370 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



C. dorsalis, new species. 

 ('. macrolepis, new species. 

 C. cingulatus, new species. 

 (Subgenus Oxymacrurus Bleeker.) 

 C. acantholepis, new species. 

 C. carinifer, new species. 

 ('. smithi, new species. 

 0. radcliffei, new species. 

 V. weberi, new species. 

 Oxygadus, new subgenus. 

 0. spinifer, new species. 

 (Genus Hymenocephalus Giglioli.) 

 Hymenogadus, new subgenus. 



II. gracilis, new species. 

 (Subgenus Hymenocephalus.) 

 H. striatissimus aeger, new subspecies. 

 II. nascens, new species. 

 Papyrocephalus, new subgenus. 

 H. oarbatulus, new species. 

 MalacOcephalus Ittzonensis, new species. 

 Ventrifossa, new genus. 

 Atherodus, new subgenus. 

 Lucigadella, new subgenus. 

 Lucigadus, new subgenus. 

 Subgenus Ventrifossa. 



V. nigrodorsdlis, new species. 

 Y. diver gens, new species. 

 Lionurus infranudis, new species. 

 Lionurus evides, new species. 

 Lionurus decimalis, new species. 

 In addition to the systematic descriptions, we have prepared analyt- 

 ical keys to the species of several of the larger genera, each key 

 being the result of a study of the relationships throughout the world 

 of all the known species in the given genus. 



Methods of measuring and counting. — In order to insure greater 

 accuracy we have made large numbers of counts and measurements, 

 following generally the methods explained in our Japanese report, 1 

 but with certain minor alterations which are of quite evident nature. 



II. SOME RESULTS OF GENERAL BIOLOGICAL INTEREST. 



The present work has thrown some light on the biology of the 

 Coryphaenoididae, the family of fishes represented most abundantly 

 in the depths of the sea. 



1 Proc. U. S. Nat. Mus., vol. 51, 1916, pp. 147-148. 



