6o6 



THE INVERTEBRATA 



tst. einb. 



oe. I. 



Fig. 457. 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); ga. nerve ganglion; h. heart; Igt. the single 

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

 peribranchial cavity ; ph. pharynx ; pph. peripharyngeal band ; sn.gl. subneural 

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



Fig. 458. 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, Gasterozooid. 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. 



