90 PROGRESS OF MICROSCOPICAL SCIENCE. 
in the ooze of the rocky shores of the Schuylkill River, in sphagnum 
swamps, in marsh mud, &c. It is remarkable for its sluggish character ; 
and in appearance reminds one of a little pile of epithelial scales, or 
fragment of dandruff from the head. Appearing quadrately oval or 
rounded, transparent, and more or less wrinkled, or marked with deli- 
cate wavy lines; the pseudopods rise in short obtuse mammillary 
eminences or wave-like ridges, the summits of which are composed of 
transparent ectosarc, while the central portion of the body is occupied 
by a thin, pale, diffused, and finely granular entosare. This contains 
one or more vesicles, usually one, which very slowly enlarges, and 
then less slowly collapses. In addition, as part of the structure, an 
oval granular nucleus is sometimes visible. The food contents gene- 
rally appear not to be abundant, and often the creature appears to be 
empty of food altogether. The character of its food is the same as 
with other species of Amceba. It not unfrequently feeds on Dif- 
flugians. In a specimen from sphagnum water, from Vineland, N.J., 
last August, he observed an individual, about the 5 of a millimeter, 
containing a Difflugia and a Trinema together. As observed by him, 
the species ranges from ,', to 4 of a millimeter in diameter. On 
the morning of August 27, from some mud adhering to the roots of 
Sparganium, obtained the day previously in a nearly dried-up marsh, 
at Bristol, Pa., he obtained a drop of material for examination with 
the microscope. After a few moments he observed an Ameba verru- 
cosa, nearly motionless, empty of food, with a large central contractile 
vesicle, and measuring =), of a millimeter in diameter. Within a 
short distance of it, and moving directly towards it, was another and 
more active Amceba, the species of which he was not positive. It was, 
perhaps, the one described by Dujardin as A. limax, by which name, 
for the present purpose, it may be called. As first noticed, this Amoeba 
was limaciform, 1 of a millimeter long, with a number of conical 
pseudopods projecting from the front broader end, which was y', of a 
millimeter wide. The creature contained a number of spherical food 
vacuoles with sienna-coloured contents, a large diatom filled with 
endochrome, besides several clear vacuoles, a posterior contractile 
vesicle, and the usual granular entosare. The A. limaz approached 
and came into contact with the motionless A. verrucosa. Moving to the 
right, it left a long finger-like pseudopod curved around its lower 
half, and then extended a similar one around the upper half until it 
met the first pseudopod. After a few moments the ends of the two 
pseudopods actually became connate (the second time he had observed 
this phenomenon), and the A. verrucosa was enclosed in the embrace of 
the A. limaz. The latter assumed a perfectly circular outline, and after 
awhile a uniformly smooth surface ; but the central contractile vesicle 
remained in the same condition, nor did he once observe it enlarge or 
collapse. The A. limax now moved away with its new capture, and 
after a short time what had been the head end contracted, became 
wrinkled and villous in appearance, while from what had been the tail 
end a number (ten) of conical pseudopods projected. The A. verrucosa 
assumed an oval form, and the contractile vesicle became indistinct, 
without collapsing. Moving on, the A. limaaw became more slug-like in 
