142 THE ROYAL SOCIETY OF CANADA 



b. Hydrotheca smooth 



1 . Hydrotheca small with 7 teeth C. inconspicua 



2. Hydrotheca with 10-12 teeth 



i. Gonangium smooth C. cylindrica 



ii. Gonangium corrugated C. johnstoni 



Clytia attenuata (Calkins) 

 PI. XIII, Fig. 39 



Campanularia attenuata Calkins, Some Hydroids of Puget Sound, 



1899, p. 350. 

 Clytia attenuata Fraser, West Coast Hydroids, 1911, p. 34. 



Trophosome. — "Stem fiexuous, very long, branches given off at 

 short intervals from a creeping stolon, 10-16 rings given off at base and 

 above point of branching. The parent stem is not ringed above the 

 branches. With from 2-7 or 8 well marked rings below hydrotheca, 

 but often reduced in diameter as it approaches the base of the hydro- 

 theca. The branches are given off at long intervals and are bent directly 

 upwards, parallel with the parent stem. The hydrothecae are large 

 with 9 or 10 rounded teeth on the margin and have a slight taper from 

 margin to base". (Calkins). 



Gonosome. — "Gonotheca large, borne on short, ringed stalk on 

 the parent stem just above the axils of the branches; smooth, oval, and 

 with a terminal aperture. The blastostyle as a rule bears three 

 medusae, the oldest of which are provided with a well marked manu- 

 brium and four tentacles; the diaphragm is a simple partition with 

 down-turned edge at the aperture. The hydranth is limited by an 

 annular ridge which, however, is not so pronounced as in the pre- 

 ceding species (Campanularia inconspicua), being more of a swelling. 

 Ccenosarc very much attenuated in basal chamber, becoming grad- 

 ually thicker as it approaches the stem. The basal chamber is a part 

 of the stem". (Calkins). 



Distribution. — Port Townsend, Scow Bay. (Calkins). 



I have no specimens of this species. The description and figures 

 are taken from Calkins. In its habitus it is very much like Clytia 

 edwardsi and Gonothyrœa gracilis but it is a more delicate species. 



Clytia cylindrica Agassiz 



PI. XIII, Fig. 40 



Clytia cylindrica Agassiz, Cont. Nat. Hist., U.S., IV, 1862, p. 306. 

 Clytia cylindrica Nutting, Hydroids of Woods Hole, 1901, p. 342. 

 Clytia cylindrica Fraser, Hydroids of Beaufort, 1912, p. 358. 



Trophosome. — Stem unbranched; the slender pedicel is annulated 



