196 DR. WALLICH, ON AMG@BA. 
tractile vesicle appeared merely as an internal fissure in the 
sarcode-substance, and the existence of numerous vacuoles, 
which continually form and coalesce, or disappear, whilst 
under observation, seem to bear out this view of its nature. 
Dr. Wallich also confirms Mr. Carter’s view, as opposed to 
that of Lachmann and others, that the contractile vesicle in- 
variably discharges itself externally, the orifice being extem- 
porised and of very minute proportion. On treatment with 
acetic acid and other reagents, no trace of a membranous en- 
velopment to the sarcode-substance could be discovered, such 
as has been described by Auerbach in A. dilimbosa; but Dr. 
Wallich found that, by improper adjustment of the focus or 
want of proper illumination, the semblance of a double line, 
indicative of a true membrane, could be produced. 
He gives his conclusions on the relations between the ec- 
tosare and endosare in the following words :—“ From these 
facts it is obvious that the ectosarc and endosarc are not per- 
manent portions of the Protean structure, but mutually con- 
vertible one into the other; and that it is an essential feature 
of sarcode that, whilst the outer layer for the time being be- 
comes, ipso facto, instantaneously differentiated into ectosare, 
the same layer reverts to the condition of endosare under 
the circumstances just described”—alluding to the forma- 
tion of food-orifices. In the granular contents of the proto- 
plasma, Dr. Wallich found numerous rhombohedral crystals, 
about ==1,,th of an inch in length, probably of lime. Such 
crystals he has also observed in Huglypha, Arcella, and Acan- 
thometra. As is well known, Professor Huxley observed 
prismatic crystals in Thalassicolla. Certain bodies, which 
Dr. Wallich terms ‘nucleated corpuscles” (probably iden- 
tical with the discoid ovules of Carter), were also found; 
their function is, perhaps, connected with reproduction. 
Other corpuscles, larger and nucleated, about thé -,,th an 
inch in diameter, were met with. These he has termed 
sarcoblasts, and considers them allied to the “ yellow bodies” 
of Foraminifera, Polycystina, Thalassicollide, &c. In sound- 
ings from the Atlantic bed Dr. Wallich met with minute 
discoidal structures (previously detected by Professor Huxley), 
which he termed coccospheres, and believed to be a step in 
the reproductive process of Foraminifera. He now thinks it 
highly probable that the sarcoblasts first become cocco- 
spheres, or something equivalent, and are then developed into 
the perfect animal. This subject, however, he is about to 
work out. Dr. Wallich’s observations are of the greatest 
importance. The discovery of this new form of Ameeba, 
with the peculiarities of structure it presents, places the 
