Clark — A Revision of Tlmlassometridse and Himerometridas. 13 



Dichrometra articulata (J. Miiller) 



" bimaculata (P. H. Carpenter) 



" brevicuneata (P. H. Carpenter) 



" elongata (J. Miiller) 



" fiacjeUata (J. Miiller) 



" gracilipes (A. H. Clark) 



grandis (A. H. Clark) 



" ggges (Bell) 



" heliaster (A. H. Clark) 



" klunzingeri (Hartlaub) 



" marginata (P. H. Carpenter) 



" occulta (P. H. Carpenter) 



" okelli (Chadwick) 



" palmata (J. Miiller) 



" protectiis (Liitken) 



" regalis (P. H. Carpenter) 



" regime (Bell) 



" subcarinata (A. H. Clark) 



" subtilis (Hartlaub) 



" tenera (Hartlaub). 



The following species belonging to this family I have not been able to 

 place satisfactorily, through lack of material for comparison; the first 

 appears to be most closely related to Pontiometra andersoni , and the 

 diagnosis of that genus may have to be altered for its reception; the 

 second appears to represent a distinct generic type, for which the name 

 Oxymetra would be appropriate. 



Anttdon finscliii Hartlaub Antedon erinacea Hartlaub. 



Family THALASSOMETRID^. 



Sub-family THALASSOMETRIN.E. 

 KEY TO THE INCLITDED GENERA. 



a' Calyx and arm bases spinous, the latter rounded dorsally. 



b^ genital pinnules expanded ; brachials with single long overlapping 



median spines; P^ long, but not enlarged (12) Stylometra. 



6^ genital pinnules styliform, not expanded; brachials rounded dorsally ; 



spines when present on the brachials, two or more in number; Pj 



long and greatly enlarged (1))) Thalassometra. 



a' Calyx and arm bases smooth. 



6' I Br strongly carinate. 



c^ 1\ only slightly larger than Pj ; arms strongly carinate throughout 



(14) Stenometra. 

 c' Pi much longer than P.^ ; arms rounded, not carinate 



(15) Stiremetra. 

 V I Br not carinate. 



c' less than 30 cirrus joints; genital pinnules short; usually less than 

 twenty arms; lateral flattening of rays not marked 



(16) Parametra. 



