. CATALOGUE OP TUNICATA. 29 



sides. In the single specimen there seem to be 7 folds on the right 

 side, and 6 only on the left; this may well be an individual variation, so 

 it is impossible to say yet whether the normal number is 6 or 7. 



Towards the left side of fig. 6 is seen an irregularity in the stigmata of 

 the branchial sac, such as is present here and there. The dorsal languets 

 (fig. 7) spring from a narrow membrane, which has a strong muscle 

 band at its base. The simple little dorsal tubercle is shown in fig. 8; 

 while figs. 9 and 10 show the alimentary and reproductive viscera of the 

 left and right sides respectively. The gonads are broken up into ovate 

 masses, nearly detached from one another, merely adhering by twigs to a 

 central stem and packed closely together. 



Cynthia solanoides, n. sp., PI. Cyn. VIII. 



External appearance. An irregularly ellipsoidal mass of solid appear- 

 ance, and with both apertures on the wide anterior end. Not flattened 

 laterally. Not attached, or only very slightly, by the narrow posterior 

 end. Apertures both prominent and 4-lobed. Surface even, but roughish ; 

 partly encrusted. Colour dirty grey brown. Length 8 cm., breadth 

 5'5 cm., thickness 5 cm. 



Test firm, cartilaginous ; thin anteriorly, thickening up to 7 mm. 

 posteriorly. 



Mantle muscular anteriorly, thin and membranous posteriorly. Both 

 siphons very large and muscular. Sphincters especially powerful. 



Branchial sac with about 8 folds on each side. Internal longitudinal 

 bars very wide, ribbon-like ; meshes elongated transversely, containing 

 each about a dozen wide stigmata. Very wide loose horizontal membranes 

 present on the transverse vessels. 



Dorsal lamina a very short smooth ridge. 



Tentacles very large and much branched, forming a tangled mass 

 about 1-5 cm. in length. There are 6 larger and 6 smaller. 



Dorsal tubercle large, and spongy in appearance. 



Alimentary canal and gonads sunk in the thick fleshy mantle. 



Locality. Port Jackson ; one specimen. 



This species has a peculiarly solid appearance, and looks not unlike a 

 dirty stone, and still more like an old, somewhat battered potato, hence 

 the specific name. 



The apertures are most conspicuous (fig. 1), and are both of them 

 cross-slit. 



The test is very stiff and solid for its thickness. There are a number 

 of thin vessels ramifying freely through all parts (fig. 4). 



