[185] THE HYDROIDS 203 



Distribution. Yakutat, Alaska (Harriman Exped.) ; British Coast 

 (Ellis and Solander) ; Kara Sea (Bergh) ; New England Coast (Ver- 

 rill) ; Puget Sound (Nutting) j California (Clark). 



THUIARIA SIMILIS (Clark). 

 Sertularia similis CLARK, Proc. Acad. Nat. Sci. Phila., p. 219, 1876. 



Distribution. Berg Inlet, Glacier Bay, Alaska (Harriman Exped.) ; 

 Hagmeister Island, Alaska (Clark) ; Puget Sound (Nutting, MSS.). 



THUIARIA VARIABILIS (Clark). 

 Sertularia variabilis CLARK, Proc. Acad. Nat. Sci. Phila., p. 221, 1876. 



Distribution. Orca, Alaska (Harriman Exped.) ; numerous sta- 

 tions in Alaska (Clark) ; San Miguel Island, California (Clark) ; Puget 

 Sound (Nutting, MSS.). 



THUIARIA CUPRESSOIDES (Clark). 

 Sertularia cupressoides Clark, Proc. Acad. Nat. Sci. Phila., p. 220, 1876. 



Distribution. Yakutat, Alaska (Harriman Exped.) ; Shumagin 

 Islands and Port Moller, Alaska (Clark). 



THUIARIA COEI sp. nov. 

 (Plate xxvi, figs. 1-3.) 



Trophosome. Colony consisting of a single flexuous stem giving 

 forth regularly alternate branches. Stem three inches high, and divided 

 into irregular internodes each bearing a branch and two hydrothecae on 

 one side and one hydrotheca on the other. Branches divided into 

 irregular internodes, each usually bearing several pairs of hydrothecse. 

 Hydrothecas subopposite, turgid basally, narrowing distally to a hori- 

 zontal aperture which is pointed on its outer side. An upward pro- 

 jecting point of chitine at the bottom of each hydrotheca. 



Gonosome. Gonangia top-shaped, or obconical, with a pronounced 

 round collar and rather broad aperture. Proximal portion broadly cor- 

 rugated, and narrowing basally to a short curved pedicel. 



Distribution. Dutch Harbor, Alaska (W. R. Coe, Harriman 

 Exped.). 



This is a very distinct species, and the top-shaped gonangia are 

 quite different from any others of the genus that I have seen. 



THUIARIA FABRICII (Levinsen). 

 (Plate xxiv, figs. 4, 5.) 



Sertularia fabridi LEVINSEN, Meduser, Ctenophorer og Hydroider fra Gron- 

 lands Vestkyst, p. 48, 1893. CALKINS, Some Hydroida from Alaska and 

 Puget Sound, Proc. Boston Soc. Nat. Hist., Vol. xxvin, p. 361, 1899. 



