10 JÄDERHOLM, NORTHERN AND ARCT1C HYDROIDA FROM THE SWEDISH ZOOLOGICAL STATE MUSEUM. 



Selaginopsis mirabilis (Verrill). 



Localities: Novaja Semlja, Jugor Sharr, 10—14 fathoms, stones and shells, 31 /t 

 1875 (Sw. Nov. Semlja Exp.); Spitzbergen, Bel Sound, 30 — 40 fathoras, collector 

 unknown; Davis Strait, 63° 35' N., 52° 57' W. and 63° 47' N., 52° 26' W. at a depth 

 of 35—43 fathoms, 9 /c 1871 (Dr. J. Lindahl); Greenland, 66° 45' N., 59° 30' W., 35 

 fathoms, 25 /c 1883 (Sophia Exp.); d:o, Egedesminde 10 — 20 fathoms, stony bottom, 

 18 /t 1870 (Sw. Greenl. Exp.); d:o, Disco, Nordfjord, 27 fathoms, härd, grey clay, 10 / 7 

 1870 (Dr. J. Lindahl). 



Selaginopsis obsoleta (Lep.). 



Stem slightly geniculate. Branches regularly alternate and graded in such a 

 way as to give a plumose appearance to the colony. Hydrothecae arranged in six 

 longitudinal series, wholly immersed, narrowing toward the distal portion. Hydro- 

 theca margin toothless. 



Localities: Spitzbergen, Bel Sound, 30 — 40 fathoms, collector unknown; Bering 

 Sea, Kommandirski Islands, 55° 24' N., 165° 37, E., 75 fathoms, mud, n /s 1879 

 (Vega-Exp.). 



Hydrallmaiiia falcata (Lin.). 



Localities: Murman Sea, Lumbowski, 37 fathoms, ,J /a 1877, and Litza, 70 fa- 

 thoms, 5 s 1877 (Sandebergs Exp.). Represented in fine, big specimens. 



Nemertesia antennina (Lin.). 



Locality: Baffin's Bay, 67° 50' N., 57° 4' W., 132 fathoms, stones and clay, -*/i 

 1871 (Dr. .T. Lindahl). Five sterile colonies up to 15 cm high are present. 



Cladocarpus integer (G. O. Särs). 



Syn. Cladocarpus Hohnii Lev. 



Is found in two fertile colonies up to 20 cm high. The transverse folds of the 

 hydrothecal internodes and the intrathecal septum very variable, even in the same 

 hydrocladium. They are sometimes strongly marked as in the form described and 

 illustrated by Ritchie, 1 sometimes very slightly developed. 



Locality: Davis Strait, 63° 47' N., 52° 26' W., 35 fathoms, 9 / 6 1871 (Dr. J. 

 Lindahl). 



1 Ritchie, J., Some Northern Hydroid Zoophytes, pbtained by Hull Trawlers (Proc. Roy. Phys. Soc. 

 Edinburgh 1912), pag. 228 — 229. 



