REPORT ON THE TUNICATA. 



37 



Fiji's 1 investigations have established that the endostyle is an organ for the secretion 

 of mucus, which is carried upwards to the anterior end of the sac by the action of the 



It reaches the dorsal lamina, where, along with 



Ions; cilia on the floor of the groove 



O O 



U.S. 



Flo. 8. — Transverse section of the Endostyle of Mulgala gigantea. 

 br.s.e., epithelium lining branchial sic; hr.s.e'., epithelium on outer side of branchial sac; mt.e., epithelium lining mantle ; ec., ecto- 

 derm ; mi., mantle ; br.s., wall of branchial sac ; En.L, lip of endostyle groove ; ep., 1st epithelial pad on inner lip of endostyle ; «//., 

 '2nd epithelial pad ; ep".,3rtl epithelial pad ; m., transverse section of inner bundles of muscular fibres ; mi, transverse section of outer 

 bundles of muscular fibres ; v.v., great ventral vessel ; U.S., small blood sinuses; p.br., peribronchial chamber. 



entangled food-particles, it forms a long string, extending down to the oesophagus, by being 

 carried round the peripharyngeal groove, lying between the two peripharyngeal bands. 



The endostyle is remarkably similar in all the Tunicate, and very rarely furnishes 

 characters which can be made use of in classification. 



1 Ueber die Schleimdruse oder ilen Endostyl Jcr Tunicaten. Morphol. Jahrbuch., BA i.. p. 2-2:i. 1874. 



