98 THE AUSTRALIAN MUSEUM. 



The dorsal lamina is a plain membrane. 



The tentacles are 16 in number (fig. 4). They are of two orders 

 placed alternately, but the large ones are not all of the same size. 

 There are also about 20 atrial tentacles (fig. 5). 



The dorsal tubercle has a simple circular opening. 



The alimentary canal has a short oesophagus leading to a stomach 

 like that of the preceding species, with a corrugated glandular cardiac 

 end and a series of longitudinal folds (about 8 on each side). The 

 intestine is at first narrow, then slightly dilated, and then narrows to 

 form the rectum (fig. 6). The alimentary canal lies with its longitudinal 

 axis antero-posteriorly, and not transversely, as in Cli. sydneyensis. Its 

 course is first ventral, then anterior, then dorsal, then posterior, and 

 then dorsal. There is the usual system of glandular tubules branching 

 over the intestine, and opening into the stomach by a single large duct. 



The reproductive organs are in the form of rounded polycarps imbedded 

 in the mantle. 



Locality. Port Jackson ; one large and six smaller specimens. 



This species differs somewhat from the other species of Chorizocormus 

 in external appearance, as here the stolons are not nearly so well-marked, 

 and the masses of Ascidiozooids are almost continuous with one another 

 (PL Pst. II., fig. 1). There seems in the three above-described species 

 of Chorizocormus to be a rough correspondence between the number of 

 branchial and of atrial tentacles. Chorizocormus sydneyensis, which has 

 the most branchial tentacles, has also most atrial tentacles, Cli. siibfuscus 

 has fewest of both, and Cli. leucopliceus is in an intermediate condition, 

 as follows : 



Branchial tents. Atrial tents. 

 Chorizocormus sydneyensis ... ... 20 (about) 25 



Cli. leucophceus ... ... ... 16 20 



Cli. siibfuscus ... ... ... ... 10 ... 16 



There are apparently always more atrial than branchial tentacles. 



Goodsiria, Cunningham, 1871. 



This genus was only known previously from the South Atlantic and 

 the Strait of Magellan. The Museum collection has added a new species, 

 obtained at Port Jackson. It differs from the other members of the 

 genus in having the test sandy. 



