CATALOGUE OP TUNICATA. 105 



Branchial sac very long and narrow, at least 14 to 16 rows of 

 stigmata, with 10 or 12 stigmata in a row. There are 3 internal longi- 

 tudinal bars on each side, and from 2 to 4 stigmata in a mesh. 



Dorsal lamina a narrow membrane. 



Tentacles 16 ; 4 larger with 3 smaller between each pair, of which the 

 middle one may be longer than its neighbours. 



Alimentary canal. Stomach rather globular, with a long vermiform 

 caecum (tig. 6, CCB.}, enlarged a little at the end, and with about 10 longi- 

 tudinal grooves (fig. 7). 



Gonads. 9 or 10 masses of spermatic vesicles, forming a gonad on 

 each side of the body. 



Locality. Port Jackson ; about a dozen masses (fig. 10). Port 

 Stephen ; one colony (fig. 8). Many buds are present in the latter 

 specimen. 



Sarcobotrylloides pannosum, Herd., :;: PL Bot. III., figs. 1 5. 



Colony formed of long, fleshy lobed masses branching irregularly so 

 as to give a ragged appearance (fig. 1). Colour a grey slatey brown. 

 Surface smooth. Size of colony about 15 cm. by 3 cm. by T5 cm. 



Systems very irregular, can only be traced at the edges of the colony. 



Test light grey, closely crowded with Ascidiozooids. The Ascidiozooid 

 appears under a lens as a brown mass with the branchial aperture as a 

 dark dot surrounded by a faint white line. The common cloacal aper- 

 tures very inconspicuous. Vessels small and not numerous in the test, 

 but bearing many terminal bulbs. No pigment cells or bladder cells are 

 present, and the test cells are small. 



Ascidiozooids about 2 mm. in length, set at right angles to the surface 

 (fig. 2). 



Mantle thin, transparent. 



Branchial, sac long and narrow, with about 14 rows of stigmata, and 

 10 or 12 in a row. There are 3 internal longitudinal bars on each side. 

 In some cases the stigmata between the dorsal lamina and the first bar 

 are very irregular (see fig. 3). The stigmata are rather short and wide 

 (fig. 4). There are from 2 to 4 in a mesh. 



Dorsal lamina a plain narrow membrane (fig. 5). 



Tentacles 8, large and small alternately. 



Dorsal tubercle. A simple rounded aperture outside the peripharyngeal 

 band (see fig. 5, d. t.). 



* See " Revision," p. ti09. 



