REMARKS UPON APPENDICULARIA AND DOLIOLUM 



79' 



Fig. 8. A young zooid separated and enlarged. Viewed from the ventral side. 



Fig. 9. Youngest form of gemma observed. 



Fig. 10. "Ciliated fossa," with the ganglion and otolithes. 



Fig 

 Fig, 

 Fig. 

 Fig 



Fig- 

 Fig. 

 Fig. 

 Fig. 

 Fig, 

 Fig, 



Pl. XVIII. [Plate 8] 



1. Appendicidaria Jiagellum. Much magnified. 



2. Still more magnified. 



2". Extremity of the caudal appendage. 



3. Body oi Appendicidaria ixwa behind. 



4. Individual in which the testis is much enlarged. 



5. Doliolum dentictdatum, from the right side. 



6. Doliolum dentictdatum, from below. 



7. A portion of the right wall to show the testis in situ. 



8. The "ciliated sac " and the origin of the " ciliated bands " in Doliolum. 



9. The intestine and heart, with the commencement of the branchiae. 



The letters have throughout the same signification. 



a. Ganglion with the auditory vesicle. p. 



b. Nerve. p' ■ 



c. Endostyle. q- 



d. Respiratory or anterior aperture. r. 

 e,f. Ciliated bands. s. 

 g. Mouth. t. 

 h. CEsophagus. u. 

 i. Stomach. B. 

 k. Intestine. A. 

 /. Anus. ^• 

 n. Axis of the caudal appendage. y. 

 u. A long membrane of appendage. z. 

 u. Bundles of striated muscular fibrils. 



Testis. 



Efferent duct of testis. 

 Supposed ovary. 

 Heart. 

 Liver. 



Muscular bands. 

 Ciliated sac. 



The body of Appendicidaria. 

 The caudal appendage. 

 Hypopharyngeal band. 

 Branchial bars. 



The system of tubules embracing the 

 intestine. 



Pi.. XIX. [Plate 9] 



The diagrams represent imaginary sections of the principal types of the Ascidian family. 

 Without pretending to be strictly accurate, they are sufficiently so to give a just idea of 

 the gradations in structure among the different genera, and of the essential unity of structure 

 which runs through the group. 



