[Annals N. Y., Acad. Sci., Vol. XII., No. 14, pp. 589 to 616, May 26, 1900.] 

 [Zoology of Puget Sound, Columbia University Contributions No. 12.] 



SOME ASCIDIANS FROM PUGET SOUND, COLLEC- 

 TIONS OF 1896. 



Wm. E. Ritter. 



(Read November 14, 1898.) 



[Plates XVIII. -XX.] 



The collection of Ascidians made by the Zoological Expedi- 

 tion of Columbia University to Puget Sound during the summer 

 of 1896, and placed in my hands for study, contains, according 

 to the determinations that I am now able to make, fifteen 

 species, seven of which are new to science. 



Dr. Bashford Dean, who collected the Ascidians, did so with 

 the design of describing the new species himself, and to this 

 end made colored figures from life of several of the species. 

 Upon learning that I was, and had been for some years, en- 

 gaged upon the preparation of a monograph of the Tunicata of 

 the Pacific coast ol North America, he very willingly and 

 kindly turned over to me not only his material, but also his fig- 

 ures. Hence it is that I am able to report on this interesting, 

 though small, and in the case of some of the forms, quite de- 

 fective, collection ; hence it is, also, that I am able to enrich 

 several of the descriptions by excellent colored figures from 

 life. 



I wish to acknowledge here my obHgation to one of my 

 students. Miss Edith Byxbee for the excellent and extended 

 aid she has given me in this research. The greater part 

 of the work on the simple Ascidians is hers. 



(589) 



