BY W. M. BALE. 795 



the margin, and projecting beyond it, less inclined forward than 

 the mesial, except the distal portions, which are bent forward ; 

 terminal and lateral apertures distinct. Cauline sarcothecaa usually 

 canaliculate, two on the stem at the base of each pinna. 



Gonosome unknown. 



Colour, stems and branches light brown, pinnae whitish. 



Hob. 1 



In the absence of the gonosome the generic position of this 

 species is doubtful, a similar type of hydrotheca being found in 

 species of Aglaophenia, Lytocarpus, and Halicornaria. It differs 

 from most allied species in having each side of the hydrotheca- 

 margin cut into two nearly equal angular lobes instead of one 

 large one. The distal part of the hydrotheca is beat away from 

 the pinna, but not sharply recurved, as in L. Phillipinus or A. 

 longicornis, so that there is no sharp deep constriction of the front 

 of the hydrotheca as in those species, nor anterior intrathecal 

 ridge, as in A. plumosa. 



The only specimen I received is about two inches high, but is 

 incomplete ; there are three or four branches, and the pinnae 

 extend along the greater part of the stem. The pinnae and 

 hydrothecae are colourless, and when filled with remains of the 

 soft parts appear white ; they are very fragile and apt to shrivel 

 when dried or placed in balsam. Possibly, however, other speci- 

 mens may be more robust. 



EXPLANATION OF PLATES XII. -XXI. 



The figures have been drawn with the assistance of the camera lucida, 

 from specimens viewed as transparent objects. 



PLATE XII. 



Fig. 1-2. Obelia amtralis, v. Lend. Lyttleton, N.Z. (from Dr. von 



Lendenfeld's type specimen). 

 Fig. 3. Obelia angulosa, n.sp. Parramatta River. 



