286 STUDIES ox TUNICATA, 



moderate deptlis near Hobart Town, and had eight-lobed aper- 

 tures, the lobes being each ornamented with a red spot. Quoy 

 &, Gaimard's figure depicts neither of these forms, nor has either 

 of them the branchial aperture at one end and the atrial close to 

 the other, making a right angle with the former. The form which 

 I associate with the name is abundant, as described, has eight 

 lobes to the branchial and six to the atrial aperture, the lobes 

 being ornamented with pink spots. Corella valentince has seven 

 lobes to the branchial and five to the atrial aperture; pigment 

 spots are present betw^een the lobes, not on them. 



One is fairly safe to conclude that the French writers had one 

 of these species, since they are both common in the locality 

 whence theirs came; the probability is that they had both, so 

 that, notwithstanding the discrepancies, one may confidently apply 

 this name to one of them. I have selected the Ciona on the 

 character of the branchial aperture, and the fact that it is more 

 common than the Corella. 



This variety differs from var. sydneiensis in the following 

 characters. 



TJie branchial sac has not the same regularity, the finer trans- 

 verse bars varying in diameter; usually they are much wider than 

 in the Port Jackson form, so that the stigmata are relatively 

 shorter and wider. There are about eight stigmata to a mesh. 



2'he dorsal tubercle has the arms curved rather more inwards. 



Apart from these features, no difference can be detected; the 

 characters of the branchial sacs, however, are constant in both 

 forms and will usually serve to distinguish them. 



Portion of the material which I have studied will be presented 

 to the Australian Museum. 



Corella valentine, sp.nov. 



(Plates XXV., figs. 6-8; xxvi., fig.9; xxvii., figs.6-10). 



External appear anceiVX.x^v'n., figs.9-10) — Osving to die softness 

 of the test, all the specimens are more or less distorted; apparently 

 they were of ovoid shape, the long axis being dorsi-ventral. Both 

 siphons are anteriorly situated nearer to the ventral than to the 



