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Show 1897.] NON-MARINE FAUNA OF SPITSBERGEN. 789 from the other collection, however, was colourless and appeared like fig. 26, on plate 37, of Leidy's ' Bhizopods of N. America.' TRINEMA ENCHELYS, Ehrbg. About as common as Euglypha ciliata and found in the same number of collections, namely eleven. The specimens exhibited a very considerable amount of variation. In a few collections a' form was seen which was larger than any of tbe ordinary specimeus, being -yjjo"? and characterized by the great development of the shell around the oral aperture. Leidy gives figures of forms probably identical with this (I. c. plate 39. figs. 41, 61, & 63 inferior views, and fig. 54 lateral view). It is probably also the same as Arcella disphcera, Ehrbg. ACTINOPHRYS SOL, Ehrbg. Specimens of this well-known Heliozoan occurred sparingly iu three of the collections. ACANTHOCYSTIS Sp. This was a very small species, y^W "•> with numerous delicate simple spines and a few long pseudopods. It was very similar to the drawing of an unnamed species given by Leidy (I- c. plate 43. f. 10), but was destitute of the envelope of granular protoplasm shown in that figure. According to the key given by F. Schaudinn (Heliozoa in ' Das Tierreich,' Berlin 1896), it comes nearest to A. spinifera, Greeff. This form was represented in three collections by a few specimens. CLATHRULINA ELEGANS, Cienk. Only a single detached capsule of this beautiful species was found. It was of a deep yellow colour, ^ L " in diameter, not quite spherical and with slightly irregular openings. It contained two encysted individuals. GROMIA sp. A specimen of a species of Gromia was seen by Mr. Bryce whilst searching for Botifers, but no further specimens could be obtained, and the species remains uncertain. In addition to the foregoing, a minute testaceous Bhizopod seen in two or three of the collections which may possibly have been Chlamydophrys stercorea, Cienk. In outline, size (jjft"), and absence of evident shell-structure it was about the same as the species named, but no pseudopods were seen, and it is therefore impossible to be sure even of the group to which it belonged. INFUSORIA. A fair number of Infusorians were noticed, but the group was not specially studied and no detailed account of it can be given. It may be noted, however, that the commonest form was either identical with or very similar to Uroleptus piscls, Mull. Ehrenberg, |