V0U2, FT. 2.] A TAXONOMIC STUDY OF THE SALPIDAE METCALE. ( 



United States Bureau of Fisheries x since the year 1875, including 

 extensive lots from the northern, the equatorial, and the southern 

 Atlantic Ocean, from the Pacific Ocean off the South American and 

 North American coasts, from the Hawaiian Islands, and from the 

 Philippine Islands. In addition, I have received material of three 

 species from the Naples Zoological Station. Through the courtesy 

 of Prof. E. A. Andrews, of the Johns Hopkins University, I have 

 received all of Prof. W. K. Brooks's collections of Salpidae, including 

 the specimens of Cyclosalpa jioridana from which he redescribed that 

 rare species. Prof. W. E. Ritter, of the University of California, has 

 also very kindly given me three good specimens of his Cyclosalpa 

 baleen, solitary individuals, one of which bears an old stolon, at the 

 tip of which are well-formed individuals of the aggregated genera- 

 tion. From him I also received two wheels and a very large aggre- 

 gated zooid of Cyclosalpa affinis from the California coast. I wish 

 to express my most hearty thanks for this material to Professor 

 Ritter and Professor Andrews, to the United States Commissioner 

 of Fisheries, and to the authorities of the United States National 

 Museum, and I wish to acknowledge my indebtedness to the Naples 

 Station for the privilege of purchasing their beautifully preserved 

 material. I wish also to acknowledge with thanks the assistance 

 given by the librarian of the United States National Museum in 

 locating in the libraries of Washington and other cities some of the 

 volumes in the literature of the Thalidae which are not easy to obtain. 



Subgenus Cyclosalpa (de Blainville), 1827. 



Five species of this subgenus have been described: 



Cyclosalpa pinnata Forskal, 1775, type. 2 



C. affinis Chamisso, 1819. 



C. Jioridana Apstein, 1894, b (not 1906, b). 



C. bakeri Ritter, 1905. 



C. virgula Vogt, 1854. 



Sigl (1912, a and b) has described as a distinct species Cyclosalpa 

 polae, a form which so closely resembles C. pinnata that it can best 

 be treated as a subspecies of pinnata, much as Salpa aspera is classed 

 as a form of S. fusiformis and S. bicaudata as a subspecies of Pegea 

 confederata. 3 



Cyclosalpa pinnata is the best known of the Cyclosalpas, especially 

 through Brooks' extensive studies. Cyclosalpa affinis, which has 

 been carefully studied by Ritter and Johnson (1911), is a closely 

 related species. Very different from these are C. Jioridana, named 



i Chiefly by the United States Bureau of Fisheries steamor Albatross. 



2 The author prefers the Latin form of this word, typus, when used in the strictly taxonomic sense , 

 but he defers to the custom of the United States National Museum in its publications. 



3 The character of the eye, as well as the presence of appendages, justifies recognizing bicaudata as a some- 

 what distinct form. 



