rrihe present paper gives an account of a collection of Hydroids, sent to me for 

 X identification by Professor Dr. T. Odhner, Superintendent of the Swedish Zoo- 

 logical State Museum. This collection consists of Hydroids collected by several 

 Swedish expeditions in various parts of the Arctic Regions and North Atlantic 

 Ocean. The most interesting of this material is a collection from Arctic America, 

 obtained by Dr. J. Lindahl in 1871. 



All the Hydroida which ha ve been placed at my disposal have proved to be 

 of previously known species, but are nevertheless to a certain extent of interest, as 

 amongst other things they further the knowledge of the Geographical distribution 

 of the Hydroida. Therefore the following report may be regarded as a supplement 

 to my account of the Hydroida in »Northern and Arctic Invertebrates in the Col- 

 lection of the Swedish State Museum» in Kgl. Sv. Vetensk. Akad. Handl., Bd. 45, 

 N:o 1. 



fiudeiidrinm ranieiuii (Pall.). 



Colonies strongly and irregularly branched with a thick, fascicled main stem. 

 The small branches have a few annulations at their origins, but are elsewhere smooth. 

 The hydranths bear 18 — 22 tentacles. Gonophores not found. 



Localities: Kära Sea, 74° 30' N., 73° 25' E., 17 fathoms, sand and clay, Sept. 

 1876 (Nordenskiölds Exped.); Greenland, Disco, Nordfjord, 161 fathoms, grey clay, 

 July 11, 1871 (Dr. J. Lindahl). 



Haleciiini labrosum Ålder. 



Localities: Kola, Lumbowski, 10 /s 1877 (Sandebergs Exped.), sterile specimens 

 covered with Calycella syringa and Campanularia volubilis; Spitzbergen, Norwegian 

 Islands, 18—25 fathoms, 19 / 8 1872 (Swed. Exped. 1872—73), abundant with male 

 gonothecae. 



