ON SHEPHEARDELLA^ A NEW TYPE OP MARINE RHIZOPODA. 137 
established and difierentiated into eiidosarc and ectosarc, 
crawled with impunity into actual contact with the pseudo- 
podia of the other Shephear della, which had up to this date 
retained its normal form, without in any one instance 
becoming absorbed, as was the case in their earlier stages. 
During the night preceding December 18th the second 
specimen began to change its form. Its appearance at 9 a.m. 
on that day is represented in PL XV, fig. 7. The sarcode had 
entirely left one portion of the integument, and collected at 
the other extremity, which was much swollen in conse- 
quence. The nucleus could still be seen clearly, and the 
internal rotation went on in the sarcode, but, instead of two 
apertures, it now possessed at least four, from each of which 
pseudopodia w'ere emitted. The contraction of the sarcode 
continued slowly and steadily throughout the whole of this 
day and the next, the nucleus became more obscure as the 
protoplasm became denser, and finally was lost to view alto- 
gether, the pseudopodia being at the same time gradually 
withdrawn from the wrinkled end. At 7 p.rn. on the 19th 
the now much altered Shepheardella adhered to the cell hy a 
few pseudopodia from one end only, and had become broadly 
oval in contour, as in PI. XV, fig. 8, a, h. Examined twenty- 
four hours later, the integument had become completely 
emptied and lay in a wrinkled mass on the free end of the ex- 
uded sarcode (PI. XV, fig. 9, h, The naked body was 
adherent to the glass by its opposite extremity, and was deeply 
constricted in a quadripartite manner, and evidently about 
to subdivide. Further observations on this specimen were 
unfortunately prevented by the partial leaking of the cell 
and the consequent loss of the object. 
To return now to the first specimen, whose changes up to 
the evening of December 18th have been already noted. I 
found on the 19th, at 9 a.m., that it had once more divided 
into two subglobular masses, which continued to give out 
pseudopodia freely, especially under the influence of the 
warmth and light of a lamp, until the 27th, when the only 
remaining evidence of life observable in them ^vas a feeble 
swarming among the granules of the sarcode, and this also 
ceased after a day or two. After remaining motionless 
from December 29th until February 15th one of the masses 
suddenly gave evidence of life by emitting, whilst under 
observation,’ a lohose extension of protoplasm containing three 
enlarged granules. In a short time this travelled away as 
an Amoeba, within whose body the granules appeared as 
nuclei, no vesicle or vacuole being then present, hut, ex- 
amined again next day, the granules were found to be re- 
