vol. 2, pt. 2.] A TAXONOMrC STUDY OF THE SALPIDAE METCALF. 169 



upon specimens of the subspecies bicaudata. Our collections con- 

 tain specimens from numerous stations along the Atlantic coast of 

 America from Cape Hatteras to Cape Cod. Probably, when this 

 subspecies shall be recognized as distinct from the tailless form, it 

 will be reported from some at least of the other regions included in 

 the reports of Pegea confederata. In our Atlantic Ocean collections 

 bicaudata is found at fewer stations than confederata, and in our col- 

 lections from the eastern Pacific Ocean it does not occur at all. It is 

 surely rare in Philippine waters, if it occurs there. It must also be 

 rare or absent off the southern California coast or Ritter would have 

 reported it ere now. 



Ritteria amboinensis has been reported by Apstein (1906, b, and 

 1904) from the equatorial and southern Atlantic Ocean off the coast 

 of Africa, from the western and the northeastern Indian Ocean, and 

 from the southern East Indies. Ihle (1910) also reports it from the 

 East Indies. It is represented in our collections by a dozen specimens 

 of the solitary form from the central Philippine waters. 



Ritteria Jiexagona is a warm water species. It has been reported 

 from the eastern Atlantic Ocean (Madeira Islands), from east of the 

 Cape of Good Hope, from the northern Indian Ocean, from the 

 southern East Indies, and from between New Zealand and Australia. 

 Our collections add numerous stations in Philippine waters. 



Ritteria picteti. This rare form has been reported by Apstein (1904) 

 and by Ihle (1910) from the East Indies, and by Apstein (1906, b) from 

 off the Somali coast of Africa. It is not represented in our collections. 



Ritteria retracta. The first specimen of this species was collected 

 in Suruga Bay, Japan (Ritter, 1906, b). The Tiefsee Expedition 

 found other specimens. Apstein (1906, b) confused these with u Salpa 

 amboinensis," so that the data as to distribution is not usable. 



Salpa cylindrica, a species long known, has been reported from the 

 northwestern, central, and southeastern north Atlantic Ocean, from 

 the whole equatorial Atlantic Ocean, from the southern Atlantic Ocean 

 west of the Cape of Good Hope, from the northwestern, the north- 

 eastern, and the southern Indian Ocean, from many stations through- 

 out the East Indies, from off Formosa, from the eastern Pacific Ocean 

 off the coast of Chile, and off southern California. Our collections 

 add stations in the West Indies, numerous stations in the eastern 

 Pacific Ocean near the Hawaiian Islands, and off the California and 

 Alaska coasts and in the Bering Sea. Numerous stations in Phil- 

 ippine waters are also represented. 



Salpa fusi for mis, one of the earliest known and most abundant of 

 the Salpidae, has been reported from the whole Atlantic Ocean from 

 55° south latitude to 60° north latitude, from the whole Mediterranean 

 Sea, from the whole Indian Ocean and Antarctic waters to 65° south 

 latitude, from the East Indies and the east coast of Australia, from 



