vou2, pt. 2.] A TAXONOMIC STTJDY OF THE SALPIDAE METCALF. 101 



Philippine Islands; June 7, 1909; surface; surface temperature, 86° F.; 

 1 specimen. 



Cat. No. 6544, U.S.N.M. (aggregated form), Albatross station D. 

 5175, Suiu Sea, southeast of Cagayanes Islands, Philippine Islands; 

 March 8, 1908; surface; surface temperature, 82° F.; 10+ specimens. 



Cat. No. 6545, U.S.N.M. (solitary and chain forms), Albatross 

 station D. 5186, between Panay and Negros, Philippine Islands; 

 March 30, 1908; surface; surface temperature, 80° F.; surface den- 

 sity, 1.02530; 3 specimens. 



Cat. No. 6546, U.S.N.M. (solitary and chain forms), Albatross 

 station D. 5500, northern Mindanao and vicinity, Philippine Islands; 

 August 4, 1909; surface; surface temperature, 84° F.; 6 specimens. 



Cat. No. 6547, U.S.N.M. (solitary and chain forms), Albatross 

 station D. 5672, Macassar Strait, Philippine Islands; December 30, 

 1909; surface; surface temperature, 83° F.; 15+ specimens. 



Cat. No. 6548, U.S.N.M., Albatross station D. 5633, south of 

 Patiente Strait, Philippine Islands; December 2, 1909; surface; 

 surface temperature, 84° F.; 10+ specimens. 



Cat. No. 6549, U.S.N.M. (solitary and chain forms), Albatross 

 station D. 5500, northern Mindanao and vicinity, Philippine Islands; 

 August 4, 1909; surface; surface temperature, 84° F.; 20+ speci- 

 mens. 



Cat. No. 6550, U.S.N.M. (aggregated form), Albatross station D. 

 5530, between Siquijor and Bohol Islands, Philippine Islands; 

 August 11, 1909; surface; surface temperature, 84° F.; 4 speci- 

 mens. 



Cat. No. 6587, U.S.N.M. (aggregated form), Albatross station D. 

 5601, Gulf of To mini, Celebes; November 13, 1909; surface; surface 

 temperature, 83° F.; 2 specimens. 



Cat. No. 6629, U.S.N.M. (aggregated form), Albatross station D. 

 5672, Macassar Strait, Philippine Islands; December 30, 1909; sur- 

 face; surface temperature, 83° F.; 25+ specimens. 



IASIS ZONARIA, solitary form. 



There are apparently five broad body muscles (fig. 90) interrupted 

 both dors ally and ventrally. The fifth extends only a short way 

 down on the sides of the body. Possibly this should be accounted 

 a basal atrial sphincter. What seems to be the intermediate muscle 

 (i. m.) is of much the same appearance as the body muscles and 

 evidently functions with them. 



The oral musculature is unique among the Salpidae. Streiff (1908) 

 describes it without figures, indicating that his figure of the oral 

 muscles in the aggregated form shows also the condition in the soli- 

 tary form. I find the oral musculature in the two forms very dif- 

 ferent. All of my many specimens of the solitary Iasis zonaria 



