88 



HYDROIDA II 



is an indication of four to five faint inner ribs in the internodiiun at the hydrotheca; the proximal 

 sarcotheca is bounded on the lower side by a strong rib. 



The gonothecie are situated on dichotomically branched phylactogonia proceeding from the 

 basal internodium of the hydrocladia beside its proximal sarcotheca. The phylactogonia have three 

 branches, which bear, on the side turned towards the stem, a row of sarcothecse, and can be indistinctly 

 segmented. The gonotheca is somewhat flattened; seen from the broader side it is a broad oval, or 

 egg-shaped, fastened by the pointed end to the phylactogonium. The opening is broad, subterminal, 

 and turned downwards owing to the fact that the abcladial side curves far out beyond the opening 

 as a broad upper lip. 



FiK- XLVII. CladocarpHS Diana. "lugolf' St. 78. — a Phylactogonium with gonotheca (X 40). 

 h Hylrotheca in side view (X 6o)- — <: Hydrotheca in front view (X M. 



Material : 



"Ingolf" vSt. 46, 6i°32' N., ii°36' W., depth 720 fathoms 2,4° 

 - - 78, 6o°37' N., 27°52' W., - 799 - 4,5° 



Cladocarpus Diana has much stronger hydrotheca! teeth (fig. XLVII) than most other species 

 of the genus; nearest in this respect is Cladocarpus compressjts Fewkes, but the teeth there are some- 

 what broader; in addition, the intervals between the teeth in Cladocarpus Diana are curved somewhat 

 outwards. The most remarkable character, however, lies in the proximal sarcotheca. Seen from the 

 side, this does not differ greatly from other previously known species, being onh- unusually short, so 

 that the opening margin does not extend much beyond the bottom of the hydrotheca. But on exam- 

 ining the sarcotheca from the ventral side (fig. XLVII c] we find that it has its greatest breadth at 

 the opening margin, which may even be slightly longer than the breadth of the lower and middle 

 part of the hydrotheca. The sarcotheca has only one opening, which is correspondingly larger, the 

 free wall turning towards the hydrotheca being entirely effaced. 



