752 SOME NEW AND RARE HYDROIDA IN THE AUSTRALIAN MUSEUM, 



tissue, with irregular superficial ridges running from the base 

 upwards. The two narrow sides of the calycle-margin are curved 

 outwards, so as to form thick solid everted lips, one of which is 

 higher than the other. 



In Dr. von Lendenfeld's type specimens some of the hydrothecse 

 are more deeply excavated, and he states that deep-water speci- 

 mens have thick hydrothecae, while those from the harbour have 

 thin ones. The specimens which I have described are, however, 

 from the harbour. 



CAMPANULARIID^E. 



OBELIA GENICULATA, Linn. 

 Additional locality. Middle Harbour, Port Jackson 



OBELIA ANGULOSA, n.sp. 

 (Plate XII., fig. 3). 



Hydrocaulus monosiphonic, 1-2 inches in height, usually with 

 numerous sub-erect branches given off from the main stem ; stem 

 and branches more or less zig-zag, with a few rings or spiral turns 

 (mostly 3-5) just above the origin of each peduncle ; peduncles 

 ringed, those on the upper portions of the hydrophyton consisting 

 of 2-4 i-ings, those on the lower portions often twice the length of 

 the calycle, usually having the central part smooth ; hydrothecse 

 alternate, funnel-shaped, generally slightly constricted at the level 

 of the " floor," which is some distance above the base, and 

 situated somewhat obliquely ; margin slightly everted, not 

 toothed, somewhat uneven. 



Gonothecse urn-shaped, mostly very long and slender, with an 

 elevated neck ; peduncle with about 3-5 rings ; upper part of the 

 capsule often marked with faint, not prominent rings. Ova 

 variable in number (often about 15), in two or three rows, or 

 irregularly arranged. Gonozooids not observed. 



Hob. Parramatta River. 



