HYDROIDA. — BALE. 315 



This form, in its minute structure, does not differ greatly 

 from the type, except in the peculiarity above mentioned. 

 The upper sarcotheca is much enlarged, and forms an egg- 

 shapecl receptacle projecting laterally outwards ; the series of 

 median sarcothecse which are borne on the proximal part of a 

 branch (before the hydrocladia begin) are also very large. 



I have seen a specimen with the top of the stem produced 

 into a tendril-like stolon. 



Loc. — South Australia. 



Aglaophenia decumbens, Bah. 



Aglaophenia decumbens, Bale, Biological Results " Endea- 

 vour," ii., 1, 1914, p. 48, pi. iv., fig. 4, pi. vi., fig. 6. 

 Id., Briggs, Rec. Austr. Mus., x., 10, 1914, p. 300 ; Id., 

 Briggs, Proc. Roy. Soc. N.S. Wales, xlviii., 1915, p. 315. 



The height of specimens observed after the description was 

 written is about a foot. The stem is very slender (only about 

 half a millimetre), and nearly equal throughout most of 

 its length. Only the lowest three inches were bare, the rest of 

 the stem bearing numerous irregular branches about one half 

 to one inch apart. Secondary and occasionally tertiary 

 branches were observed. 



The gonosome was not present, either in the " Endeavour " 

 specimens or in those since recorded by Briggs from near 

 Cape Pillar, Tasmania. There is a decided affinity between 

 the species and A . divaricata ; it may therefore be anticipated 

 that the corbulse will prove to be of the open type found in 

 that species. 



In Briggs' specimens, from two Tasmanian localities, the 

 anterior teeth of the hydrothecse are without the outward 

 bend which I have figured ; this feature therefore is probably 

 exceptional. 



Loc. — Oyster Bay, Tasmania, 60 fathoms (not Bass Strait, 

 as stated in the original description). 



Aglaophenia macrocaepa, Bale. 



Aglaophenia macrocarpa, Bale, Proc. Linn. Soc. N.S. Wales, 

 (2), iii., 1888, p. 791, pi. xxi., figs. 3, 4 ; Id., Bale, 

 Biological Results " Endeavour," ii., 1, 1914, pp. 32, 

 36, 38-41, pi. iii., fig. 1, pi. vi., fig. 1, pi. i., figs. 1-2. 



Aglaophenia crucialis, Ritchie, Mem. Austr. Mus., iv., 16, 

 1911, p. 864, pi. Ixxxvi., fig. 1. 



