, with a cup-shaped delicate test 

 having a very wide mouth. Body-protoplasm granular; 

 pseudopodia somewhat irregular, usually attenuated 

 anteriorly. Nucleus absent. One or two vacuoles 



-. 



FIG. 104. Various phases of Cochliopodium minutum. Llyn-y-cwm- 

 ffynon, N. Wales. From drawings by G. S. West, x 520. 



present in some individuals, but entirely absent in 

 others. 



Diameter of test 12'4-13'5/A (West). 



Llyn-y-cwm-ffynon, N. Wales; April, 1900 (G. S. 

 West). 



Prof. Gr. S. West (whose description we quote) 

 records the finding of this species in abundance amongst 

 desmids, in washings of Isoetes from Llyn-y-cwm- 

 ifynon, N. Wales. The test- is structureless, very deli- 

 cate, and flexible, and assumes various unsymmetrical 

 shapes as it accommodates itself to the animal's move- 

 ments. Seen from above the test is usually circular, 

 but it frequently exhibits an irregularly undulate 

 margin. The pseudopodia consist commonly of some- 

 what flattened extensions of colourless ectoplasm, 



