A MONOGRAPH OF THE EXISTING CEINOIDS 33 



Dichrometra, gen. nov. (genotype Alecto fagellata J. Muller, 1841), including 



Dichrometra articulata. Dichrometra marginata. 



Dichrometra bimaculata. Dichrometra occulta. 



Dichrometra brevicuneata. Dichrometra okelli. 



Dichrometra elongata. Dichrometra palmata. 



Dichrometra fiagellata. Dichrometra protectus. 



Dichrometra gracilipes. Dichrometra regalis. 



Dichrometra grandis. Dichrometra reginae. 



Dichrometra gyges. Dichrometra subcarinata. 



Dichrometra heliaster. Dichrometra subtilis. 



Dichrometra klunzingtri. Dichrometra tenera. 



Two species are unplaced: Antedon finschii Hartlaub, which appears to be most 

 closely related to Pontiometra andersoni and possibly congeneric with it, and Antedon 

 erinacea Hartlaub, which appears to represent a distinct generic type for which the 

 name Oxymetra is suggested. 



The family Thalassometridae is divided into the subfamilies Thalassometrinae 

 and Charitometrinae. The following genera and species are assigned to the Thalas- 

 sometrinae : 



Stylometra, including 



Stylometra spini/era. Stylometra, sp. 



Thalassometra, including 



Thalassometra agassizii. Thalassometra hawaiiensis. 



Thalassometra aster. Thalassometra multispina. 



Thalassometra bispinosa. Thalassometra pergracilis. 



Thalassometra echinata. Thalassometra pubescens. 



Thalassometra gigantea. Thalassometra villosa. 



Stenometra, gen. nov. (genotype Antedon quinquescostata P. H. Carpenter, 1888), 

 including 



Stenometra coni/era. Stenometra hana. 



Stenometra diadema. Stenometra nuinquecostata. 



Stiremetra, gen. nov. (genotype Antedon acutiradia P. H. Carpenter, 1888), 

 including 



Stiremetra acutiradia. Stiremetra breviradia. 



Stiremetra spinicirra. 



Parametra, gen. nov. (genotype Antedon orion A. H. Clark, 1907), including 



Parametra compressa. Parametra fisheri. 



Parametra orion. 

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