HYDROIDA II 



conical, broadly rounded distally, with a broad opening towards the phylactogonium ; in lateral view, 

 the abcladial wall is seen to dome out in a large upper lip over the opening, which is consequently 

 turned downwards towards the base. 



Material: 



"Ingolf" St. 51 64i5' N., i422' W., depth 68 fathoms 7,32 

 - 98 6 5 3 8' N., 2 627' W, 138 5,9 



Of this highly peculiar species, a couple of well developed colonies have been found; it re- 

 sembles somewhat Cladocarpus paradiseus Allman, with its two strong abcladial teeth, but these are 



Fig. XLVIII. Cladocarpus bicuspis from "Ingolf St. 98. 



a Basal part of a hydrocladium with its phylactogonium (X 40). 



b Side view of a hydrotheca (X 60). c Front view of a hydrotheca (X 60). 



more strongly developed in Cladocarpus bicuspis (fig. XLVIII) than in the species mentioned, and 

 their appearance is the more striking from their marked incurvation, which renders the median sinus 

 more prominent. The strong S-shaped septum is suggestive of Cladocarpus sigma Allmann; on the 

 other hand, the inner longitudinal abcladial keel seems to be without parallel in the genus. 



The phylactogonia are dichotomically branched, the ramification does not always take place 

 once only, as in the one shown (fig. XLVIII ), but as a rule two or three times, so that we have 

 three or four terminal branches. The gonothecse shown by G. O. Sars (1874 pi. 2, fig. 8) are not yet 

 fully grown. The full-grown gonotheca presents the same typical appearance as the remaining north- 

 ern Cladocarpus species, with a much more strongly developed upper lip domed out over the open- 

 ing; it is here as strongly developed as in Cladocarpus Diana. 



Cladocarpus bicuspis is altogether a rare species in the regions investigated (fig. XLIX) and as 

 it does not seem to have been found at all elsewhere, its true habitat is still a matter of doubt. In 

 the northern waters, the species belongs to the typical visitors from the warmer atlantic waters, 

 being previously known only from between Stavanger and Trondhjem Fjord on the west coast of 



