79Q SOME NEW AND BARE HYDEOIDA IN THE AUSTRALIAN MUSEUM, 



lobes at the sides of the former. Each gonangial pinna bears a 

 single gonotheca with a pair of sarcothecae, and the distal portion 

 is reduced to a blunt spine. The proximal internode bears 

 appendages, but the figure is not sufficiently detailed to indicate 

 whether they are hydrotheca3 or sarcothecae. The gonothecae are 

 described as unusually small, but visible to the naked eye as black 

 points. The ring of bright granules, which in the allied species 

 surrounds the sporosac, is not shown in Kirchenpauer's figure of 

 this species. 



L. urens possesses powerful urticating properties, being described 

 as stinging like a nettle. 



AGLAOPHENIA PARVULA, Bale. 



Hdb. Port Jackson. 



In these specimens the second tooth on each side of the 

 hydrotheca is almost completely merged with the third, a condition 

 also common in Victorian specimens. 



AGLAOPHENIA SINUOSA, n.sp. 



(Plate XXI., figs. 1-2). 



Hydrocaulus monosiphonic, slightly branched, 1-2 inches high ; 

 pinnae long, approximate, alternate, one on each internode. Hydro- 

 thecae set at an angle of about 40, tapering to the base, with two 

 well-developed intrathecal ridges, one close to the base of the 

 calycle, on the side next the pinna, the other near the middle on 

 the opposite side ; the hydrotheca constricted at each of the ridges ; 

 aperture nearly horizontal, margin with a median tooth in front and 

 four teeth on each side, the last pair opposite the lateral sarcothecae, 

 (one pair sometimes obsolete), back adnate ; a median ridge or 

 keel running along the front of the hydrotheca from the anterior 

 intrathecal ridge and terminating in a point over the median 

 marginal tooth. Hydrothecal internodes sometimes provided with 

 1-3 transverse folds. Mesial sarcotheca about half the length of 

 the hydrotheca, or rather less, prominent, canaliculate. Lateral 



