684 



THE INVERTEBRATA 



sn.'gl 



oe. 



Fig. 482. A semidiagrammatic view of left side of Salpa. From Herdman. 

 An. anus; at. atrial aperture; emb. embryo in ovisac; est. endostyle; gill, 

 "gill" (hyperpharyngeal band);^a. nerve ganglion; h. heart; Igt. the single 

 languet ; M. branchial aperture ; m. muscle bands ; oe. oesophagus ; pbr. peri- 

 branchial cavity; ph. pharynx;/)^/?, peripharyngeal band; sn.gl. subneural 

 gland ; st. stomach ; t. testes ; tst. test. 



Fig. 483. Doliolum and its life history. From the Cambridge Natural History, 

 after Uljanin and Barrois. A, The larva, from the right-hand side. B, The 

 same view of the adult asexual individual (oozooid). C, Dorsal view of the 

 hinder region of an older oozooid, more highly magnified. D, Stolon, more 

 highly magnified. E, Probud in migration, more highly magnified. F, Gas- 

 terozooid. At. atrial opening; b. probuds; Br. branchial opening; cl. cloaca; 

 d.p. dorsal process (cadophore); est. endostyle; h. heart; Lb. lateral buds; 

 m.b. median buds; n.g. nerve ganglion; ot. otocyst; p.c. pericardial cavity; 

 stig. stigmata; stk. stalk; stn. stolon. 



