208 THE ROYAL SOCIETY OF CANADA 



into alternate non-hydrothecate and hydrothecate internodes, the 

 proximal being non-hydrothecate; it is shorter than the intermediate 

 internodes and has but one septal ridge, while each of the others have 

 two. In each internode which bears a hydrotheca there are usually 

 three ridges well marked, one at each end and one at the base of the 

 hydrotheca ; the hydrotheca is much nearer the distal than the proximal 

 end of the internode, its depth and breadth are nearly equal; in most 

 cases the internode is swollen below the hydrotheca. There are two 

 supracalycine nematophores, a mesial one on each hydrocladial 

 internode with exception of the first, one on each cauline internode 

 on the side opposite the hydrocladial process and two in the axil of 

 each process. 



Gonosome. — Gonangia borne on the hydrocladial processes of 

 the cauline internodes; in the one diameter the gonangium is oval, 

 with a distinct neck, which is sometimes slightly curved and a terminal 

 opening, the proximal end is tapered to form a short pedicel; in the 

 other diameter it is much flattened so that looking at it edgeways it 

 looks not unlike the gonangium of P. setacea. 



Distribution. — Puget Sound (Dr. Steindachner) ; Vancouver Island 

 (Allman) ; Victoria (Nutting) ; San Juan Archipelago, Port Renfrew, 

 Ucluelet, Dodds Narrows, Hope I. (Fraser); Amphitrite Point, 

 Swiftsure Shoal, off Massett, Northumberland Channel, Cabriola 

 Pass. 



In my previous paper I mentioned the resemblance between 

 P. palmeri and P. lagenifera. Since then much additional material 

 has been obtained and I can see no reason for regarding them as dis- 

 tinct species. Nutting gives as the distinction between the two that 

 P. lagenifera may be branched and has hydrothecae wider than deep, 

 while P. palmeri is not branched and the hydrothecae are not wider 

 than deep. With regard to the branching it is not very satisfactory 

 to judge, that because colonies from one collection in one locality 

 are branched or otherwise, they are always so. Very few specimens 

 that I have seen, even those which are undoubtedly P. lagenifera, 

 have any sign of branches. That the relative depth and breadth of 

 the hydrothecae cannot be depended upon is shown by the fact that 

 the hydrotheca of P. lagenifera shown in fig. 10, pi. VI, is deeper 

 than wide, while the upper one of P. palmeri in fig. 4 of the same plate, 

 is wider than deep, and these drawings were made from camera lucida 

 sketches. One other point is mentioned, viz., that the septa at the 

 base of the hydrotheca in P. palmeri are fainter than in P. lagenifera. 

 When the septa are present in both cases, the degree of faintness can 

 scarcely be considered as a good specific character, particularly so, 

 although there may be this distinction throughout a whole colony, 



