Hydroids. collected by the “Tjatte* ’ Expedition 
to the west coast of Greenland in 1908 and 1909. 
By 
Paul L, Kramp. 
Rhizogeton nudus Broch. 
Rliizogeton nudum Broch 1909, b. 
? — nudum (?) Ritchie 1910. 
— nudum Kramp 1911. 
— nudus Dons 1912. 
Some few hydrants, witliout gonophores, on Halecium muri- 
catum from Godthaab Fjord, Stat. 52. This species has recently 
been dealt with thoroughly by Dons (1912), who gives the following 
distribution: northern Norway, Spitzbergen, North-East Greenland. 
In a collection of hydroids from Christmas Islands, Indian Ocean, 
Ritchie (1910) found a quite similar form; no gonophores were 
present, but the trophosome agreed exactly with Broch’s description 
of Rh. nudus, so that it seems very probable, that it has in faet 
been the same species, a very interesting discovery indeed. The 
species is so small, however, that it may easily be overlooked. It is 
possibly widely distributed, but has escaped the attention of the 
investigators. 
Coryne sp. 
On a Bryozoan. Stat. 419. 
Garveia groenlandica Levinsen. 
Levinsen 1892. Kramp 1911. 
Some hydrants, no gonophores, on Sertularella gxgantea , near 
Fiskenæs, Stat. 465. Levinsen mentions the species from Lille 
Hellefiskebanke. Also known from North-East Greenland. 
Vidensk. Meddel, fra Dansk naturh. Foren. Bd. 66. 
1 
