REPORT ON THE TUNIC AT A. 



47 



Jir. 



Fio. 12.— Diagram of a dissection of Ascklia, from the right side, to show the relations of the different "tunics" and 



cavities, the course of the alimentary canal, Jcc. 

 Br,, branchial aperture; At., atrial aperture; I., test ; m., mantle; br.s., branchial sac; br.s?., outer surface of branchial sac; en., 

 endostyle ; d.l., dorsal lamina ; p.br., peribranchial cavity; in., tentacle; cl., cloaca; as.a., CBSOpl rture; ty., typhlo- 



sole in intestine ; a., anus ; n.g., nerve ganglion ; gl., neural gland ; yl.d., duct from neural gland ; <j., genital organs ; g.d., genital 

 duct. 



