REPORT ON THE TUNICATA. 



201 



Br. 



Its'. 



Fig. 22. — Diagram of a dissection of Asculia, from the right side, to show the relatious of the different " tunics " and 



cavities, the course of the alimentary canal, &c. 

 Br., branchial aperture; At., atrial aperture; t.., test ; m., mantle; br.s., branchial sac; 6r..«\, outer surface of branchial sac; en., 

 endostyle ; d.L, dorsal lamina ; p.br., peribronchial cavity; in., tentacle; cl., cloaca; ce.a., oesophageal aperture; ty., typhlo- 

 sole in intestine ; a., anus ; n.g., nerve ganglion ; <jl., neural gland ; (/l.d., duct from neural gland ; >j., genital organs ; g.d., genital 

 duct. 



