VAMPYRELLIDA. 95 
Body discoid, granular and reddish as in the preceding 
genus, variable in outline, usually oval, consisting of 
a mobile endoplasm which contains numerous vacuoles 
and is surrounded by a zone of colourless transparent 
ectoplasm. 12. Hyalodiscus. 
Nucleated organisms frequently with an external 
mucous envelope, which adapts itself to the varying 
movements of the individual. Endoplasm sometimes 
much vacuolated ; pseudopodia sharply pointed. 
13. Nucleariv. 
Organism distinguished by the possession of a 
chlorophyl corpuscle, which apparently represents the 
nucleus. Forming colonies by tetraschistic division. 
14. Archerinca. 
Genus 11. VAMPYRELLA Cienkowski, 1865. 
Amuwba (pars) Fresenius in Abh. Senckenb. nat. Ges. II 
(1856), p. 258. 
Vampyrella Crenxowsk1 in Arch, f. mikr. Anat. I (1865), 
p. 206. 
Body actinophrys-like or polymorphous, plastic, and 
capable of much variation; possessing an obscure nu- 
cleus or scattered nuclear substance, but destitute, in 
most cases, of a contractile vesicle. Protoplasm granu- 
lar, permeated with a reddish pigment, and containing 
food-corpuscles and oil-like globules of variable size. 
In certain species fusion of two or more amceboid 
individuals takes place immediately upon contact, form- 
ing plasmodia. 
The reddish colour present in nearly all the Vampy- 
relle distinguishes this genus from other naked Gymno- 
myxa. All are chlorophyl feeders. They differ from 
the Amebe im the character of their pseudopodia, 
which, as a rule, are very fine and very mobile. The 
habit of forming plasmodia by fusion of individuals is 
particularly noticeable in one species of Vampyrella. 
