6 BRITISH FRESHWATER RHIZOPODA. 
and certain of the Aawbe, in which often no ectoplasm 
can be distinguished. Under certain circumstances 
even here, “ such a hyaline external plasma-layer makes 
its appearance, and this consequently must have-been 
produced from the granular plasma in the way in 
which, locally bounded, a hyaline pseudopodium is 
evolved from the body of a Rhizopod consisting of 
granular plasma.” Concerning the external limita- 
tions of the Rhizopod body, he says that it is naked, 
‘but it would appear that by contact with water,” as 
Dr. Wallich had previously shown, “a stiffening of the 
plasma takes place at the periphery, preventing its 
Fig. 1— Portion of the periphery of Pelomyra palustris when at 
rest, with the endoplasm (en) and ectoplasm (ec) sharply defined 
as frequently seen, and an outer fringe of minute projections 
from the latter. x about 150. 
deliquescence, and also causing an immediate closure 
of the cut surface, in case of artificial division. When 
the protoplasm ‘issues forth in a broad process, in the 
form of pseudopodia, the former bounded portion dis- 
solves in the advancing plasma, to become re-formed at 
the same moment.” 
This author acknowledges the prior claim of Dr. 
Wallich to the discovery. Dr. Wallich was also the 
first to explain the production of the nutritive vacuoles, 
by assuming that a drop of water is carried in along 
with the -incepted food-particles, and that this exerts 
the known stiffening action upon the portions of plasma 
surrounding the bodies incepted, “so that every nutritive 
vacuole appears to he lined with an ectosarcal layer.” 
