BY W. M. BALE. 777 



owing to my former specimens having been all dried, and more or 

 less shrivelled. The female capsules are nearly three times the 

 length of the hydrothecse, pear-shaped, slightly flattened above, 

 and tapering off gradually below, and are provided with a pair of 

 sarcothecae near the base, one on each side. When ripe they open 

 at the summit by a circular operculum, the border of the orifice 

 being very slightly thickened. Between the short pedicle and the 

 capsule itself there is a distinct sub-globular segment. In some 

 specimens the capsules are broader towards the summit than in 

 others. The male gonothecse are considerably smaller, ovate, not 

 flattened at the summit, and have only a single sarcotheca. Male 

 and female gonothecse are borne on the same colony. 



Many of the pinnae of P. campanula bear secondary hydro- 

 cladia, but the character is not constant. A single pinna may 

 bear two or three of these offshoots arranged alternately, and 

 occasionally tertiary hydrocladia are produced. 



The hydrothecal internodes vary considerably in length in 

 different specimens, or even in the same colony, the hydrothecse 

 varying accordingly in their distance apart, so that the superior 

 median sarcotheca, which is normally placed some distance above 

 the hydrotheca, may be situated almost behind the free margin. 



P. campanula differs from all other species known to me (except 

 P. rubra) in the short stout lateral sarcothecse, which, moreover, 

 are not freely moveable. 



The type specimens prove that P. Torresia is identical with 

 P. campanula. Dr. von Lendenfeld represents the calycle-margin 

 as somewhat incurved, and with a double tooth at the back, 

 but as there is no trace of these peculiarities in his types, they 

 are probably due to distortion in mounting. 



Dr. von Lendenfeld's specimens, from Torres Straits, agree 

 precisely with those collected by Mr. Wilson at Port Phillip 

 Heads; others from Broughton Islands have the female gonotheca 

 somewhat narrower. 



