1901.] NATURAL SCIENCES OF PHILADELPHIA. 145 



Ives: " Echinoderms and Crustaceans collected by the West 

 Greenland Expedition of 1891." 2 



Peary Auxiliary Expedition of 1894, published by A. Ohlin : 

 Bidrag till Kaennedomen om Malakostrahjaunan i Baffin Bay och 

 Smith Sound, Lund, 1895. 



A number of species has been mentioned by Hansen from near 

 Cape York in H. J. Hansen, " Maiacostraca marina Groen- 

 landise occidentalism ' 3 



The collections described here have been made by Prof. William 

 Libbey and the writer, by means of small hand dredges and a 

 larger beam-trawl, surface and dip nets. Since the chief value of 

 the material collected lies on the zoögeographical side, I shall take 

 particular pains to give an account of the previously known facts 

 of distribution in every species. 



CRUSTACEA. 



1. Branchinecta paludosa (Mueller). 



Packard, 12th Ann. Rep. U. S. Geol. Surv. Terr, for 1878 part 1, 1883, 

 p. 336, PL 9, 10, figs. 1-5. 



Station 13. Payer Harbor, Ellesmere Land. Fresh- water ponds 

 (several hundred). 



Station 46. Northumberland Island. Fresh- water ponds (many 

 hundred). 



Distribution. — Finmark, Lapland, North Siberia (Taimyr), 

 Point Barrow (Alaska), Cape Krusenstern (Arctic America), 

 Labrador, Grinnell Land, North and West Greenland. 



Grinnell Land: Discovery Bay (Miers) ; North Greenland: 

 Polaris Bay (Packard). 



2. Lepidurus glacialis (Kroeyer). 



Packard, I c, p. 316, PL 16, fig. 1. 



Station 46. Northumberland Island. Fresh- water ponds (46). 



Distribution. — Lapland, Novaja Semlja, Spitzbergen, South and 

 West Greenland, Cape Krusenstern, Point Barrow. 



There are Cladocera (a fresh -water Daphnia, possibly reetispina 

 Kr., from Stations 13 and 46) and a number of marine Ostracoda 

 and Copepoda in the collection which have not yet been identified. 



3 Proc. Acad. Nat. Sei. Phila., 1891. 



3 Vidensk. Meddel. fra den naturh. Foren, i Kjoebenhavn, 1887. 



