INVERTEBEATES. 33 



Branchipus paludosus, Baphnia longispina, and the new species Biaptomus amUguus, 

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

 Eurycercus glacialis, which, however, has also been found in Greenland arid Vaigatch 

 Island-, at the entrance to the Kara Sea. 



The crabs have been identified by Mr. J. B. Benedict, as follows : Oregonia gracilis 

 Dana; Telmessiis cheiragonus {Tilesias.); Hupagurus gilli Benedict; Eupagurus hirsu- 

 tiusGulus (Dana);- Eupagurus middendorfii Brandt; Eupagurus nudosus Benedict; and 

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

 Sc. St. Petersb., xxxv, Ko. 2, 1892, p. 335, fig. 3). Schalfeef identifies another species 

 of Hapalogaster, also collected by Mr. Grebnitski on Bering Island, as H. mandtii. 



MOLLtrSKS. 



Among the invertebrates, the mollusks have been most extensively collected 

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

 Grebnitski 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. 

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

 gives a full list of the species, including those of the Yega expedition, which have 

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

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

 Yitrina exilis; Hyalina radiatula; Gonulus fulvus, var, ; Patula ruderata, var. pauper; 

 Pupilla decora and arctica; Acanthinula harpa; Limncea ovata; L. humilis; Pisidium 

 equilaterale. The new species described from Bering Island by Aurivillius is Pleuro- 

 toma heringi; and by Dall, in his first paper, Lacunella reflexa (p. 344, pi. ii, fig. 1-3), 

 Gerithiopsis stejnegeri (p. 345 pi. ii, fig. 4), and Stromhella callorhina var. stejnegeri (p. 

 346, pi. II, figs. 5, 6). 



An additional species of cephalopod may be recorded here. In 1896 I obtained 

 two specimens taken at Copper Island, which Dr. Dall informs me seem to agree 

 with the description of Onychoteuthis bergii Middendorff, described from Kamchatka. 



WOEMS, 



At least one species of earthworm occurs, and several leeches, but, like the rest 

 of the lower invertebrates collected they have not been reported upon as yet. Wir^n 

 has described a new species of chsetopod from Bering Island, viz, Potamilla neglecta 

 (Vega Exp. vet. lakt. ii, 1883. p. 422). 



SPONGES. 



A new variety (arctica) of Esperia lingua has been described from Bering Island 

 (5-10 fathoms) by Pristedt (Yega Exp. Vet, lakt., iv, p. 449, pi. xxv, figs. 20-24; pi, 

 XXIX, fig. 18). 



Mr. Lambe has worked up the sponges which I brought home, among which was 

 one new species Polymastia laganoides, from Bering Island (Lambe, op. cit. p. 129, pi. 

 IV, figs. 5, 5 a-c}. The other Commander Island species euumerated by him are: 

 Halichondria panicea; Emnastia sitiens; Beniera rufescens; Esperiopsis quatsinoensis; 

 Chofidrocladia alasTcensis; and Suberites ooncinnus (Lambe, Sponges from the "Western 

 Coast of North America. <Trans. Eoy. Soc. Canada, Sec. iv, 1894, pp. 113-138, pis, 

 ii-iv). The sponges brought home by me in 1897 have also been examined by Mr. 

 15183, PT 4 3 



