76 



HYDROIDA II 



Fig. XXXVII. Nematocarpiis ramuliferus. a basal part of a hydrocladimii showing the development of the secondary hydro- 



cladium \p primary, j secondary hydrocladium ; the proximal, sarcothecal branch is a little abnormally developed]. "Ingolf St. 



44. b internodium of the primarj- tube of the stem of a young colony from "Ingolf St. 98. c Hydrotheca, "Ingolf" St. 44. 



d Gonotheca in side view and front view, "Ingolf" St. 98. {a '/ 45, b — d x 90). 



the gonotheca itself. The aperture is round or often somewhat broader, oval, and we thus find here 

 a distinct approach to the remarkable form of gonotheca which occurs in all known forms of Aglao- 

 f^liDinpsis and Cladocarpns species, save that a distinct upper lip is less often clearly discernible. 



Xiinatocarpus rdiiinlifrrus was formerly only found in the cold area (fig. XXXVIII), but the 

 two finds fall just in the zone where otherwise warmer atlantic, deeper-living visitors occur sporadi- 



l-"ig. XXXX'IIl. I'inds of Xrmatocarpm raiinilifrnis. 



