42 



HYDROIDA II 



from an almost spherical apophyse situate close under the terminal hydrotheca. The hydrotheca itself 

 is low, somewhat broader at the aperture than at the faint diaphragm, more rarely with margin slightly 

 bent over. Secondary hydrothecse occur in smaller numbers. The hydrotheca stalks are as a rule 

 fairly long, as a rule with a couple of rings below. 



The gonothecse proceed from the hydrotheca stalks close under the polyp, and are attached 

 by a short, often almost quite rudimentary stalk, or are exceptionally formed as heterorenovates in the 

 hydrothecae. The males are elongated oval or narrowly egg-shaped, attached to the colony by their 

 narrower end. The female gonothecae are practically pear-shaped, laterally compressed, and with a 

 pair of hydranths in the distal, asymmetrically placed opening; on the side opposite this aperture, the 



60 



20 



200 m. 



boom. 



. ._._. .-IOOO m. 



Fig. XV. Finds of Halecium scutum in the Northern Atlantic, 

 o Localities of Halecium Beanfi after Kramp (1914), referring to Halecium scutum. 



gonotheca has 29 transverse furrows, more or less pronounced, at times almost imperceptible; they 

 never reach right round the gonotheca. 



"Ingolf" St. 29, 6534' N., 543i' W., depth 68 fathoms, 0,2 

 Greenland: Egedesminde (without further details) 

 Iceland: Bakkefjord, depth 10 fathoms 

 Hvalfjord, 46 metres. 



A detailed description of Halecium curvicaulc has been given by Dons (1912 p. 61) who shows, 

 that Halecium mirabile Schydlowsky and Halecium repens Jaderholm are synonyms to this species. 



