8o 



PENNATULIDA. 



polyp-bearing rhachis-club. The whole stalk is covered with zooids, downward to the upper part of 

 the lower swelling, where the cessation of the zooids shows the boundar)- to the peduncle. Of the 

 zooids of the stalk, those of the upper swelling are almost always provided with a tentacle like those 

 of the rhachis-club; but also farther down the stalk, for instance in the thinnest part of it, the zooids 

 may be provided with a tentacle, but it is then a very thin one; most likely all zooids have this 

 equipment, but the thin tentacles are easily torn off, and this I take to be the reason why it seems 

 to be wanting in most of the zooids of the stalk. The upper part of the stalk, below the rhachis-club, 

 is twisted and bent in various ways, but always in such a manner that the cluster remains pendent; 

 further the whole stalk, above the lower swelling, is turned like a spiral round its longitudinal axis. 

 The calcareous axis is quadrangular with deeph- concave surfaces and rounded edges. Very small 

 spicules are found, but only in the lower end of the peduncle. The colony grows to a 

 height of more than two metres. 



Of this species the f.Ingolf brought home five specimens (the Nrs. 2, 3, 5, 6, and 7 of the table 

 below), and later the Amdrup— Hartz Expedition has brought three more specimens (Nrs. i, 4, and 8), 

 Cand. Jensen from the cruise of the « Mich. Sars , two specimens (Nrs. 9 and 11), and the steamer «Thor , 

 one (Nr. 10). The particulars with regard to these specimens are given in the table below, which shows 

 that onlv six specimens have kept the stalk entire, or kept it so far, that it has been possible to 

 measure its length (Nr.s. 4 and 10 are broken and parts of the calcareous axis wanting), and that two 

 of these six are young stages; the specimens Nrs. 8 and 11 are torn off clusters and in a very bad 

 condition, and therefore some of the measurements given are rather uncertain. I think that the spec- 

 imen Xr. 3 is the longest one hitherto measured. 



Nr. 

 Localit}- 



Length of the stalk ... in mm. 



Lengtli of the l)iill)ou.s part 



in mm. 



Diameter of the lower end of 



tlie peduncle in mm. 



Diameter of the swelling above 



the peduncle in mm. 



Diameter of the tliinnest part 



of the stalk in mm. 



Length of the sheath-formed 



dilation in mm. 



Length of the cluster . in mm. 

 Length of the rhachi.s-clul) 

 in mm. 

 Breadth of the rhachis-club 

 in mm. 

 Numl)er of polyps 



in the lower 

 circle 



Cape 

 Brewster 



St 105 St. 1 16 



148 



0-5 



10 



17 



215 



40 



2-5 



3 



0.5 



9 

 23 



Canning 

 Land 



2-5-3 I 3-5 



4(4-1) ' 7(-^4l 



2350 

 312 



17 

 i3 



3 



150 



1090 



20 



24 



5-6 



c, 100 

 170 



5- 

 St. 116 



6. 



St. 116 



7- 

 St. 116 



Canning 

 Land 



:M. Sars» 

 St.34a 



125 



105 



1090 

 230 



17 



18 



<-Thor« 

 St. 51 



1410 

 290 



17 



«M. Sars . 

 St. 34 



c. 90-92 



21 

 25 



') .Several small polyps, but none still in the rudimentary stage. 



