152 



BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



to the subspecies bicristata, for the solitary form of this species has 

 its oral muscles much less developed than do the solitary individuals 

 of the species type which Apstein describes. 



TRAUSTEDTIA RADIATA, new name, solitary form. 



Salpa henseni Apstein, 1906, b. (This seems to be a homonym.) 

 S. multitentaculata Ihle, 1911 (part). 



Apstein (1906, a and b) describes and figures this form and Dober 

 (1912) gives a figure of it. As Dober's and Apstein's figures do not 

 agree, both are included here (figs. 138 and 139). 



Apstein (1906, a) says the form of the body is a short oval. It is 

 rather flat and has a very thick test. No mention is made of any 



Fig. 138.— Transtedtia kadiata, solitary form, dorsal view, x H diameters. From Doher 



(1912). 



crests or ridges such as Apstein (1894, b) had already figured for 

 Traustedtia multitentaculata, in his Plankton Expedition report. 



Body muscles I, II, and III are either fused dorsally (fig. 136, 

 Dober) or approximated (fig. 139, Apstein). Body muscle IV, accord- 

 ing to Apstein, is branched as in the subspecies bicristata. Dober 

 shows the posterior branch interrupted. Probably there was in his 

 specimens a continuance of the muscle blood vessel bridging the 

 space between the tip of this short branch and the point a little 

 farther back where three bands meet. 



