SOILS AND MOSSES OF SPITSBEBGEN. 469 
cultures in which only active individuals could be found the identification is 
consequently incomplete. The common soil species Ncvgleria (Dhnastiffaviceba) 
grulieri (Schardinger) Alexeieff was found in two of the soil samples, and 
the very similar form Hartmanella ]i.yalina Alexeieff in three of the mosses. 
A characteristic small species described in a recent paper (12) as sp. a also 
occurred in one of the moss samples. Unfortunately this organism does 
not grow very well in cultures, and consequently it is still impossible to 
complete the description of it, or to name it satisfactorily. 
Ama^a limicola Rhumbler. — This species occurred in only one culture and 
was smaller than usual, being only about 20 yu. in diameter when rounded. 
Amceba cesjyertilio Penard. — Penard records this species as being present 
" en assez grand abondance " in his Spitsbergen material, but in the present 
investigation it was found in only one moss sample. The specimens examined 
were nearly all in the radiate form when first observed, but passed over into 
the more active non-radiate form when transferred to a slide for closer 
examination. In the latter condition the avei-age length was about 60 fi. 
One sample of moss from Prince Charles Foreland gave a few specimens 
of a smaller amoeba which may belong to this species. When active this 
animal is constantly and rapidly changing its shape, but does not progress. 
The pseudopodia are numerous and are of two kinds — narrow finger-like ones 
reaching about 20 /j, in length, and other very fine ones which are even 
longer. At times the auKTebaj become rounded and motionless, with very 
short finger-like pseudopodia projecting all over the body. The diameter is 
then from 18 fi to 30 /a. There is apparently only one contractile vacuole, 
which is situated near the middle of the body and at times reaches a very 
considerable size. 
Amceba terricola Greef occurred in three soil samples and in one mos.s. 
They were all perfectly typical except in size, in which respect they mostly 
agreed with those found by Penard. The specimens from the mosses were 
usually about 50 im in diameter and those from the soils even smaller (20 /i). 
Soil sample 4 (1922) contained a few full-sized ones of 120 /u. in diameter, 
with a nucleus of 35/ixl8/i and a contractile vacuole which at times 
reached a diameter of 50 jjl. Though encystment is unknown in the European 
members of this species, it apparently does sometimes occur, for the speci- 
mens found in the material brought back by the British Antarctic Expedition 
of 1907-1909 were all encysted (25). No cysts were found, however, in the 
material. 
Amceba striata Penard. — This beautiful aniceba occurred in its typical form 
in one of the moss samples. When progressing steadily its dimensions were 
about 60 /Ci by 36 m. The large contractile vacuole (diameter 12 fi) is charac- 
teristic of the species, but in the present case it was almost invariably 
single. Once only was it obsei'ved being formed by the coalescence of three 
smaller vacuoles. 
A single small specimen (length 30 /^t) was found in another sample from 
the same locality. 
