HJALMAR BROCH. 



[REP. OF THE "MICHAEL SARS" NORTH 



small variations found in Aglaophenia elongata are also 

 observed in the present colonies, but the marginal teeth 

 of the hydrothecae are a little more prominent. The 

 marginal teeth in some specimens show a tendency to 

 break up into two, thus corresponding to the description 

 of Aglaophenia helerodonta Jaderholm l ) which is no doubt 

 identical with the present species, and will most likely 

 have to be united with Aglaophenia elongata. The 

 distinguishing character of Aglaophenia heterodonta, viz. 

 the alternate direction of the marginal teeth inwards and 

 outwards in relation to the opening of the hydrotheca. 

 is in somewhat larger colonies subject to such variations 

 that it cannot be acknowledged as a specific character of 

 importance. 



Aglaophenia late-carinata Allman. 



Sargasso sea (Stat. 64) abundant with gonangia on 

 floating sea-weed. 



The arrangement and the dimensions of the cauline 

 nematothecae in Aglaophenia late-carinata completely 

 agree with Aglaophenia pluma (Lin.) from the Adriatic. 2 ) 



Fertile colonies of Aglaophenia late-carinata were 

 apparently hitherto unknown, and the description will 

 accordingly be given from corbulae found in the "Michael 



Fig. 7. Corbula of Aglaophenia late-carinata from Stat. 64. 

 ( 40). 



Sars" material which seem to be rather aberrant from 

 corbulae previously described (see fig. 7). There is only 

 a single hydrotheca between the corbula and the stem. 

 The most striking feature of the corbula in Aglaophenia 



late-carinata is the prolongation of the outer, or in excep- 

 tional cases, of the next pair of leaves. The prolonged 

 leaf is generally curved round the anterior edge of the 

 corbula, and its free distal end often reaches down the 

 opposite side of the corbula to the posterior edge, the 

 entire leaf thus forming almost a complete circle. Now 

 and again we find the leaf curved in such a way as to 

 lie altogether on one side of the median plane of the 

 corbula. 



Aglaophenia septifera nov. nom (= Aglaophenia Kirchenpaueri 

 Marktanner — Turneretscher 1890, nee Heller \i 



Near Cape Bojador (Stat. 37) in 39 metres a few sterile 

 colonies. 



The dentition of the thecal margin very closely agrees 

 with that of Aglaophenia elongata Meneghini, but the 

 anterior pair of teeth generally far exceed the small mesial 



a , b 



Fig. 8. Aglaophenia septifera from Stat. 37. a: hydrotheca; 

 b: portion of the stem showing the arrangement of the nema- 

 tothecae on the internodium. (;< 60). 



tooth in size, and are also larger than all the other mar- 

 ginal ones. Nevertheless the species is easily recognised 

 on account of the anterior intrathecal septum, which extends 

 like a roof, about half as high as the hydrotheca, covering 

 more than the abcauline (anterior) half of its lumen (fig. 

 8, a). The arrangement of the cauline nematothecae 

 (fig. 8, b) resembles that in the species of the pluma-gwup. 

 The present specimens doubtless agree wilh the Aglao- 

 phenia Kirchenpaueri of Marktanner-Turneretscher. 3 ) 

 The specific name was already used in 1868 by Heller 4 ) 

 for a species which is rather difficult to identify, but 

 apparently identical with Aglaophenia pluma (Lin.); thus 



') Aussereuropaische Hydroiden im schwedischen Reichsmusemn (Arkiv for Zoologi, Bd. 1) Stockholm 1903, p. 296, taf. 13, figs. 

 10—12, taf. 14, fig. 1. 



2 j Hydroiduntersuchungen III, p. 32. 



'■) Die Hydroiden des k. k. naturhistorischen Hofmuseums. (Annalen des k. k. naturhist. Hofmus. Bd. V) Wien 1890, p. 263, 

 taf. VII, figs. 9 and 22. 



*) Die Zoophyten und Echinodermen des adriatischen Meeres. Wien 1868, p. 40, taf. II, fig. 4. 



