96 



BULLETIN 100, UN J TED STATES NATIONAL MUSEUM. 



anco these connective tissue fibers lie just in front of and practically 

 continuous with the ventral ends of the intermediate muscles. One 

 is a little doubtful whether these conditions justify comparison func- 

 tionally with the muscle bands in the anterior protuberance in the 



Fig. 8.3.— Salpa cylindrica, aggregated zoOid from the left side of the stolon, viewed from 

 the left side. x 7 diameters. the specimen was collected off the coast of china. (drawn 

 by Hoyt S. Hopkins.) 



solitary Brooksia rostrata. Similar fibers are seen in the posterior 

 protuberance of the aggregated Salpa cylindrica, and in both the 

 anterior and the posterior protuberances of the aggregated zooids 

 of Salpa maxima and S. fusiformis, but in all three species the test is 

 too thick and firm to allow much if any movement. 



+Zb. 



Fig. 84.— Salpa cylindrica, aggregated zo6id from the left side of the stolon, dorsal \ikw. 

 x 7 diameters. the specimen was collected off the coast of china. (drawn hy hoyt s. llof- 



KINS.) 



The five body muscles are continuous across the dorsal mid line and 

 are arranged in two groups, I, II, and III in contact dorsally, as also 

 are IV and V. Muscles III and IV are in contact in some specimens, 

 while in others they are distinct. Body muscle V is branched in the 



