96 The Genera of the Plumulariidce, 



into alternate longer and shorter internodes, of which only 

 the former bear hydrothecse. Hydrothecae cup-shaped, ex- 

 panding upward, rather short, adnate up to the margin,, 

 aperture at right angles with the pinna. Sarcothecse bitha- 

 lamic, canaliculate, slender at the base and movable; one 

 below each hydrotheca, and one at each side above it ; one 

 between every two hydrotheca, on the intermediate 

 internode ; one at the base of each pinna^ and one on the 

 lower part of each internode of the branches. 



Gonothec^ borne in the axils of the pinnge, long, rather 

 narrow, smooth, tapering about equally to the base and to 

 the small circular apeiture. 



South Channel, Port Phillip Bay, Mr. Hy. Watts. 



This species may be readily distinguished by the long 

 slender stem, with its small branches arranged at short 

 intervals from base to summit. These branches are mostly 

 less than an inch long, and, in the specimens which I 

 examined, were stouter and darker in the proximal portions, 

 from which the pinnae had fallen off. A single branch 

 examined separately bears some resemblance to a shoot of 

 P. setaceoides, but the hydrotheca are more expanding, and 

 differ also in being adnate up to the margin, and in the 

 horizontal aperture. The fold or wrinkle which in P. 

 setaceoides comes between the hydrotheca and the anterior 

 sarcotheca is generally absent or slightly marked in the 

 present species, and the sarcotheca is not so near the hydro- 

 theca as in P. setaceoides, the internodes being longer. 



Plumulaeia obliqua, Saunders, sp. 



I have found branched specimens of this species on sea- 

 weed washed up on the beach at Williamstown. 



Plumulaeia peoducta, Bale. 



This species partakes of the characters of both the Stato- 

 plea and the Eleutheroplea. To the former group it is allied 

 by the anterior position of the intrathecal ridge, a feature 

 common to many Statopleans, while in those species of 

 Plumularia which have a more or less distinct ridge it is 

 posterior in position. The fixed anterior sarcotheca is not 

 in contact with the calycle, and agrees generally with the 

 same organ in many Plumularia, but the laterals, which are 

 usually more distinctive, appear to be totally absent in this 

 species. It should therefore probably be placed in a new 



