HYDROIDA FEOM ALASKA AND PUGET SOUXD. 



By Charles Cleveland Nutting, 



Professor of Zooloyy, University of loira. 



The followiug notes are based on a small collection of liydroids from 

 the Pacific coast and St. Pauls Island, Alaska, sent to the writer by 

 Mr. Trevor Kincaid, of the University of AVashington. 



A considerable proportion of the material was collected by the 

 Young Naturalist's Society, in connection with the University of 

 Washington, which organized a dredging expedition in Puget Sound 

 in the summer of 1895. So far as the writer is informed, this is the 

 first dredging that has been done in those waters, and it has resulted 

 in a verj^ interesting series of new forms, as well as the extension of 

 the known range of a number of species. As might have been antici- 

 pated, the fauna of Puget Sound, beyond the littoral zone, is most 

 closely allied to that of more northern waters, a number of forms col- 

 lected in Alaska by Mr. W. 11. Ball' appearing in the material 

 secured by dredging in Puget Sound. 



The following table of distribution of the previously described spe- 

 cies contained in this collection 's\ ill at once show the subarctic nature 

 of the hydroid fauna of Puget Sound: 



Geographical diHlribution of Hydroids. 



1-?^ 5 



Names of specieis. 



S S ^ 



o ----~ ; 



Syncoryne mirahilii (Agassiz) (2) 



CaMpanvlaria circvla Clark (10) 



Obelia plicata Ilincks (16) 



f'alyeella nyrituja (Linna'us) 



Lafuea dumota Fleming 



Lafoi'afruticoKa Sars 



La/(jea yracillima (Alder) (3) 



Hahcivrn fialecinnm Linnieus 



Serlularia variabiliii Clark '^ (10) 



SerUdaria argentea Ellis and Solauder (13). 



Hertularia tenera Sa rs (25) 



iSertularella tficunpidata (Alder) (3; 



Si-rtularella rufjosa (Linnieiis) 



Thuiaiia yiyatitea Clark (10) 



Thniaria turgida Clark (10) 



SelaginojiHn rnirabilis ( Verrill) (28) 



Plumularia californica Marktanner (21) . .. 





&4 





u I 





+ + 



+ ! + 



4- 



NoTE. — The numbers in pareuthescfl have reference to the bibliograjdiy at the end of the paper. 



' Report on the Hydroids collected on the coast of Alaska and the Aleutian Islands, 

 Proc. Acad. Nat. Sci., Philadelphia, 1876. 



^Thianame is also used by 8. F. Clarke in connection with an entirely different 

 species. See Bull. Mus. Comp. Zool., XXV, No, (i, p. lo, pis. iv, v. 



Proceedings U. S. National Museum, Vol. XXI— No. 1 171. 



741 



