Fur they Notes on Australian Hydro ids. 105 



figured like the others on the stem, while in my specimens they 

 ai*e smaller than the rest, and are curved over so as to point 

 directly to the back of the polypidom. 



Aglaophenia parvula. Bale, var. 



Larger than the type, reaching two to three inches in height, 

 and branched, bi'anches nearly in the same plane. 



Port Phillip Bay (Mr. J. B. Wilson). 



The largest specimen bore five or six branches, one of which 

 was again branched. I have formerly described the hydrotheca 

 of A. parvula as having five teeth on each side, two of which are 

 often folded together so as to resemble a single tooth ; judging 

 from most of the specimens I have since observed, however, it 

 would be more correct to describe the number of teeth as four on 

 each side, one of them being sometimes folded and bifid, the 

 latter being the exceptional rather than the normal condition. 



Aglaophexia (?) Whiteleggei, Bale. 



Port Phillip. 



Of this species, hitherto known only from New South Wales, 

 I have received specimens both from Mr. Wilson and Dr. 

 MacGillivray. The largest specimen is about four inches in 

 height, with a slender stem formed of two tubes in addition 

 to the original jointed filament, and the branches given off" most 

 freely towards the summit, so that the polypidom is somewhat 

 cymose. In all the specimens T have observed the peri sarc is 

 very delicate, so much so that nearly all the cells are generally 

 more or less collapsed and distorted after mounting or drying. 



Aglaophenia carinata, n. sp. 

 (Plate VI., figs. 1-3.) 

 Hydrocaulus polysiphonic, reaching a height of about eighteen 

 inches, much and irregularly branched, stem and main branches 

 thick, branches ascending, pinnfe .short, alternate, one on each 

 internode, both series springing from the front. Hydrothecfe set 

 at an angle of about 40'', deep, narrowed towards the base, not 

 bent; a fold or constriction springing from the side next the 



