754 '• THETIS " SCIENTIFIC RESULTS. 



Range. — Maldive to the Philippine, Caroline and Solomon 

 Islands, south to Northern Australia. 



Remarks. — An examination of the type of Carpenter's Actino- 

 metra schlegelii at Leyden has shown me that it is the same thing 

 as his A. nohilis and A. regalis described seven years later. 

 Carpenter overlooked the curious characteristic arm structure in 

 the Leyden specimen, just as he did in the type of A. regalis, 

 though it is clearly depicted in his figure of the latter. I studied 

 the types of A. nobilis, A. regalis and A. dissimilis at London, and 

 find that they are identical with A. schlegelii and with A. nobilis. 



Subgenus COMANTHUS, A. H. Clark. 



Comanthus, 1908, A. H. Clark, Proc. Biol. Soc. Washington, 

 vol. 21, p. 220; Sinitlis. Miscell. Coll. (Quarterly Issue), vol. 

 52, p. 203 ; 1909, 7idensk., Medd. fraden naturhist, Foren- 

 ing i Kobenhavn, 1909, p. 142 (Comanthus intricata, A. 

 H. Clark, 1908). 



Specific group BENNETTIA, A. H. Clark. 



Bennettia, 1909, A. H. Clark, Vidensk. Medd. fra den naturhist. 



Forening i Kobenhavn, 1909, p. 142 (Alecto bennetti, J. 



Muller, 1841). 



Di_fferential Characters. — The cirri are always present and 



numerous, compressed distally, and usually stout, and the division 



series are, almost invariably, all 4(3 + 4). 



Range. — South-east Africa to Samoa, including the whole of 

 Australia and Tasmania, and northward to Ja{)aD. 



COMANTHUS (BENNETTIA) BENNETTI {J. Milller). 



Alecto bennetti, 1841, J. Muller, Archiv. fiir Naturgesch., 1841, i,, 

 p. 146 (Unknown). 



Actinometra hrachy niera, 1877, Liltken, Cat. Mus. Codeffroy, vol. 

 v., p. 100 {Port Denison ; Pelew Islands). 



Actinometra peronii, 1881, P. H. Carpenter, Notes from the Ley- 

 den Museum, vol. iii., p. 214 (Ceram). 



Actinometra bennetti, 1891, Hartlaub, Nova Acta Acad., vol. 58, 

 No. 1, p. 107 {Port Denison). 



Comanthns {Comanthus) bennetti, 1909, A. H. Clark, Vidensk. 

 Medd. fra den Naturhist. Forening i Kobenhavn, 1909, 

 p. 147. 

 Differential Characters. — This species is at once known by its 



very large number of arms, all the division series being 4 (3 + 4), 



