BELONGING TO THE GENERA FI LIGELLA AND ACIS. 15 



Taking into consideration the above facts, this genus shall 

 have to be diagnosed as follows : 



Colony branched in one plane. Polyps arranged in two 

 rows in the plane of the branching, or around the stem and 

 branches, or only on their anterior surface. Calyces usually 

 low, conical, armed with scaly spicules, sometimes arranged in more 

 or less regular longitudinal and transverse rows. Anthocodia re- 

 tractile into the calyces, with operculum composed of curved, club- 

 like or fusiform, sometimes very flat spicules set en chevron, and 

 of a collaret formed of spicules arranged in single or double 

 rows. Cœnenchyma with enormous spicules or scales arranged 

 in a single layer and slightly overlapping or touching one another 

 by their sides. 



Zoological Laboratory, 



Tokyo Imperial University, 

 April 20, 1909. 



Literature. 



1860 DucHASSAiNG et MiCHELOTTi : Mémoire sur les coralliaires des 

 Antilles. Turin. 



1864 DucHASSAmG et Michesotti : Supplement au mémoire sur les 

 coralliaires des Antilles. Turin. 



1864 KÖLLIKER : Icônes Histologicte oder Atlas der vergleichenden Ge- 

 webelehre. Leipzig. 



18G8 Gray : Descriptions of some new Genera and Species of Alcyonoid 



