WEST COAST HYDEOIES 41 



formed of converging segments. Hydrantlis with a conical pro- 

 Tjoscis. 



Gonosome. — Gonophores producing plannlte or free medusae. 



Genus CALYCELLA 



TropJiosome.— Stem, a creeping rootstock; hydrothecse tubular, 

 borne on ringed pedicels. A distinct margin appears where the 

 segmented operculum joins the hydrotheca proper. 



Gonosome. — Gonangia oval, borne on the rootstock, producing 

 acrocysts. 



CALYCELLA PYGM.EA Ilincks 



PI. Ill, Fig. .5 



Lafaa pygmaa HixcKS. British Hydroicl Zoophytes. 1868. p. 20.5. 

 CalyceUa pygmaa Hixcks, Ann. and Mag. X. H., 4th Ser. 13, 1874, p. 149. 

 Calycella syringa Clark, Alaskan Hvdroicls, 1876, p. 217. 

 CalyceUa syringa Calkins, Some Hydroids of Puget Sound, 1899, p. 3.58. 



Distrihufion. — Coal Harbor, Shumagin Islands, Alaska 

 (Clark) ; Port Townshend (Calkins) ; Departure Bay, Dodd's 

 Narrows, San Juan Archipelago. 



Hincks ascribed this species to Alder, but as Alder described 

 it only in manuscript, he can scarcely be credited with it. There 

 seems to be much confusion in relation to this species. Hincks 

 in his first description places it with Lafejea, but mentions the evi- 

 dence of an operculum. Later he figures what he considers to be 

 the same species under the name CalyceUa pygmaa, showing a 

 distinct segmented operculum. Since that time some authors 

 have found the operculate form and retained the name CalyceUa 

 pygmaa, while others have found non-operculate forms similar 

 in shape which they have either called Lafosa pygmeia or have 

 substituted the generic name HeheUa instituted by Allmau.^* 

 though in this genus one of the characters is the presence of a 

 septum, separating the hydrothecal cavity from the cavity of the 

 pedicel. In colonies of CalyceUa pygmaa one often comes across 

 individuals in which the operculum has disappeared, so that the 

 rim of the hydrotheca looks that of a Lafoea and it is just pos- 

 sible that specimens supposed to be Lafoea pygmeea are such as 

 these. If the hydrothecal partition or septum has really been 

 seen in specimens of such a form it would be a good indication 

 that a HeheUa has been found. It would be a hard matter to de- 



1* Challenger Hydroids Part II, 1SS3. p. 29. 



