2 ARKIV FÖR ZOOLOGI. BAND 13. N:0 3. 



rical-pyriform of different sizes, spring from the hydrorhiza. 

 Unfortunately no medusae are perfectly developed. Conse- 

 quently the number of tentacles cannot be indicated. 



According to Vanhöffen, Campaniclava clionis always 

 occurs on Clio halantium in the tropical part of the Atlantic 

 Ocean, living in symbiosis mth this species. In the material 

 wliich has been placed at my disposal, the colonies also grow 

 on this pteropod. 



Locality: The Atlantic Ocean, between Africa and South 

 America, 4° 38^ N., 27° 15' W., '7^ 1892 (Capt. J. Meyer). 

 Rather sparingly coUected. 



Peiinaria Cavolinii Ehrenb. 



Locality: The Indian Ocean, between Batavia and Singa- 

 pore, 1853 (Eugenie-Exped.). Only small fragments. 



Halecium annulatum Torrey. Pl. 1 Fig. 2 — 3. 



Stems not fascicled, rising from a stolon to a height of 5 

 mm, irregularly branched. Stems and branches rather strongly 

 annulated throughout, 0,094 — 0,112 mm broad. Margin of the 

 hydrothecae everted-recurved, and measm^e in breadth 0,150 

 — 0,170 mm. Reduplications are common. Female gonothecae 

 broadly ovate, compressed, lenticular, with terminal aperture 

 and short pedicel. Gonophore with 8 — 10 eggs, surrounded 

 by blastostylar processes. The length of the gonothecae 0,8G0 

 — 0,900 mm, and the breadth 0,540 — 0,700 mm. 



Localities: Patagonia, Lennox Island, 10 — 25 fathoms 

 on seaweed. Also found at the mouth of a Notothenia from 

 Patagonia, but no fm^ther particulars as to locality. (Swed. 

 Exped. to Patagonia 1896.) 



Halecium flexile Allm. 



This is evidently the same hydroid as that described by 

 Hartlaub^ and myself^ as coming from Patagonia. Stems and 

 principal branches fascicled, smaller branches monosiphonic. 



^ Hartlaub, Cl., Die Hydroiden d. magalhaensiechen Region and chi- 

 lemschen Kiiste, pag. 611 — 613. 



^ Jäderholm, E., Aussereuropäische Hj^droiden im Schwedisclien 

 Reichsmuseum, pag. 265. 



