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Show 792 ON THE NON-MARINE FAUNA OF SPITSBERGEN. [June 15, ACARINA. A few very much damaged specimens of Oribatidae were found and submitted to Mr. A. D. Michael, who very kindly examined them. He says that although, owing to the imperfect preservation, he cannot be absolutely certain about the species, he feels pretty sure that they belong to Scutovertex hllineatus and Nothrus in-venustus. If these determinations are correct, both of these forms are new to the known fauna of Spitsbergen. ENTOMOSTRACA. Two species of Copepoda were found, representing the two families Harpacticidae and Cyclopidae. Of the former, unluckily, only a single damaged specimen was seen. It was very minute, measuring in its shrunken state -gy, aud was probably a male, but this could not be definitely determined as the first pair of antenna? had been torn off. Although apparently a new species, a proper account of it cannot be given, owing to the imperfect condition of the specimen. The other Copepods belonged to the genus Cyclops. Four individuals in all were observed, from as many different collections, three by myself and one by Mr. Bryce. Of the former, two were adult males of Cyclops blsetosus, Behberg (as defined by Schmeil, " Deutschlands freilebende Siisswasser Copepoden," Theil i. 1892), and the other a young individual with 10-jointed antennas, and without much doubt also a male of the same species. The most peculiar feature in connection with the two adult specimens was, that although undoubtedly C. blsetosus, both of them exhibited malformations. Thus in one example both of the fifth pair of feet were abnormal, and also differed considerably from one another. In the other specimen the feet of the fifth pair were quite normal, but the two largest tail setae were unusually thickened near the base, and at a point on the protopodites of the fourth pair of feet, where there should be one thick spine, there were two on the right foot and none on the left. It may be useful to note that C. blsetosus is usually found in this country in little temporary pools with a thick growth of amphibious grasses and other vegetation, but I have also found it occasionally by washing damp mosses. INSECTA. The only adult Insects found were Collembola or Spring-tails. Numerous specimens of a perfectly white species were present iu some of the collections, and also a few examples of a black species, but they have not yet been determined. In addition to these, two or three Dipterous larvae were obtained. EXPLANATION OF PLATE XLV. (p. 791). Fig. 1. Echiniscus spitsberyensis, n. sp. Dorsal view of an empty skin. X300. Fig. 2. „ „ Ventral view of posterior body-segment, showing fourth pair of feet. X 600. Fig. 3. „ „ One of the two median claws, showing small accessory hook. X 800. |