370 P- Kramp. 



Halecium sp. (tenellum Hincks aff.) 

 Plate XXIII, figs. 1, 2. 



The liydrocauli issuing from the fihform stolon are ver}' fine 

 and hyaline ; not more than 0.55 cm. high,with few, slender branches, 

 which at all events in their distal part are divided into hourglass- 

 shaped nodes by alternatel}^ sharp and less sharp constrictions ; everj' 

 branch rises either in or closely under a hydrotheca, and they all 

 lie nearly in the same plane. The hydrothecae are small, with very 

 much everted rim , diameter ca. 0.19 mm. ; the distance from the 

 rather few chitinous warts to the aperture is about a third of the 

 diameter of the rim. 



Gonosomes are not present. 



The specimens to hand have a great likeness to H. tenellum Hincks. 



Compare: Hincks 1868 (28) p. 22(5. PI. 45, fig. 1. 



Jcäderholm 1909 (35) p. 55. Taf. IV, Fig 12. 



Of this beautiful little species a few small sterile colonies on 

 Delesseria are to hand. 



Hah.: St. 63. 



Depth: 20—40 m. 



Geographical distribution of H. tenellum: Arctic: West 

 Greenland, Jan Mayen, Iceland, White Sea, Kara Sea. — Cosmopolitan. 



Halecium sp. (miiiutum Broch all.) 

 Plate XXIII, figs. 3, 4. 



The erect hydrocaulus is 0.44 cm. high ; ca. 0.25 mm. below 

 each hydrotheca there is a ring-shaped constriction, otherwise the 

 hydrocaulus is quite smooth with some slender branches. The 

 small hydrothecae have a very much everted rim (diameter ca. 0.15 

 mm.); the distance from the chitinous warts to the aperture is about 

 ^/5 of the diameter of the rim. 



Gonosomes are not present. 



Compare: Broch 1903 (14) p. 4. Taf. I, Fig. 1—4. 

 1909 (17) p. 153. Textfig. 13, 14, 15. 



Of this species only a single colony on Sertnlaiella gigantea is 

 to hand. 



Hab.: St. 96. 



Depth: 160— 180 m . 



Geographical distribution of H. minntnm: Arctic: Spitz- 

 bergen, Iceland. — North Atlantic, Europe. 



Fam. Lafoëidae. 



This family is nearly related to the following. It is character- 

 ized by the gonothecae being grouped together in aggregates. In 



