32 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



have numerous others, embryos, but have not given them careful 

 study. 



The chief studies of Cyclosalpa affinis have been made by Ritter 

 (1905) and by Ritter and Johnson (1911). A few minor discrepan- 

 cies between their work and ours will be noticed as to the lip muscles, 

 the branching of the atrial sphincters, and the presence of an atrial 

 retractor; also they fail to describe the muscles of the peduncle- 

 Brooks has shown the latter in his figures (Brooks, 1893, pi. 8), but 

 not as we have indicated them. We find them as we show them in 

 specimens from both the Atlantic and Pacific coasts of America. 



CYCLOSALPA FLORIDANA (Apstein, 1894, b, not 1906, a). 



Cyclosalpa dolichosoma-virgula Traustedt, 1893 (according to Apstein, 1894, 6). 

 Salpa floridana Apstein, 1894, b, (type). 

 Cyclosalpa fioridana Ihle, 1910. 



This, the most aberrant of the Cyclosdlpae symmetricales, has its 

 nearest relative apparently in C. bakeri, one of the two species com- 

 posing the Cyclosdlpae asymmetricales , but we shall compare it first 

 with the two species already discussed. 



CYCLOSALPA FLORIDANA, solitary form. 



Plate 4, figs. 13 and 14; plate 5, fig. 16. 



Our figures and description are based on the study of three speci- 

 mens 16 mm. long, the same upon which Brooks (1908) worked. 

 These are from Nassau in the Bahama Islands and were collected in 

 May and June, 1907. Specimens of this form are in the United 

 States National Museum. Cat. No. 6452, U.S.N.M. (solitary form) 

 Albatross station D 2585; off Cape May; Sept. 19, 1885; 542 fathoms; 

 surface temperature, 73° F.; one specimen. 



The form of the body, the thickness of the test, and the general 

 arrangement of the viscera and muscles are seen in figure 13, a view 

 from the left side. The luminous organs are a series of five weakly- 

 developed glands similar to those of Cyclosalpa pinnata, but not 

 composed of nearly so many cells. Their position is similar in the 

 two species. The group of cells between body muscles I and II is 

 but about a third as long as one of the next three groups. The fifth 

 group, behind body muscle V, is so slightly developed as hardly to 

 be discernible. 



There are seven body muscles, as we group them. These are all 

 interrupted dorsally, as in Cyclosalpa pinnata. Ventrally each is 

 continuous with its fellow across the mid line, except muscle VI, 

 which is interrupted. In the solitary form of both G. pinnata and 

 C. affinis all of the body muscles are interrupted ventrally. The 

 first, second, third, and fourth body muscles approach each other 



