94 Proceedings of the Royal Society of Victoria. 



to the hydrotheca, is, as I have previously suggested, illusory, 

 the appearance of an outer calycle being caused by a solid 

 thickening of the perisarc, such as is common in the hydrothecse 

 of many Plumularice and at intervals along the hydrocladia of 

 nearly all ; while the discovery that this species possesses mesial 

 nemataphores which are unprovided with sarcothecse assigns to it 

 a place under Jickeli's genus Kirchenpaueria^ to which genus also 

 it is now evident that the very closely related species Azygoplo7i 

 productiim ( Pluniidaria prodiicta), Bale, must al so be relegated. 



Two or three species of Eudendrium are included in the 

 collection, but although the hydranths are present, their con- 

 dition is not such as to enable me to decide satisfactorily whether 

 they are to be referred to any of the species already known, some 

 of which differ very slightly from each other, especially in regard 

 to the polypidom. In such cases it appears very desirable that 

 confusion of species should be avoided by describing only such 

 forms as are examined in a perfectly fresh condition, and in 

 which the gonosome is present, as the smallest details, even the 

 colour, must be taken into consideration. 



My thanks are due to Mr. A. J. Campbell, F.L.S., for speci- 

 mens of three or four species representative of the unexplored 

 hydroid -fauna of Western Australia, one of them — a large species 

 of Aglaophenia — being new ; also to Dr. MacGillivray for a new 

 species of Pbmiularia from the Snowy River, as well as a few 

 other specimens. 



Halocordyle australis, n. sp. 



Hydrocaulus branched (monosiphonic ?), small branches biserial, 

 alternate, polypiferous ramuli biserial, rather irregular, both 

 series directed to the front ; all branches strongly and closely 

 ringed for a considerable distance above their point of origin and 

 above the point at which other branches spring from them ; 

 polypiferous ramuli and some of the others ringed throughout ; 

 polypiferous ramuli not expanded towards the aperture. Hy- 

 dranths large, flask-shaped, with a stout cylindrical proboscis 

 rounded at the top, about 8 or 10 filiform tentacles springing 

 from the lower part of the body, and four or five short capitate 

 tentacles surrounding the proboscis. 



