[fraser] HYDROIDS OF THE VANCOUVER ISLAND REGION 109 



Gonosome. — Gonophores giving rise to free medusa' with simple 

 radial canals and simple marginal tentacles. 



Genus ENDOCRYPTA 



Trophosome. — Hydrorhiza of small fibres or almost entirely 

 degenerated. The perisarc which envelopes the hydrocaulus also 

 unites one with the others, this being in the nature of a very fine 

 encrustation. Hydranths claviform. 



Gonosome. — Gonophores producing free medusae with four 

 radial canals and four simple marginal tentacles. 



Endocrypta huntsmani (Fraser) 

 PI. I, Fig. 1. 



Crypta huntsmani Fraser, West Coast Hydroids, 1911, p. 19. 

 Endocrypta huntsmani FRASER, Science, vol. XXXV, 1912, 

 p. 216. 



Endocrypta huntsmani Fraser, Hydroids from Vancouver 

 Island, 1913, p. 149. 



Trophosome. — Hydrocaulus tubular, in most cases erect and 

 unbranched, but occasionally it branches or more correctly forks 

 as the two parts seem to be of equal significance and seldom differ 

 much in size. The two parts of the fork may remain in an upright 

 position forming a very acute angle, or one or both may turn very 

 much from the perpendicular and the one may turn from the other 

 until they get in exactly opposite directions. The erect hydrocaulus 

 may reach a height of 8 mm. The perisarc is so thin as to be a mere 

 pellicle, that part which form? the basal expansion being particularly 

 so. In the young colony the hydrorhiza consists of a network of 

 fine fibres, but these appear to degenerate in the older forms so that 

 when a single individual is separated from the colony it pulls out 

 like a fungus with a portion of the mycelium attached. The hydranth 

 appears much darker than the hydrocaulus. When at rest it is 

 usually club-shaped but it has extreme mobility. The mouth may 

 be opened so that the proboscis is trumpet-shaped or it may be averted 

 and reflexed entirely so that it is folded back over the base of the 

 tentacles, these also being turned backward to point towards the 

 base. In such a case the extremity is shaped like a strawberry 

 with the tentacles projecting like the calyx-teeth and the bases showing 

 through the wall like the seeds on the receptacle. In some cases the 

 tentacles appear to be arranged in fairly definite rows but more 



