40 C. McLEAN FRASEE 



OBELIA SURCULARIS Calkins 



Obelia surcularis Calkins, Some Hydroids of Puget Sound. 1899, p. 355. 



Distribution. — Scow Bay, Port Townshend, Wash. (Calkins). 

 Genus THAUMANTIAS 



Trophosome. — Stem unbranched, arising from a much 

 branched stolon. 



Gonosome. — "Reproduction by free medusae. Umbrella hemi- 

 spheric ; manubrium 4-lipped ; radiating canals 4 ; marginal ten- 

 tacles numerous ; sporosacs in the course of the radiating canals ; 

 lithocysts wanting." (Hincks). 



THAUMANTIAS INCONSPICUA Forbes 

 Tliaumantias inconspicua Forbes, Monograph of the British Naked-eyed 



Medusa?, 1848, p. 52. 



Tliaumantias inconspicua Wright, Quarterly Jour. Micr. Sc, 1862, p. 221. 

 Campamdaria inconspicua Calkins, Some Hydroids of Puget Sound, 1899, 



p. 349. 



Distribution. — Puget Sound (Calkins) ; San Juan Archipelago. 



Dr. J. Strethill Wright, in experimenting with Thaumantias 

 inconspicua Forbes, managed -to grow some hydroids which he de- 

 scribes^^ but unfortunately does not figure. A form which cor- 

 responds perfectly to his description was found by Calkins in 

 Puget Sound, though he named it Campamdaria inconspicua. 

 I have found specimens from the San Juan Archipelago in both 

 Prof. Kincaid's and Mr. Moon's Collections. What serves to 

 substantiate the opinion that it is the same as that described by 

 Wright is that it has the medusa of the regular Thaumantias 

 type as is shown by Calkins' figure,^- quite different from that 

 found in other Campanularian forms. It has been considered 

 by some investigators to be synonymous with Campaniilaria rari- 

 dentata Hincks, but I have found several specimens of a species 

 which bears an exact resemblance to Hincks' figure^^ of this 

 species, very different indeed from Calkins' type, as can readily 

 be seen from the figures. 



CAMPANULINID^ 



Trophosome. — Colonies branched or unbranched ; hydrothecae 

 pedicellate or sessile, always operculate, the operculum being 



"Quarterly Jour. Micr. Sc, 1862, p. 221. 



12 Some Hydroids of Puget Sound, 1899, PI. 2, Fig. 8c. 



13 British Hydroid Zoophytes, PL XXVI, Figs. 2 and 2a. 



