4 Art. 7. — M. Yokoyama : 



about 18°. The largest specimen measures some 56 millimetres in 

 height and 15 millim in diameter. 



This species is not unlike Turritella trisvleata Lam. (Try on' s 

 Conchology, vol. 8, pi. 63, fig. 75) living in the Red Sea, in 

 which, however, the arrangement of the three upper ridges is 

 somewhat different. 



A form close to this species was found in the Tertiary of 

 Götsu, Echigo. 



2. Natiea sp. 



A single imperfect fragment of a young shell resembling that 

 OÎ Natiea janthostoma Desh. (Yokoyama, Foss. Miura Penin., pi. 

 V, figs. 3, 4.). 



3. Dentaliiitn tveinliaitffi, Dunker. 



Dentaliiim iveinkaiiffi. Yokoyama, Foss. Miura Pen., p. 102, pi. VI, figs. 19-21. 

 Foss. Up. Musashino, p. 118, pi. YI, fig. 6. 



Only some fragments. 



4. Pholas fragilis^ Sowerby. 



Pholas frwjilis. Yokoyama, Foss. Miura Peuiu., p. 104, pi. YI, fig. 29. Foss. 

 Up. Musashino, p. 119. 



A right valve not quite perfect. 



.*>. JfostHia sp. 



A fragment not quite determinable. 



6. Meretrioe (Callista) chinensis, (Chemnitz). 



Meretnx {Callista) chinensis. Yokoyama, Foss. Miura Penin., p. 120, pi. YIII, 

 figs. 9, 10. Foss. Upper Musashino, p. 146, pi. XI, fig. 6. 



A small imperfect right valve. 



7. Sascidontus purparatus, (Sowebby). 



Saxidomus ])urpitratus. Yokoyama, Foss. Miura Penin., p. 127, pi. IX, fig. 8. 

 Foss. Up. Musashino, p. 153, pi. IX, figs. 4, 5. 



Two large specimens, though merely casts. 



