136 THE ROYAL SOCIETY OF CANADA 



THUIARIA GENICULATA new name 



Thuiaria distans fraser, Hydroids of Vancouver Island region, 1914 

 p. 197. 



The fact that the name Thuiaria distans was used by Allman in 

 describing a new species from the Gulf Stream in 1877 was overlooked 

 when the 1914 paper was prepared. As "distans'' was preoccupied, 

 "geniculata' is now given to replace it, as in this species both the 

 stem and the branches are geniculate. 



PLUMULARIA PLUM ULAROI DES (Clark) 



Fig. 5 



Haleciiim pliimularoides clark, Alaskan Hydroids, 1876, p. 217. 

 Plumularia plumularoides nutting. Am. Hydroids, Pt. I, 1900, p. 62. 

 Plumularia plumularoides torrey, Hyd. of the Pacific Coast, 1902, 



p. 78. 

 Plumularia plumularoides fraser. West Coast Hydroids, 1911, p. 84. 



Trophosome. — Colonies growing together in bunches, reaching a 

 height of 30 mm.; stem simple, divided into regular internodes by 

 well marked nodes, each bearing a single hydrocladium on a prominent 

 process near the distal end, the hydrocladia alternating from side to 

 side but in the same plane. The first hydrocladial internode is short 

 and does not bear a hydrotheca, but all the other internodes, as many 

 as five, are hydrothecate, each bearing one hydrotheca; hydrotheca 

 nearly equal in length and breadth; septal ridges absent; two supra- 

 calycine nematophores, one mesial nematophore on each hydrocladial 

 internode and one or two at the axil of the hydrocladium on the 

 cauline internodal process; all monothalamic. 



Gonosome. — Gonangia attached either to the process that sup- 

 ports the hydrocladium or to the hydrothecate internodes, just lateral 

 to the hydrothecae; similar in size and shape to those of P. lagenifera, 

 oval, but greater in one transverse diameter than in the other, narrow- 

 ing to a small process of attachment proximally and extending into a 

 bottle neck with a small circular opening, distally. The male and the 

 female gonangia are similar in size and shape; the male blastostyle 

 has a pair of processes near its centre, projecting outward and slightly 

 backward. 



Distribution. —On Macrdcystis near the south shore of Hope 

 island, west of the entrance to Bull harbor. 



The published descriptions of this species have been so meagre 

 that, as I have previously mentioned, it was impossible to distinguish 



