794 SOME NEW AND RARE HYDROIDA IN THE AUSTRALIAN MUSEUM, 



main leaflet giving origin at the base to a smaller secondary free 

 leaflet, which h directed forwards and downwards, and has the 

 anterior margin fringed with sarcothecse. 



Colour, brown. 



Hab. — Port Denisou. 



This species, in the foi-m and position of the caljcles and the 

 relative shortness of the mesial sarcothecse, is Avbolly unlike any 

 other Australian species yet known. I have received only a single 

 incomplete specimen about | of an inch long. The pinnse are 

 long and the stem is slender, composed of two or three tubes only. 

 The corbula is very remarkable, as half of each leaflet is devoted 

 to the formation of the proper corbula-wall, while the other half 

 is a broad free wing. The secondary leaflets take the place of the 

 process which in some species bears a hydrotheca, but are peculiar 

 from their comparatively large size. T.^e two series of these 

 appendages are directed backwards from the corbula, so that the 

 rachis is between them. Only one corbula was present. 



[Aglaophenia (1) Whiteleggei, n.sp. 



(Plate XXL, fig. 8). 



Hydrocaulus polysiphonic, with ascending branches; pinnae 

 long, alternate, one on each intei-node, both series springing from 

 the front. Hydrothecse having cheir proximal portion nearly 

 parallel with the pinnae, distal poi'tion curved outwards so that the 

 aperture is nearly vertical, a fold or rudimentary intrathecal ridge 

 a little above the base, on the side next the pinna, aperture with 

 a long slightly incurved tooth in front, and two triangular or 

 slightly rounded lobes at each side, back entire, free. Hydrothecal 

 internodes with two folds, one opposite the fold of the hydrotheca, 

 the other at the base of the lateral sarcothecae. Mesial sarcotheca 

 tubular, a little longer than the hydrotheca, free part projecting, 

 somewhat swollen in the middle, with distinct terminal and lateral 

 apertures, and an orifice opening into the hydrotheca. Lateral 

 sarcothecse tubular, divergent, adnate to the hydrotheca as far as 



