THE RUSSIAN FUK-.SEAL ISLANDS. 23 



MYRIAPODS. 



The three species broujjht home by me have been deteimiued by IJolliiiiiu. Lino- 

 twuia chionophila and Lifhobiun .s^/r/^jcv, both from Bering' Island, are known froru 

 otlier localities, but tlie species described by him as new, under the name of Lithobius 

 stejne(jeri, is the only one thus far found only on tlie Commander Islands (Bull. U. S. 

 Nat. Mus. No. 46, 1893, p. 199). 



AOARIDS. 



The acarids collected by the Vega expedition have been described by Kramer and 

 Neumau (Vega Exp. Vet. lakt., iii, 1883, pp. r)19-r)32, pis. xli-xliv). No less than 

 5 new species were described from Bering Island, 4 of which were found only on the 

 latter, as follows: Xeswa arcUca, Bdella villom, Ixodes horealin, I. Jimbrmttis, and 

 Gamanus arvticus. Of these 1 obtained only /. borealis. 



It was my intention to get as nearly complete a collection of spiders as possible, 

 and I succeeded in obtaining quite a number of sjiccies, which were turned over to 

 the United States National Museum. They were lent to the late Dr. Marx to be 

 determined, but the report was not finished before his death. 



CRUSTACEANS. 



The crustaceans collected have not been worked up as yet, except the entomos- 

 traca, which have been described by Prof. W. Lilljeborg, of Upsala, Sweden (On the 

 Eutomostraca collected by Mr. Leonhard Stejneger, on Bering Island, 1882-83. Proc. 

 V. S. Nat. Mas., x, 1887, pp. lol-15(!). Five species were collected, of which I found 

 Braiichi2)uii "pahidosus^ Dapluila Jowjiiipina, and the new species IMaptomus ambiguus, 

 in small fresh-water ponds at Ladiginsk, Bering Island. The other new species is 

 EurficeiTHs (jlacialis, which, however, has also been found in Greenland and Vaigatch 

 Island, at the entrance to the Kara Sea. 



The crabs have been identified by Mr. J. E. Benedict, as follows: Orcgonia gracilis 

 Dana; Tclmessiis chciragonus (T!i\esms) ; Eupagurus giUi Benedict; Eupagurun liirsii- 

 tiusculus (Dana); Eupagurus middcndorfii Brandt; Eupagurus nudosus Benedict; and 

 Hapalogaster grebnitsMi Schalfeef, recently described from Bering Island (Bull. Acad. 

 Sc. St. Pctersb., xxxv,No. 2, 1892, p. 335, fig. 3). Schalfeef identifies anotlier species 

 of Eapalogaster, also collected by Mr. Grebuitski on Bering Island, as M. mandtii. 



MOLLUSKS. 



Among the invertebrates, the mollusks have been most extensively collected 

 and most thoroughly reported upon. The Vega expedition obtained 26 species, Mr. 

 Grebuitski sent the National Museum 23 species, and I myself 45 species, out of a total 

 of 75 species thus far collected. Of these, 10 are land or fresh-water species. Dr. 

 W. H. Dall has published two reports upon the Commander Islands collections (Proc. 

 U. S. Nat. Mus., VII, 1884, pp. 340-349 ; and ix, 1886, pp. 209-219). In the last paper he 

 gives a full list of the species, ineluding those of tiie Vega expedition which have 

 been reported upon by Westerlund and Aurivillius. The sjiecies of land and fresh- 

 water mollusks thus far collected on the islands are: Limax {Agriolimax) hijperboretis; 

 Vitrina exilis; Eyalinaradiatula; Comilusftilvus,vdr.; Patula ruderata, vav, pauper; 



