Report on the Hydroids. 367 



Halecium curvicaule v. Lorenz. 

 Plate XXI, fig. 4. 



Y. Lorenz 1886 [41] p. 27. Taf. II, Fig. 3, 4. 



Jäderholm 1908 [34] ,. 16. Taf. II, Fig. 19—20. 



Broch 1909 [17] ,, 150 & 204, Textfig. 9, 10, 11. Taf. II, Fig. 2. 



Of this i)urely arctic species some small colonies are to hand 

 from 4 stations. The three largest colonies (St. 96) have the follow- 

 ing height, 3.2, 3.5, 4.0 cm. 



The proximal hending of the pedicel of the hydrotheca is not 

 ahvays ahrupt, often indeed very slight. Characteristic is the sharp 

 constriction of the lower part of the pedicel ; this constriction is also 

 distinctly seen in Broch's figures, less distinctlj' in v. Lorenz' and 

 Jäderholm's. In his original description v. Lorenz states, that the 

 perisarc is of a brownish colour; in the specimens of the Danmark 

 Expedition it is perfectly colourless and hyaline. 



Gonosomes not present. 



Hah.: St. 21, 63, 68 a, 96. 



Depth: 6—180 m., the largest colonies at 160—180 m. 



Geographical distribution: Arctic : North-East Greenland, 

 Iceland, Jan Mayen, Spitzbergen, Murman Sea. 



Not earlier known from Greenland. 



Haleciiim groeiilandicum n. sp. 

 Plate XXII. 



On a Bryozoan is a characteristic rhizome (PI. XXII, fig. 1), tiie 

 branches of which sometimes creep closely over the support, some- 

 times rise somewhat from it and ramify greatly, often almost at 

 right angles; the branches often bend downwards and attach them- 

 selves on to the support, to leave it soon again ; often the branches 

 also fasten themselves to each other, so that a web of intertwined, 

 densely ramified tubes is formed. These tubes bear single hydro- 

 thecae, which might form pseudohydrocauli (Schydlowsky's name for 

 rows of hydrothecae (öl)), and large, oblique gonothecae, often op- 

 posite in pairs (fig. 4). From the rhizome also issue erect, compound 

 stems. A little way up on the largest stem there is a bundle of in- 

 tertwined, densely ramified tubes with hydrothecae and gonothecae 

 just as on the rhizome (fig. 2); this bundle issues from the tubes of 

 the stem at several different places. The erect stems consist of sev- 

 eral, parallel, in part somewhat intertwined tubes, which commu- 

 nicate at several places (see fig. 2), and which by and by bend out- 

 wards to form branches. These are straight, not zigzag, and smooth 



