BY R. VON LENDENFELD, PH.D. 349 



2. FAMILY CLAVID^E. Von Lendenfeld, 1884. 

 Colonies consisting of a creeping stolon from which Polypes 



grow up. All the Polypes are the same. They possess scattered 

 tentacles, and mature the sexual products on tentacular excres- 

 cences of the gastral wall. 



I. SUB-FAMILY CLAVIN^. Von Lendenfel, 1884. 

 Clavidse, with filiform tentacles. 



2. GENUS CLAVA. Gmelin. 

 With the characters of the family. 



4. CLAVA SIMPLEX. Nov. sp. 



Clava, with few scattered filiform tentacles, only 10 to 15 in 

 number, which taper slightly toward their terminal ends. The 

 club-shaped Polypes are about 1 mm. long and sit on 2-3 mm. 

 long stalks which rise from a creeping stolon, Polypes colourless. 

 The sexual products are matured in the lower part of the gastral 

 wall . 



At low water mark. 



Port Jackson. 



Clava simplex differs from the known species by its Hydro- 

 caulus, being well developed in this respect it resembles Tubiclava, 

 but it appears more natural to place our species under the genus 

 Clava, in consequence of its small size and the want of a chitinous 

 Perisarc on the Hydrocaulus. The Hydrocaulus of our Hydroid 

 is never branched as in Tubiclava. 



11. SUB-FAMILY CORYNIN^. Von Lendenfeld, 1S84. 

 Polyps with scattered capitate tentacles. 



No representatives of this group are known to occur in 

 Australian waters. 



3. FAMILY MYRIOTHELIM:. Allman, 1872. 

 Large solitary Polyps with numerous and dense scattered 



filiform tentacles, the sexual products are matured on tentacular 

 extensions of the gastral wall. 



No repi*esentatives of this Family are known to occur in 

 Australian waters. 



