222 THE ROYAL SOCIETY OF CANADA 



Sertularella tricuspidata (Alder) 



Sertularia tricuspidata Alder, Ann. and Mag. Nat. Hist., 2nd ser., 



XVIM, 1856, p. 356. 

 Sertularella tricuspidata Fraser, West Coast Hydroids, 1911, p. 71. 



Several fragments of this ubiquitous form were present, — some 

 with gonangia. 



Family plumularidje 



Plumularia halecioides Alder 



Fig. 3. 



Plumularia halecioides Alder, Ann. and Mag. Nat. Hist., 3rd ser., Ill, 



1859, p. 353. 

 Plumularia halecioides Hincks, British Hydroid Zoophytes, 1868, 



p. 306. 



There was but one plumularian colony in the collection and it was 

 a young one. As it was not old enough to be branched or fascicled 

 it has not all the characteristics of a mature colony of P. halecioides, 

 but in other respects it answers the description of the species very well. 



The total length of the colony is less than 3 mm. and as it is un- 

 branched, it resembles a hydrocladium more than a complete colony. 

 The basal internode is without a nematophore and without a hy- 

 drotheca. Following this are three hydrothecate internodes, with 

 two intermediate internodes. The hydrothecate internodes, especially 

 the proximal one, are much longer than the intermediate. The 

 hydrotheca is situated near the distal end of the internode, is nearly 

 equal in breadth and height and is but slightly flaring if at all. There 

 is a nematophore near the proximal end of each hydrothecate internode 

 and two just above or beside the upper part of the hydrotheca and one 

 on each intermediate internode. There is no sign of interseptal 

 ridges. 



Note. — -A complete synonymy for each species as far as west 

 coast references are concerned as well as a Bibliography has been given 

 in the 1911 paper on "West Coast Hydroids" and it does not seem 

 necessary to repeat these here. 



