128 



BHITISH FRESHWATER RHIZOPODA. 



cysted, the body-protoplasm exhibiting the form of a 

 globular mass in the widest part of the shell." This 

 it may be assumed from Lang's figures would be the 

 form assumed in N. triangulata on the encystment 

 of the plasma. 



Both these forms should be compared with the Nebela 

 bipes of Carter (see p. 98). If we assume that to be a 

 good species and not a malformation, they may only be 

 varieties of it, differing chiefly in the plates of the test 

 being angular instead of circular. If so it is curious 



FIG. 101. Nebela triangulata var. bicornis. After G. S. West, loc. cit. 

 (reduced to one-half) . A and B, front views of two examples ; c and 

 D, side views ; E, oral view, x 260. 



that they should have been found only at distances 

 so wide apart, N. bipes in Devonshire and Scotland, 

 triangulata in Berkshire and Ireland, and bicornis 

 much more nearly allied to triangulata than that is to 

 bipes in Scotland. 



Drawings and descriptions of the two forms were 

 sent by the writer to Mr. Cash, but unfortunately too 

 late for him to consider them.] 



