l86 NUTTING 



Distribution. — Dutch Harbor, Alaska (Harriman Exped.) ; Green- 

 land (Levinsen) ; Puget Sound (Calkins). 



A specimen in the Harriman collection agrees perfectly with the 

 descriptions and figures of both Levinsen and Calkins. I have directly 

 compared it with specimens of Serttdaria argentea from England, 

 and find that the two species are evidently distinct, T. fabricii differ- 

 ing from 6". argentea in the following particulars. The colony is much 

 more bushy in appearance, and more compactly branched. The hydro- 

 thecas are more nearly in pairs, and much inore closely approximated, 

 are more densely corneous and have a more delicate and less clearly 

 defined aperture. The gonangia are considerably larger and of thinner 

 texture, and are only occasionally armed with lateral spines. 



It should be explained that Levinsen regards his Sertularia fabricii 

 as identical with the Serttilaria argentea of authors, and gives it the 

 name S. fabricii. My opinion is that the species is distinct, and I 

 recognize the name given by him because he has correctly described 

 and figured the species, although not classing it as distinct. It should, 

 however, be placed in the genus Thuiaria^ for it comes well within 

 that genus as here defined. 



THUIARIA TURGIDA Clark. 



(Plate XXV, figs. 4-6.) 



Thuiaria turgida Clark, Proc. Acad. Nat. Sci. Phila., p. 229, 1876. — Nut- 

 ting, Hydroida from Alaska and Puget Sound, Proc. U. S. Nat. Mus., 

 Vol. XXI, p. 741, 1899. 



Distributio7t. — Sitka, Orca, Popof Island, and Dutch Harbor, 

 Alaska (Harriman Exped.) ; Port Etches, Shumagin Islands, Semidi 

 Islands, and many other points in Alaska (Clark). 



THUIARIA GIGANTEA Clark. 



Thuiaria gigantea Clark, Proc. Acad. Nat. Sci. Phila., p. 230, 1876 — Nut- 

 ting, Hydroida from Alaska and Puget Sound, Proc. U. S. Nat. Mus., 

 Vol. XXI, p. 741, 1899. 



Distribution. — Kadiak and Popof Island, Alaska (Harriman 

 Exped.) ; St. Paul Island, Hagmeister Island, Unalaska and Kiska 

 Harbor, Alaska (Clark) ; St. Paul Island (Nutting). 



THUIARIA THUIARIOIDES (Clark). 

 Sertularia thidarioides Clark, Proc. Acad. Nat. Sci. Phila., p. 223, 1876. 



Distribution. — Yakutat, Alaska (Harriman Exped.) ; Nunivak 

 Island and Chignik Bay, Alaska (Clark). 



