V. EXPLANATION OF THE PLATES. 



Plate I. 



Orbitoides (Lepidocyclina) angularis, sp. now, Form B. From Sonai, 



Iriometé Island, Yayeyama Group, Riü-Kiü. 



Fig. 1. — Horizontal section x 40. 



Fig. 6. — Vertical section x 35. 



? Linderina, sp. From same locality as above. 



Fig. 2. — Horizontal section x 60. 



Opercidina complanata, (Defrance). Found in an elevated coral-reef at 



Kamézu, south coast of Tokuno-shima between Okinawa and Oshima, 



Riü-Kiü. 



Fig. 3.— Side view x 2. 



Fig. 5. — Do nat. size. 



Orbitoidal Limestone of Sonai, Iriomoté Island, Yayeyama Group, Riü-Kiü. 



Fig. 4. — Section showing the small and crowded character 



of the organisms x 7. 



Orbitoides {Lepidocyclina) sumairensis, Brady. Form B. From the Or- 

 bitoidal limestone as above. 



Fig. 7. — Vertical section x GO. 



LitJiothamnium ramosissimwn, (Reuss). From same limestone and locality 



as before. 



Fig. 8. — Vertical section of a branch, showing the con- 

 centrically arranged layers of rectangular cells. 



