PROCEEDINQS 



OF THE 



WASHINGTON ACADEMY OF SCIENCES 



Vol. Ill, pp. 235-266. PLS. xxvii-xxx July 13, 1901. 



PAPERS FROM THE HARRIMAN ALASKA 

 EXPEDITION. 



XXIII. 



THE ASCIDIANS. 



By Wm. E. Ritter. 

 University of California. 



In view of the wealth of the Ascidian fauna of the Pacific 

 Coast from Puget Sound southward, and of the number of 

 specimens received in chance collections from Alaskan waters, it 

 was something of a surprise that these animals were not found 

 in greater abundance at the points visited by the Harriman Ex- 

 pedition. The most diligent search was made in localities 

 where the conditions appear to be as favorable as at places on 

 the California Coast where they flourish in great luxuriance, 

 both as to number of species and of individuals, and yet only 

 the fifteen species embodied in this report were secured, and 

 the number of individuals of each species was usually small. 



The localities at which Ascidians were obtained and the 

 species from each locality are as follows : 



Sitka. — Alolgula graphica ; Psain7naplidiitm peduticulaUnn. 



Glacier Bay. — Ascidia adhcereiis. 



Yakutat Bay. — Ascidia adhce?-e?ts ; Cyjitkia villosa ; Styela yaku- 

 tatensis ; S.truncata; Distoma ptclchra. 



Prince William Sound. — Rhizoinolgida arenaria ; A?naroticium 

 t ra nslu cidu m . 



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