28 DESCRIPTIVE CATALOGUE OP THE 



24. Genus SCIURELLA. Allman. 



Hydrocladia not disposed in pinnae, but springing from many points round 

 the circumference of chord-like stems. Gonangia situated in the axils of the 

 hydrocladia, provided with symmetrically disposed horn-like processes, and 

 enclosing a ramified blastyle, the branches of which are in connection with 

 movable nematophores distributed over the surface of the gonangium. 



102. Sciurella indivisa. Allman. (7) 26, (94) 479. 

 North coast of Australia (Somerset Island). 



25. Genus ACANTHELLA. Allman. 



Hydroclaclia pinnately disposed, bearing branches terminating in simple 

 jointed prolongations in which the places of the hydrocladia are taken by 

 spine-like appendages. 



03. Acanthella effusa. Allman. (7) 27, (94) 479. 



Plumularia effusa (9) 129, (18) 400, (72) 46, (94) 473. 

 North coast of Australia (Torres Straits). 



26. Genus HETEROPLOK Allman. 



Hydrocladia pinnate, hydrothecal internocle, with the lateral nematophores 

 movable, and with a mesial fixed spine-like nematophore below the hyclrotheca. 



104. Heteroplon pluma. Allman. (7) 32, (94) 480. 

 South coast of Australia (Bass' Straits). 



27. Genus DIPLOCHEILUS. Allman. 



Hydrothecae, with a cluplicature of its walls, forming an external calycine 

 envelope, which surrounds the hydrothecpe for some distance behind the 

 orifice. Mesial nematophore in the form of a shield-like process not adnate to 

 the hydrothecse ; lateral nematophores absent. 



105. Diplocheilus mirabilis. Allman. (7) 49, (94) 485. 

 South coast of Australia (Bass' Straits). 



28. AGLAOPHENIA McCrady. 



Alimentary zooids and machopolyps form groups. The former in the 

 centre, two lateral anterior, and one mesial superior nematophore. Gonophores 

 in corbulce, or on modified pinnate. 



106. Aglaophenia brevicauiis. Kirchenpauer. (9) 171, (72) 41, (94) 484. 

 South coast of Australia (Port Phillip, Ballina). 



107. Aglaophenia ramulosa. Kirchenpauer. (9) 170, (72) 41, (94) 484. 

 East coast of Australia (Port Lincoln). 



108. Aglaophenia Macgillivrayi. Bale. (7) 34, (9) 170, (94) 484. 



Plumularia Macgillivrayi (18) 400. 

 Northern limit (Louisiade Archipelagus). 



