299 



ON SOME RHIZOPODS FROM SIERRA LEONE. 



By Dr. E. Pexard, of Geneva. 



{ReadJniic 11th, 1911.) 



Plates 9 and 10. 



1 am indebted to Mr. G. H. Wailes for some sediment which was 

 -collected by his brother, Major W. E. Wailes, from a " slow, 

 large river containing weeds " at Sierra Leone. 



In the material which I examined, fourteen species of freshwater 

 Khizopods were found ; and as three of them are new, and four 

 at least might be considered as special forms or varieties, it is 

 ^desirable, I think, to give here, with the kind permission of 

 3Ir. Wailes, the result of my observations.* 



The species found were the following : 



Centropyxis aculeata Stein. 



,, arcelloides Penard. 



Diffliifjia acuminata Ehrenberg. 



constricta (Ehrenberg) Leidy. 



echinulata sp. nov^ 



,, lingula sp. nov. 



,, pyriformis Perty. 

 Euglypha alveolata Dujardin. 



,, laevis (?) Perty. 

 Lesquereusia mimetica sp, nov. 



modesta Rhumbler. 



,, spiralis (Ehrenberg) Biitschli. 



Pontlyulasia, compressa (Carter) Cash. 



,, vas (Leidy) Schouteden. 



Of these fourteen species, seven, as said before, might be con- 

 ^sidered as showing the normal type ; and yet none of these seven 

 was absolutely typical. Centropyxis acideata, Lesquereusia modesta, 



* The material was very scanty, and I have no doubt that this list of four- 

 teen species does not give a full idea of what was contained in the original 

 -collection. Mr. Wailes, I hear, will very likely receive more, from different 

 parts of the colony ; certainly he will be able to add many species to the 

 .list and to prepare, I hope, an important report on the subject. 



