BY H. LEIGHTON KESTEVEN. 285 



longitudinal vessels. The interstigmatic vessels are finer than 

 the stigmata (Plate xxvii., fig. 19). 



The endostyle is very conspicuous; its course is very serpentine, 

 the loops being deeper than broad. 



The dorsal lamina (Pl.xxvii., fig.18) is represented by numerous 

 long languets. 



The dorsal tubercle is small, obtuse cordate, with the ends 

 turned in (PI. xxvii., fig. 14). 



The tentacles are very numerous, varying slightly in length, but 

 without regularity. 



The genital gland is situated in the intestinal loop; the vas 

 deferens is a conspicuous object of light salmon-pink colour, 

 attached to the rectum along its inner side. At its termination, 

 just below the anus, there is a brilliant vermilion swelling. 



The alimentary canal. — The oesophagus opens from the 

 branchial sac far back, almost at its posterior end, and is quite 

 a short tube. The stomach is oval in shape, placed at the extreme 

 posterior end of the body. The gut immediately beyond the 

 stomach curves sharply forward and slightly dorsalwards; one- 

 third of the way up the body it again bends sharply, ventralwards 

 and back to the posterior end; once more it turns forward, and, 

 passing up the dorsal side, reaches to the base of the atrial siphon 

 (Pl.xxvii., fig.17). 



The specimens, from which this description is drawn, will be 

 presented to the Australian Museum. 



Cigna intestinalis var. diaphanea, Quoy & Gaimard. 



Ascidia diaphanea Quoy & Gaimard, Voy. de 1' Astrolabe, Zool. 

 iii., 1835, p.612, pl.91, figs.10-11. 



During April, 1903, the late Mr. Alexander Morton sent me 

 a small collection of Tunicata dredged in Hobart Harbour. The 

 most abundant species in the collection is that which I propose 

 to associate with the above name. Besides this form, there is 

 another with a^diaphanous test, Corella valentince (infra). The 

 identification, it must be admitted, is very doubtful; it rests on 

 the facts that A. diaphanea was obtained in large numbers from- 



