A MONOGRAPH OF THE EXISTING CIIINOIDS 33 



-.Dkhrometra, gen. nov. {genotype Alecto flagellata J. Miiilcr, 1841), including 



Dichrometra articulata. Dichrometra marginata. 



Dichrometra hiinaculata. Dichrometra occulta. 



Dichrometra brevicuneata . Dichrometra okelli. 



Dichrometra elongata. Dichrometra palmata. 



Dichrometra flagellata. Dichrometra jwotectus. 



Dichrometra gracilipes. Dichrometra regalis. 



Dichrometra grandis. Dichrometra reginae. 



Dichrometra gyges. Dichrometra subcarinata. 



Dichrometra heliaster. Dichrometra subtilis. 



Dichrometra klunzingeri. Dichrometra tenera. 



Two species are luiplaced: 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 spinijera. Stylometra, sp. 



Thalassometra, including 



Thalassometra agassizii. Thalassometra hawaiiensis. 



Thalassometra aster. Thalassometra midtispina. 



Thalassometra bispinosa. Thalassometra pergracilis. 



Thalassometra echinata. Thalassometra pubescens. 



Thalassometra gigantea. Thalassometra villosa. 



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

 including 



Stenometra conifera. Stenometra hana. 



Stenometra diadema. Stenometra quinquecostata. 



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

 including 



Stiremetra acutiradia. Stiremetra hreinradia. 



Stire metra spi n icirra . 



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



Parametra compressa. Parametra jisheri. 



Parametra orion. 

 97298—31—4 



