378 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



D. THE EAST COAST OF LUZON. 



In the Philippine subregion, already discussed, we find among 40 

 species present only two species which occur also in Japan. On 

 the east coast of Luzon, however, out of a total of but 20 species 

 known to inhabit that region 5 species are also found in Japan. 

 Of these five species but one or two * occur in the East Indies and 

 none belong to the fauna of the Philippine subregion. The 

 typical Japanese subspecies of Hymenocephalus striatissvmus 

 ranges southward to eastern Luzon, but is exclusively represented 

 in the Philippine subregion by II. s. torvus. The most remarkable 

 of all Macrouroid fishes, Macrouroides inflaticeps, which is known 

 only from the type dredged off eastern Luzon, finds its sole ally in 

 Squalogadus modiftcatus of Japan. The four species which range 

 from the East Indies as far north as northern Luzon occur on both 

 coasts of that island. Of the 10 remaining species of eastern Luzon, 

 6 are found also both in the Philippine and the East Indian sub- 

 regions, while one specimen each of 4 species were obtained, two of 

 which are characteristic of the Philippine subregion, one is charac- 

 teristic of the East Indian subregion, and a fourth is known else- 

 where only from northern Luzon. 



E. NORTHERN AND NORTH WESTERN LUZON. 



The seven species known from this region show the following 

 relationships : 



1. Coryphacnoides microps, known also from southeastern Luzon. 



2. Coelorhynchus dorsalis, unknown elsewhere, but representing 

 the C. notatus group of the Philippine and East Indian subregions. 



3. Coelorhynchus cingulatus, a very distinct species known also 

 from Formosa. 



4. Coelorhynchus weberi, more closely related to C. productus and 

 C. anatirostris of Japan than to any of the numerous species occur- 

 ring to the southward. 



5. Hymenocephalus striatissimus, intergrades between H. s. stria- 

 tissimus of Japan, Formosa, and eastern Luzon, and II. s. torvus of 

 the Philippine subregion. 2 



6 and 7. Hymenocephalus longiceps and Ventrifossa diver gens, 

 known throughout the region both to the northward and the south- 

 ward. 



F. FORMOSA. 



In addition to C oclorhynchus cingulatus and to Hymenocephalus 

 s. striatissimus, discussed in the preceding section, there are known 

 from about Formosa but two species, Hymenocephalus longiceps and 

 Ventrifossa nigrodorsalis, species of wide range to the southward. 



1 Bathygadua viiiltifil-is and perhaps CoelorTiynchm paraUehis. 



2 One specimen of Malacorephalus Uieonensis was obtained off western Luzon within the 

 range of these intergrades. 



