144 Proceedings of the Biological Society of Washington. 



Nominal Species included in the Genus. — Mquipinna, amhoinensis, 

 brevicuneata, conjungens, dividua, gyges, heliaster, imparipinna, klunzin- 

 geri, Isevicirra, lepida, leucomelas, occulta, ohelli, palmata, polyactinis, 

 protectus, reginse, scita, similis, subtilis and tenera. 



•">. Dichrometra A. II. Clark. 

 Dichrometra 1909. A. II. Clark, Proc. Biol. Soc. Wash., Vol. •_'•->, p. 12. 



Genotype.— Alecto flagellata J. Muller, 1841. 



Range. — Southeastern Africa and the Bay of Bengal to the Sunda Is- 

 lands, the Moluccas, New Guinea and the Pelew Islands, and northward 

 t<> southern Japan. 



Depth— 0-N4 fathoms. 



Nominal Species included in the Genus. — Afra, bimaculata, ciliata, 

 dbderleini, elongata, flagellata, pulcher, ttijlifer and tenuicirra. 



<;. Mariametra A. H. Clark. 



Mariametra 1909. A. II. Clark, Proc. Biol. Soc. Wash., Vol. 22, p. 144. 



Genotype. — Himerometra subcarinata A. H. Clark, 1908. 



Range.— From Great West Torres Island to Timor, the Macclesfield 

 Hank and southern Japan. 



Depth— 22-S4 fathoms. 



Nominal Species included in the (ieun.s. — Delicatissima, margaritifera , 

 subcarinata, tenuipes, tubercuJala and vicaria. 



Family MARIAMETRID^ A. H.Clark. 



Mariametrinx 1909. A. H. Ci.ark, Proc. Biol. Soc. Wash., Vol. 22, 

 p. 17(i. 



Range. — Indian and western Pacific Oceans; east Africa from Mada- 

 gascar and Zanzibar to Suez, and eastward, including the southern coast 

 of Asia and the northern coast of Australia, and the shores of all the 

 intervening islands, to New Caledonia, Fiji, Tonga, Samoa, the Hawaiian, 

 Marshall, Caroline and Pelew Islands, and southern Japan. 



Depth. — Littoral and sublittoral, ranging from the low tide mark (and 

 occasionally tide pools) down to 42 fathoms, and to 84 fathoms in south- 

 ern Japan. 



