ö Art. 5. — Matajiro Yokoyaina : 



found there. Therefore I immediately took up the examination of 

 the shells of the bed and was agreeably surprised to find them to l^e 

 such as can only be interpreted as Diluvial, not younger, not older; 

 for, although the thirty-five species'^ which I have been able to dis- 

 tinguish are all living, yet fourteen of them are now living only 

 south of Kyushu — in the China Sea, in the Philippines and the 

 tropical portions of tlie Pacific and Indian Oceans, etc. Such are 



1. Purpura alveolata Reeve. 



2. Cuma rugosa Born. 



3. Triton ohscurus Reeve. 



4. Cyprœa carneola Linné. 



5. Trochus atropurpureus Gould. 



6. Fissuridea rupellini Sowerby 



7. Cytherca tigrina Lamarck. 



8. Venus lacerai a Han ley. 



9. Venus cf. juhesi Deshayes. 

 10. Chama multisquamosa Gmelin. 

 IL Cardita cf. guhernaculnm Reeve. 



12. Area kraussi Philippi. 



13. Arcafusca Brugiere. 



14. Perna marsupium Lamarck. 



Of the remaining twenty-one species, fourteen are those living 

 in tropical as well as in Japanese seas, while only six are purely 

 Japanese. 



As to the corals which are found together with these shells, I 

 have not yet been able to determine their species; but this much 

 is certain that they are true reef-building corals belonging to such 

 genera as Ileliastraea, Cijpliastraea, Prionastraea, 3Iussa, Goniophora, 

 Stylophora, Alveopora, Domoseri^, Madrepora, several genera of 

 Fungidœ, etc., all which we do not find now living north of the 

 Ryukyus (the northernmost is 28" 20' N. Lat.) or of tlie Bonins 

 (about 27° N. Lat). 



From this we see that we have here a layer which corres- 

 ponds to the Diluvium of Europe. Just as the latter contains 

 many forms which have since retreated to the north, the Noma 



1) These will be described in a future number of this journal. 



