HYDROIDA II 



93 



region of the warmer seas and the upper abyssal region; quite cxceptionalh- it may penetrate deeper 

 down, as seen from the above. In the Iwreal regions it is not altogether rare, and has even in a 

 singfle instance been met witli in the cold area. 



. _ looo m. 



Fig. L. The distribution of Thecocaipits myriophyllum in the northern Atlantic. 

 In the hatched regions the literature notes a common, although scattered occurrence. 



Gen. Aglaophenia Lamouroux. 



Upright pinnate colonies with branched or nnbranched main stem, the apophyses bearing un- 

 brauched hydrocladia with several hydrothecse. All sarcotheca; immobile. GonothecEe in a corbula 

 formed by a metamorphosed hydrocladium; the corbula blades (ribs) are furnished with sarcothecs, 

 but lack h\drothecse. 



Aglaophenia tubulifera Hincks. 



1861 Pliinnilaria tuhulifera, Hnicks, A catalogue of the Zoophytes of vSonth Devon, p. 256, pi. 7, 



figs. I — 2. 

 1868 Aglaophenia hibiilifera, Hincks, A history of the British Hydroid Zoophytes, p. 288, pi. 63, fig. 2. 



The colonies are pinnate with nnbranched or branched monosiphonic main stem divided into 

 short internodia. The internodium has dose below the middle an apophyse directed obliquely forward 

 and sideways, and three tubulose sarcotheca;, a pair at the upper side of the apophyse and an unpaired 



