HYDROIDA II 



Lafoeina maxima Levinsen. 

 1893 Lafoeina maxima, Levinsen, Meduser, Ctenophorer og Hydroider, p. 182, tab. IV, figs. 912. 



The colonies form upright, robust rhizocaulomes, often combined with creeping parts, which 

 spread out in plates over the underlayer. The closely set hydrothecse are cylindrical, somewhat irregul- 

 arly bent, with their outer portion nearly perpendicular to the branch axis. The hydrotheca has a 

 conically closing distal portion, exhibiting no distinct limitation from the remaining part of the same. 

 Between the hydrothecae are the nematothecse, which are very numerous, and closely packed; they 

 are slender, cylindrical, somewhat irregularly curved, with a distal, laterally situated oval aperture, in 

 which are some few large nematocysts. 



The gonothecse are wedged in between the nematothecse and the hydrothecse; they differ neither 

 in form nor in size from the hydrothecse, and their nature can thus as a rule only be determined from 

 section preparations. 



Material : 



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

 - 34 6 5 i 7 ' N., 54 i7' W.; 55 



Holstensborg Harbour 30 



Greenland : Egedesminde (without further details) 



Store Hellefiskebanke, depth 24 fathoms 



. . ,. TT , . . 1/evinsen'i 



north of Holstensborg ( ) 



type- 

 specimens 



Holstensborg ( ) 



Godthaab, depth 6070 fathoms 

 Davis Strait 100 



Iceland: Hriitafjord, depth 45 metres. 



Lafoeina maxima is a typical arctic species, belonging to the upper half of the littoral region 

 (fig. IX). The most southerly records of its occurrence are from Godthaab in Greenland, and Hriita- 

 fjord in Iceland; in the Norwegian waters it has hitherto only been met with in Ramfjorden, near 

 Tromso (about 6g3o' N.) 



Gen. Campanulina van Beneden. 







Colonies with sympodial growth and stalked, radially symmetrical hydrothecae. The closing 

 apparatus of the hydrotheca is formed by the distal folding portion of the hydrotheca wall, and goes 

 over into the same without sharp limitation. When folded down, the closing apparatus covers the 

 hydrotheca with a conical lid. The gonothecse differ in appearance from the hydrothecae. 



Kramp, in his exposition (1911 p. 383) merely draws attention to the stalked hydrothecse of 

 the genus as opposed to the sessile in Cuspidella and Lafoeina. Further, secondary characters are, it 

 would seem, here also to be found in the growth types of the colony, whether stolonial or sympodial. 



