THE PROTEOMYXA 



to the Mycetozoa. Taking into consideration the form assumed by 

 the pseudopodia, the habit of plasmodium- formation, as well as 

 the character of the zoospores, most of the other genera can be 

 arranged around these as central types. But there still remain 

 some forms whose affinities are at present quite obscure, and these 

 must be separated for the present into a group by themselves. 



The genera are here arranged in five groups according to their 

 supposed affinities with the other orders of Protozoa. 



GROUP A. 



The following two genera appear to have affinities with the Gymna- 

 moebida. 



Nothing whatever is known concerning their life-history, and it is 

 probable they will prove to be but a stage in the life-history of an Amoeba. 



Protamoeba, Haeckel, is like an Amoeba, but without any definite 

 nucleus or contractile vacuole. Freshwater and marine. 1 10 /x (Penard). 



Gloidium, Sorokin (Fig. 5), differs from Protamoeba in possessing a 

 contractile vacuole. Occasionally the surface is denticulated. Fresh- 

 water, 71 fj.. G. inquinatum, Penard, 385 p. The genus Gringa, Frenzel, 

 is probably a species of Gloidium. 



FIG. 5. 



Four stages in the division of Gloidium qitadrifidum. c.v, contractile vacuoles. (After 

 Sorokin.) 



GROUP B. 



The genus Monobia in this group is closely related to Heliozoa. 

 Monopodium and Vampyrella are closely related to one another, 

 and agree with Vampyrellidium and Pseudospora in having a stage 

 with delicate radiating pseudopodia like an Adinophrys. Leptophrys 

 has affinities with Vampyrella, but differs from it in the shape of the 

 body, which is irregular. Myxastrum is in some respects intermediate 

 between the genera included in this group and those in Group D. 



(IV.) l Monobia, Schneider (Fig. 4). A number of Actinophrys-like 

 individuals, but without nucleus or contractile vacuoles, and of a bluish 



1 As the genera included in the Proteomyxa in this volume have been shifted 

 about from one class to another by different authors, the roman figures in brackets 

 have been introduced to indicate to the reader the position assigned to each genus by 

 the leading writers on Protozoology, when it differs from that given to the same genus 

 iu the text. Thus the genera marked (I.) were referred to the Monadineae azoosporeae, 

 (II.) to the Monadineae zoosporeae of the Mycetozoa by Zopf ; (III.) to the Foraminifera 

 nuda by Rhumbler (22) ; (IV.) to the Heliozoa by Biitschli and Schaudinn. 



