Australian Hydroids. 335 



the whole, judging from tlie figure and the <lescriptions, the most 

 that can be said is that they may just possibly In? intended for the 

 ■species before us. 



The specimens of both sj^ecies of Tibtana were said to be in the 

 Museum d'histoire naturelle, but Billard does not refer to them in 

 his revision of the Lamarck collection. T. ramosa is said to 

 inhabit the seas of New Holland. 



EuDENDRiuM GENERA LE von Lendenfeld. 



Endendrium generalis, v. Lend., Proc. Lin. Soc. N.S.W., 

 ix., 1884, p. 351, pi. vi. Kirkpatrick, Sci. Proc. Roy. 

 Dubl. Soc, vi. (N.S.), 1890, p. GOT, pi. xv., figs. 1-2. 



Eudendrium generalt, v. Lend., Proc. Lin. Soc. N.S.W., ix., 

 1884, p. 621. 



Hydrosoma about 3 inches in height, stem fascicled at base, 

 "branched and re-branched pinnately, branches ascending, alter- 

 iiate, rather distant, both series borne towards the front; branches 

 and branchlets irregularly annulated for a short distance above 

 their origin, and occasionally elsewhere. 



Hydranths large, with about 18-20 tentacles, 4-6 clusters of 

 nematocysts forming a circlet a little above the base. 



Female gonophores about .4 mm. in diameter, 3-6 on a hydranth, 

 <?rowned with a convex cap of nematocysts. Male gonophores mon- 

 iliform, borne in verticils on the base of a hydranth. Hydranths 

 Avhich bear gonophores often more or less atrophied. 



Specimens of this hydroid Mere dredged in Port Phillip by the 

 late Mr. J. Bracebridge Wilson. Von Lendenfeld's figure shows 

 four female gonophores (called by him the male) of equal size and 

 i^ymmetiically arranged around a hydranth; in my specimen!? there 

 ai*e from three to six, of varying »size according to the order of 

 •development. 



To the accounts of von Lendenfeld and Kirk})a(iick it may bo 

 added that each hydranth is provided witli about four to six small 

 pads or cushions consisting of clusters of thread-cells, and that most 

 -of the female gonophores are surmounted l)y a cuslnon of the same 

 kind, but usually largei-, from which stream out tufts of filaments 

 about 1 mm. in length, and slightly tliickened at the ends. In 

 E. arhuscula and E. cainlldrt similar structures are found on tlio 

 male gonophores. 



