120 THE ROYAL SOCIETY OF CANADA 



Gonosome. — Gonophores bearing medusae that when liberated 

 have 2-4 marginal tentacles arranged singly and no ocelli. 



Perigonimus repens (Wright) 



PI. V, Fig. 11 



Eudendrium pusillum Wright, Proc. Royal Phys. Soc. Edin., 



1857, p. 231. 

 Atractylis repens Wright, Ibid., 1858, p. 450. 

 Perigonimus repens Allman, Ann. and Mag. Nat. Hist., 3rd ser., 



8, 1864, p. 365. 

 Perigonimus repens Calkins, Some Hydroids of Puget Sound, 



1899, p. 339. 

 Perigonimus repens Fraser, West Coast Hydroids, 1911, p. 24. 



Trophosome. — Colonies small; stems unbranched or slightly and 

 irregularly branched, arising from a reticulated hydrorhiza; perisarc 

 well developed but apparently fitting very loosely over the ccenosarc. 

 It is not expanded distally but is large enough that the hydranth may 

 be retracted well within it. Tentacles about 10 in number standing 

 out rather stiffly from the hydranth body. 



Gonosome.— Gonophores borne on pedicels growing from the 

 hydrorhiza or from the stem. In the latter case there may be one or 

 more present on the same stem. Medusae with two developed and two 

 rudimentary tentacles at time of liberation. 



Color. — White or grayish. 



Distribution. — Townshend Harbor (Calkins); Departure Bay 

 (Fraser); off Lasqueti I., off N. end of Gabriola I., Northumberland 

 Channel. 



The specimens obtained off Gabriola Island in 25 fathoms were 

 much more robust than any others I have seen, but apart from the 

 difference in size there was nothing to indicate that they belonged to a 

 different species. The smaller specimens found in the other localities 

 resemble those hitherto reported from this region. 



Family Eudendridae 



Trophosome. — Colony branching; perisarc well developed; pro- 

 boscis trumpet-shaped but with much freedom of movement; tent- 

 acles all filiform in a single whorl. 



Gonosome. — Gonophores producing fixed sporosacs; male and 

 female gonophores usually dissimilar, male gonophores in whorls, 

 female in clusters. 



Genus EUDENDRIUM 



The only genus of the family Eudendridœ. 



