604 THE INVERTEBRATA 



never leaving the body of its parent. In the Salpida oozooid and 

 blastozooids are aHke well developed and free swimming, and the 

 blastozooids, of which there is a long chain, though they may coil 

 into a circle (Cyclosalpa), are incapable of budding and eventually 

 break away in groups (Fig. 456). In the Doliolida there is a tailed 



Fig. 453- Fig. 454. 



Fig. 453. The asexual form (oozooid) of Salpa democratica-jnucronata. From 

 Sedgwick, after Claus. at. atrial opening; Br. "gill" (hyperpharyngeal 

 band); e^i. endostyle; M. mouth; Ma. test; Nu. "nucleus"; Stn. stolon; 

 Wg. ciliated pit. 



Fig. 454. Pyrosoma. A, A colony. B, The same cut open longitudinally. 



larva, and the buds formed on the stolon (in which the epicardial 

 tubes remain separate) break free one by one, though they sub- 

 sequently make attachment to a dorsal process of the mother, by 

 whom they are carried for some time. 



