PENNATULIDA DREDGED BY H.M.S, " TRITON." 137 



All the fragments belong to small and young specimens. Inasmuch as F. 

 quadrangularis is found at other parts of Loch Linnhe in great profusion and 

 of large size, specimens having been obtained up to 162 cm. in length, it 

 would appear that the locality from which the " Triton " specimens were 

 obtained is not one favourable to this species. 



The portion of rachis of one of the young specimens drawn in fig. 22 shows 

 some points of interest. In the first place, it will be noticed that the calcareous 

 spicules, which in F. quadrangularis are usually confined to the calyx, here 

 extend down the whole length of the polyps along the lines of attachment of 

 the septa. These spicules, which also occur in the rachis, though in smaller 

 numbers, have an average length of 1 "7 mm. The unusual abundance of these 

 spicules, and their presence in such young specimens, are points of interest. 



The middle polyp of the figure is shown in a condition of extreme contrac- 

 tion ; the tentacles being completely withdrawn within the calyx, the processes 

 of which meet one another so as to form an acutely pointed cone. This figure 

 agrees very closely with one given by Kolliker,* the accuracy of which has been 

 doubted, owing to the shape being so very unlike that of the expanded or half- 

 expanded polyp, and the apparently exaggerated length of the calyx processes. 



Fig. 22 shows also the gradual increase in size of the polyps in passing 

 from the dorsal (right-hand surface in the figure) to the lateral surface ; also 

 the entirely independent insertion of polyps and zooids — a primitive feature ; 

 and the total absence of distinction between the young polyps and the zooids ; 

 also the quadrangular shape of the stem. 



Sub-section 2. Junciformes. 



Family 1. Kophobelemnonidae. 

 Kophobelemnon, Asbjornsen. 



Kophobelemnon stelliferum var. durum (Koll.). (PL XXIV. figs. 23-28.) 



Thirty-three entire specimens of this species and seven heads (the upper 

 polyp-bearing part of the rachis) were obtained, one of these being from the 

 " Knight Errant " collection, the remainder from the " Triton " one. They 

 were dredged at four different localities, Stations 6, 8, 10, and 11, and at 

 depths varying from 516 to 640 fathoms. 



K. stelliferum was first found by 0. F. Muller in 1775, near Drobak, in the 

 Christianiafjord, and described by him in the Zoologia Danica, under the name 

 Pennatula stellifera. It has been dredged in various parts of the Christiania 

 fjord by Loven and by Asbjornsen, t the latter of whom obtained it in con- 



* Kollikee, op. tit, pi. xvii. fig. 153. 



f Asbjornsen, " Beskrivelse over Kophobelemnon Miilleri," Fauna littoralis Norvegice, Andet 

 Hefte, pp. 81-85, and Tab. 10, figs. 1-8, 1856. 



