168 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



Iasis zonaria, a very widely distributed and rather abundant 

 species, has been reported from the whole Atlantic Ocean from 40° 

 south latitude to Iceland and the coast of Greenland, the westernmost 

 stations in the north Atlantic Ocean being east of the Bahama Islands 

 and the eastern end of Cuba. It has been reported also from the 

 western and central Mediterranean Sea, from all parts of the Indian 

 Ocean, from the East Indies and Australasia north to Japan, and from 

 the eastern Pacific Ocean from the Straits of Magellan to southern 

 California. Our collections add stations along the east coast of North 

 America from the mouth of Chesapeake Bay to Halifax, Nova Scotia, 

 and numerous localities in the northern Pacific Ocean off the Cali- 

 fornia and Alaska coasts to 56° north latitude. 



Thetys vagina, the largest of the Salpidae, has been reported from 

 the eastern Atlantic Ocean from 30° south latitude to the English 

 Channel, from the western Atlantic Ocean east of the Bahama Islands, 

 from the western Mediterranean Sea, from the southern and western 

 Indian Ocean, from the western Pacific Ocean from New Zealand to 

 Japan and eastward (but not from the East Indies), from the central 

 south Pacific Ocean and from off the southern California coast. Our 

 collections add a northwestern Atlantic Ocean station in the Bay of 

 Funday, stations in Philippine waters, and stations in the eastern 

 Pacific Ocean from the California coast to Behring Sea. 



Pegea confederata, the most abundant species in the Philippine 

 collections, is a widely distributed form and is apparently abundant 

 throughout its range. Most students have failed to distinguish 

 between this form and its subspecies bicaudata. The reports of its 

 occurrence are therefore probably based in part upon collections of 

 the form bicaudata. Ignoring this source of error, we may give the 

 reported localities for P. confederata as follows: the eastern Atlantic 

 Ocean from the Cape of Good Hope to the English Channel, the eastern 

 and western Mediterranean Sea, the western south Atlantic a thousand 

 miles east of Argentina, all regions of the Indian Ocean, the East 

 Indies and the China Sea, and the southern, equatorial, and northern 

 Pacific Ocean from 35° south latitude to the coast of southern Cali- 

 fornia. Our collections add many stations in Philippine waters, and 

 many along the whole eastern coast of America from the Florida 

 Straits to New England (Marthas Vineyard Island). The absence of 

 records of occurrence in northern Californian and Alaskan waters 

 confirms the indication from the distribution in the Atlantic Ocean 

 and shows this species to be a warm-water form. 



Pegea confederata, subspecies bicaudata, has been reported from 

 the Mediterranean Sea (Quoy and Gaimard, 1827, Krohn, 1846, and 

 others), from the Indian Ocean (Lesson, 1832), from the southern 

 Pacific Ocean (Apstein, 1894), and from the East Indies (Apstein, 

 1894). Probably some of the reports of Pegea confederata are based 



