306 E. PENARD ON SOME RHIZOPODS FROM SIERRA LEONE. 



existence, there is a good probability of their being found ; but 

 they are not cosmopolitan in reality, for many species are confined 

 to a very limited area ; such-and-such a species, for instance,, 

 described from some island in the Pacific Ocean, will have no- 

 chance at all of being found in Europe. 



But Rhizopods, like other Protozoa, have this privilege, that 

 one at least of the reasons that exclude higher animals from 

 many countries, namely, difficulty of transportation, has no, or 

 PL very feeble, role to play in their case. 



If, before the arrival of Europeans, rabbits, to take an ex- 

 ample, were not found in Australia, wdiere they came afterwards 

 to live only too well, this was owing to the impossibility of their 

 coming ; but Protozoa will go everywhere, be transported to any 

 distance by wind. Only they must fall on the right place ;. 

 most of them, truly, will be content with any pond or swamp, 

 but others must have the moss of big forests, woods, or the Avails 

 of old ruins, or sphagnum, or the pure water of glacial lakes,, 

 etc., and, in the case of our >Sierra Leone Khizopods, one might 

 ask if the conditions for their prosperity would not be : slow river,, 

 warm water in a torrid, damp climate ? 



As such conditions can only be fulfilled in a very limited- 

 number of stations, and the investigation of such countries as 

 the tropical coast of West Afiica has been until now, as regards 

 Khizopods, next to nothing, good results might be expected from 

 a thorough examination of further collections. I hope, for my 

 part, that Mr. G. H. Wailes will find time and opportunity to 

 study the subject, and that the present short notice will be- 

 followed by more complete and important descriptions. 



Description of Plates 9 and 10. 



Fig. 1. ? Centrojrijxis arcelloides. 

 2 '^ 



5) 

 5J 



?) 



55 

 55 



3. Pontignlasia compr'essa. 



4. Lesquereiisia spirali'^. 



5. Dijjiiigia i^yriformis^ var. 

 (3. ,, I'mgula. 



7. Lesquereusia mimeiica. 



8, Dijfiugia echinulata. 



Joiirn. QacUtt Microsvopical Ciab, l^cr. 2, Vol. XL, No. 09, Nocmbcr 1911. 



