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



89 



Bay, Philippine Islands; June 7, 1909; surface; surface temperature, 

 86° F.; 2 + specimens. 



Cat. No. 6528, U.S.N.M. (solitary form), Albatross station D. 5128, 

 Sulu Sea, vicinity southern Panay, Philippine Islands; February 4, 

 1908; surface; surface temperature, 80° F.; one specimen. 



Cat. No. 6554, U.S.N.M. (solitary form), Albatross station D. 5456, 

 east coast of Luzon, San Bernardino Strait to San Miguel Bay, 

 Philippine Islands; June 7, 1909; surface; surface temperature, 

 86° F.; one specimen. 



Cat. No. 6580, U.S.N.M. (solitary form), Albatross station D. 5456, 

 east coast of Luzon, San Bernardino Strait to San Miguel Bay, 

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

 F.; 10+ specimens. 



Cat. No. 6581, U.S.N.M. (solitary and aggregated forms), Albatross 

 station D. 5128, Sulu Sea, vicinity southern Panay; February 4, 

 1908; surface; surface temperature, 80° F.; 5+ specimens. 



Cat. No. 6582, U.S.N.M. (solitary and aggregated forms), Albatross 

 station D. 5128, Sulu Sea, vicinity southern Panay; February 4, 

 1908; surface; surface temperature, 80° F.; 6+ specimens. 



SALPA FUSIFORM IS, solitary form. 



The body muscles (fig. 73) are similar in number and arrangement 

 to those of S. maxima, except that they extend more ventrally than 

 in S. maxima, and muscles I, II, and III approach and usually touch 

 dorsally, as do also muscles VIII and IX. 



Xk. 



a.o. 



Fig. 73.— Salpa fushormis, solitary form, viewed from the right side. 



(Drawn by Hoyt S. Hopkins.) 



X 4 diameters. 



The oral muscles are drawn in figure 74. The atrial muscles are 

 well shown in Streiff's figure (fig. 75). Both sets of muscles are very 

 similar to those of Salpa maxima. S . fusiformis shows an interruption 

 of the delicate atrial sphincters, near the mid-dorsal line, as does 

 Apsteinia punctata (fig. 52, p. 74). 



The large dorsal eye (fig. 76) is very similar to that of Ritteria 

 hexagona (figs. 39 and 40, p. 66) in histological condition and in form, 

 except that the postero-lateral regions are not enlarged, and the 



