Fossils from the Miura- Peninsula and its Immediate North. QQ 



114. Emarginula sp. 

 Pl. VI. Fig. 15. 



Two imperfect specimens of a depressed-conical shell, : 

 depressed but larger than the preceding species. The general 

 outline is ovate-oblong or elliptical, with somewhat posterior 

 recurved apex, and sculptured with alternately large and small 

 radiating riblets between which there may be still one or two finer 

 ones. The total number of large and small riblets may be about 

 sixty. There riblets are also crossed by very fine somewhat 

 distant concentric lines most distinct in the intercostellar spaces. 

 The anterior portion of the shell is broken in both specimens, 

 therefore the form of the slit and cicatrix are not known. One of 

 the specimens measures 6 millim. in height about 16 millim. in 

 length and 12 millim. in width. It seems to resemble Emarginula 

 costulata Desh. (Tryon's Manual, XII, pl. 41, figs. 12, 13) and 

 Emarginula puncticulata A. Ad. (Thesaur. , III., Emarginula fig. 

 14), but a strict comparison is not possible. 



Fossil occurrence. — Koshiba Zone (Koshiba). 



Family Acmaeidae. 



Genus Jictnœa, EsCHSCHOLTZ. 



115. Acmaea heroldi, (Dunker). 



Pl. VI. Fig. 12. 



Acmoea heroldi. Pilsbry, Cat. Mar. Moll. Japan., p. Ill, pl. VI, figs. 13-18. Lischke, Jap. 

 Meeresconch., JJ, p. 96. 



Patella heroldi. Dunker, Moll. Jap., p. 24, pl. Ill, fig. 13. 

 Patella pygmcea. Dünker, Moll. Jap., p. 24, pl. Dil, fig. 20. 

 Tectura heroldi. Dunker, Index Moll., p. 154. 



A small ovately elliptical shell, not very high, sculptured 

 with unequal riblets which are either close together, or more or 

 less separate. Vertex situated at the anterior fourth of the shell's' 

 length. The largest of our specimens measures 5 millim. in 

 height, about 12,5 millim. in length and 9 millim. in width. 

 Rare. 



