CATALOGUE OF TUNICATA. 103 



common cloacal apertures can be seen under a low power of the micro- 

 scope (40 diameters) as elongated apertures, along the edges of which a 

 membrane, slightly folded, stands out like a frill (fig. 2). 



Test has large test cells and a system of irregularly branching and 

 anastomosing vessels (fig. 3), which give off large elongated knobs (fig. 4), 

 in some of which ova and young buds are found, as well as blood 

 corpuscles (fig. 5). Some of these knobs are much swollen in size. 



Ascidiozooids placed at right angles to the surface, and form a layer 

 not more than 2 mm. thick below the surface. The centre of the colony 

 is formed of dark grey test, with no Ascidiozooids. The viscera are 

 placed alongside the thorax, and there is a long atrial aperture reaching 

 to about '5 mm. (fig. 7). 



Mantle very delicate. Most of the muscle fibres run transversely. 



Branchial sac long and narrow, with three internal longitudinal bars 

 on each side (fig 6). The number of stigmata in the rows of meshes is 

 as follows : Dor. Lam. 43 2 3 Endost. The stigmata are short 

 and regular. 



Dorsal lamina a plain, straight, wide membrane (fig. 6). 



Tentacles 16 ; 4 large alternating with 4 smaller, and then, nearer the 

 branchial aperture, there are 8 exceedingly short ones alternating with 

 the other 8 (fig. 8). 



The Stomach has 10 longitudinal folds. The anus is about one-third 

 of the way up the branchial sac (fig. 7). 



There is a Gonad on each side of the body. The terminal knobs of 

 the vessels of the test also contain ova and developing buds. Whether 

 the buds are formed there, or have become secondarily connected with 

 the vessels, as Hitter finds is the case in Goodsiria, is still doubtful. 



Locality. Port Jackson ; two colonies. 



The massive lobes rising from a small base of attachment (PI. Bot. II., 

 fig. 1) show that this is a Sarcobotrylloides. 







Sarcobotrylloides anceps, Herdm.,* PL Bot. II., figs. 913. 



Colony an irregularly pyriform mass attached to several of the 

 branches of an erect Ctenostomatous Polyzoon (fig. 9). Colour from 

 dark purple to pink. Very little of the light grey test seen, as almost 

 the whole surface is covered by dark Ascidiozooids. Surface smooth and 

 soft. Length 3 - 5 cm., breadth 2 cm. 



Systems numerous and close, forming branching lines. 



* See Revision," p. 609. 



