64 C. McLEAN PKASEE 



Genus DIPHASIA 



DIPHASIA CLAK^, new species 

 PI. VI, Pig. 1 



Tropliosome. — The colony is small and delicate, not half an 

 inch in length, parasitic on Ahietinaria oMetina and other coarse 

 forms. It is dichotomously branched, with a hydrotheca in the 

 angle in each case. A quite regular division into internodes 

 takes place, with rarely more than* one hydrotheca to an inter- 

 node. The hydrotheca are alternately arranged, the two in suc- 

 cession being quite distant from each other. Each has the regu- 

 lar Diphasia form, with but a slight narrowing from the base to 

 the aperture. The margin of the aperture is also typical, being 

 shaped like the rim of a pitcher, with the adcauline operculum 

 of a single flap, shaped to fit. The hydrotheca is less than half 

 immersed. 



Gonosome. — Unknown. 



Distribution. — On Ahietinaria ahietina and other large hy- 

 droid colonies, San Juan Archipelago ; Queen Charlotte Islands. 



DIPHASIA COENICULATA (Murray) 



Sertularia corniculata Murray, Ann. and Mag., 3rcl Ser., Y, 1860, p. 251. 

 Sertularia corniculata Clark, Hydroids of the Pacific Coast, 1876, p. 251. 

 DiiJhasia corniculata Nutting, American Hydroids, Part II, 1904, p. 112. 



Distribution. — Bay of San Francisco (Murray). 

 DIPHASIA KINCAIDI (Nutting) 



Thuiara elegans Nutting, Hydroids of the Harriman Ex., 1901, p. 187. 

 Thitiaria Mncaidi Nutting, American Naturalist, Sept., 1901, p. 789. 

 Thiiiaria elegans Torrey, Hydroida of the Pacific Coast, 1902, p. 14. 

 Bipliasia lincaidi Nutting, American Hydroids, Part II, 1904, p. 112. 



Distribution. — Berg Inlet and Dutch Harbor, Alaska (Nut- 

 ting). 



? DIPHASIA PULCHEA Nutting 



Diphasia piilchra Nutting, American Hydroids, Part II, 1904, p. 111. 



Distribution.— A\\)?dvo^H Station 2863, N. 48° 58', W. 123° 10', 

 67 fathoms (Nutting). 



I have seen no specimens of this species except Prof. Nutting's 

 types, and no description except the one that he gives, conse- 

 quently, I can only place it in this genus provisionally, as he has 

 done. 



