ME. P. H. CAEPEXTEE OX THE GENUS ACTIXOMETEA. 



27 



species of Comatula described by Midler, who personally examined this collection. Last 

 autumn (1876) I was also able to examine it for myself, and thus to determine which 

 species should be removed from Midler's genus Alecto and transferred to Actinometra, in 

 the sense in which this name is understood by Dr. Liitken and myself. 



In the following scheme all those species to which no note of interrogation and the 

 name of no authority is attached, have been determined by myself as Actinometra^, i. e. 

 as having an excentric mouth and a terminal comb on tbe oral pinnules. 



With 10 arms. 



Actinometra. 



Second and third radial*; 

 united by a syzygy. <( 



Mouth radial. 



''Act. Solaris, Miill. 

 Act. pectinata, Miill. 

 Act. brachiolata. 

 Com. purpur a ? 1. 



I Com. rosea '.' 



y_Act. robusta, Liitken. 



Second and third radials f Com. eehinoptera ? -. 

 united hy ligaments -j 

 only. Mouth ? (_ Com. meritUonalis'? 3. 



With more 



than 10 



arms. 



Second and 



third radials 



united hy 



ligaments 



only. 



" 2 Distichals. 

 Axillary has no 



syzygy. 



<; 3 Distichals. 

 Axillary has a -^ 

 syzygy. 



3 palmars. 

 Axillary has a V Act. rotatoria, Midi. 4. 



syzygy- 



/(Act. polymorpha. 

 Mouth interradial. -< Act. trichovtera. 

 _ . 1 . 



2 palmars. ^| 

 Axillary has 

 no syzygy. 



^ Mouth radial 



'2 palmars. 



Axillary has 



a syzygy. 



3 palmars. 



axillary has a 



syzygy. 



[Act. Wahlberghii, Miill. 

 Act. finihriatn. 5. 



Act. multifi&a. <>. 



> Mouth interradial . Act. multiradiata. 



C Act. parvicirra. 7. 

 ■i Act. polymorpka. S. 

 [Act. Bennettii, Bohlsche. 9. 



Remarks. 



1. I have not personally examined either C. purpurea or C. rosea. Muller seemed to 

 think that the former might be a young condition of Act. Solaris 1 ; so that it is most pro- 

 bably a true Actinometra. C. rosea, however, presents a difficulty; for Muller says 

 expressly 2 that the first pinnules are uot specially distinguished; but, except in this 

 point, he regarded it as very closely related to C. brachiolata, which is a true Acti- 

 nometra. 



: Gattimg Comatula? p. 13. 



2 Ibid. p. 14. 



! :; 



