500 PROCEEDINGS OF THE NATIONAL MUSEVJI. vol.45. 



Turning to the digestive tract, the descriptions and figures given 

 by botli Hartmeyer and Van Name make it apparent tliat the stomach 

 of jJrunum graduates more insensibly into the mtestme than it does 

 in adhserens. By this difference what corresponds to tiie duodenal 

 section of the intestine is broad at its proximal end and tapers 

 distally in 'prunum, whereas in adhxrens it is of nearly uniform diam- 

 eter throughout. Again, the foldmg of the stomach wall is usually 

 distmctly seen on the outer surface of the organ m adhxrens, while 

 this seems not to be so in prunum. There are probably other, smaller 

 differences between the two species, but these are sufficient to indicate 

 their distinctness. 



It appeal's to me extremely doubtful if P. columbiana Huntsman is 

 distinct from adhxrens. 



Three specimens, Kodiak Island, 16-25 fathoms, gravel bottom, 

 W. H. Dall. 



One specimen. New Harbor, Unga Island, 1872, W. H. Dall. 



One specimen, Sitka, L. A. Beardslee, collector. 



One specimen. Albatross 3558, lat. 56° 58' N.; long. 170° 09' W., 

 Beriag Sea, 25 fathoms, s. dk. sp. rky., September 3, 1893. 



Ten specimens, Bering Sea, summer, 1900, Dr. H. Horn. 



One specimen, Albatross, Loring, Alaska, April 29, 1903, Alaska 

 salmon investigations. 



The specimens collected by Doctor Horn are worthy of special 

 mention m that, though from Bering Sea (it is unfortunate that the 

 locahty is not more definite), they are, in outward features at least, 

 somewhat more typical than most of the other specimens coming 

 from nearer the original localities, namely, the Shumagin Islands and 

 Yakutat Bay. 



CIONA INTESTINALIS (Linnaeus). 



The single specimen of Oiona in the collection is so badly out of 

 shape and contracted that determination of all its characteristics is 

 impossible. So far as can be ascertained, however, nothuig would 

 warrant separating it specifically from the old and widely distributed 

 species. . And in view of the fact that the species is definitely known 

 to occur in the whole arctic region and also on the coast of Japan, 

 western Canada, and California, it would be expected to be found in 

 Alaskan watere. 



The tentacles, branchial sac, and dorsal languets agree entirel}^ 

 with those of typical intestinalis. Uncertainty exists only as to the 

 relation of the digestive tract and gonads, and here the uncertamty 

 is entirely from the impossibihty of determining the exact state of 

 things, not from any recognized disagreement. 



One specimen. Albatross, Alaska salmon investigations, Loring, 

 Alaska, April 29, 1903. . 



