BY R. VON LEMDEXFELD, PH.D. 479 



23. GENUS. SCIURELLA Allraan. 



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 sym- 

 metrically disposed horn-like processes, and enclosing a ramified 

 blastostyle, the branches of which are in connection with moveable 

 Nematophores distributed over the surface of the gonangium. 



135. SCIURELLA INDIVISA. Allman. 



This Hydroid was dredged by the Challenger, off Somei-set 

 Island, Cape York, Torres Strait, in a depth of 5-10 fathoms and 

 has been described by Allman (1.) 



24. GENUS. ACANTHELLA. Allman. 



Hydrocladia pinnately disposed, bearing branches terminating 

 in simple jointed prolongations in which the places of the hydro- 

 cladia are taken by spinelike appendages. 



136. ACANTHELLA EFFUSA. Busk. 



This Hydroid was dredged by the Rattlesnake, in Torres Straits 

 off Cape York, and on reefs off Zamboanga, at a depth of 10 

 fathoms, by the Challenger (1.) It was described by Busk (2.) 



25. GENUS. HETEROPLON. Allman. 



Hydrocladia pinnate ; Hydrothecal Internode with the lateral 

 Nematophores moveable, and with a mesial fixed, spine-like Nema- 

 tophore below the Hydrotheca. 



(1.) G Ailman. Report on the Hydroida. The Zoology of the voyage 

 of H.M.S. Challenger, part XX., p. 26. 



(2.) G. Allman. Report on the Hydroida. The Zoology of the voyage 

 of H.M.S. Challenger, part XX., p. 27. 



(3 ) T. Busk. A voyage in H.M.S. Rattlesnake. Vol. I., p. 400. 



