NO. 1989. ASCIDIANS FROM NORTHEASTERN PACIFIC— RITTER. 487 



statement that columhianum also differs somewhat from productum 

 in size, shape, and position of orifices. On the whole, too, the num- 

 ber of tentacles seems to be greater in productum. 



About two dozen specimens, Albatross 2876, lat. 48° 33' N.; long. 

 124° 53', off Cape Flattery, Washington, 59 fathoms, bk. s. Septem- 

 ber 25, 1888. 



One specimen, Albatross 2866, lat. 48° 09' N.; long. 125° 03' W., 

 171 fathoms, gy.s., September 20, 1888. 



These two stations are near the entrance to the Strait of Juan de 

 Fuca. 



Half dozen specimens, no label, probably from same locality. 



CHELYOSOMA PRODUCTUM Stlmpson 



Chelyosoma producta Stimpson, 18G4, p. 161. 



Chehjosoma productum v. Drasche, 1884, p. 381, pi. 7, figs. 5-9. — Bancroft, 

 1898, pp. 309-332, pi. 18, figs. 1-14.— Hartmeyer, 1909a, p. 1392.— Hunts- 

 man, 1911, p. 124. 



A single specimen from Puget Sound of this common species is in 

 the collection, with no data beyond the fact that it is from the 

 Sound. 



CORELLA V/ILLMERIANA Herdman. 



Corella willmeriana Herdman, 1898, p. 252, pi. 11, figa. 1-4. — Ritter, 1900, 



p. 604, pi. 18, fig. 15.— Huntsman, 1911, p. 122. 

 Corella rugosa Huntsman, 1911, p. 122. 



There is certainly considerable difficulty in the way of placing the 

 specimens now under consideration in this species. 



There are five specimens from Puget Sound and eight from Loring, 

 Alaska. Taken altogether these differ in such ways from the typical 

 willr)ieriana that, were they to be regarded as specifically distinct 

 from willmeriana, there would be as much reason for making two as 

 one new species, and the line of cleavage betv»^een them would not 

 separate the Puget Sound from the Loring specimens. 



The distinctive characters are as follows: 



Puget Sound specimens: Larger, length as great as 4 cm.; test 

 rather thick and semicartilaginous ; orifices both 6-lobed (as seen on 

 siphon dissected from test), clear though not conspicuous; tentacles 

 47; dorsal languets large, well apart; internal longitudinal vessels 

 about 20 on each side of sac; the coils of branchial stigmata ver}^ 

 regular; stomach rather large and globose, with 20 to 25 longitudinal 

 folds. 



First Loring collection, one specimen, size 3 by 1.5 cm., ver}^ trans- 

 parent, test thin, but somewhat stiff; orifices rather uncertain, 6 or 7 

 for each; tentacles 47; dorsal languets large and far apart; internal 

 longitudinal yessels of branchial sac 23 on right and 24 on left; 

 stigmatic spirals very irregular in form and distribution; stomach 

 globular, wall with 20 to 25 folds; anus distinctly lobed. 



