Fossils from the Mi lira Peninsula ami its Immediate North. Q3 



Fossil occurrence. — Miyata Zone (Okine in Nagai); Naga- 

 Ruma Zone (Naganuma)? Upper Musashino of Shimosa. 



Genus Turbonilla^ Eisso. 



88. Turbonilla (Cingulina) adamsi, Yokoyama. 



Pl. V. Fig. 17. 



Shell small, elongate-conic. Nuclear whorls planorboid, 

 standing on edge on the first whorl. Post-nuclear whorls about 

 ten in number, nearly flat and furnished with two deep spiral 

 grooves, dividing the surface into three unequal parts with the 

 uppermost narrowest and the low T est broadest. Body-whorl with a 

 third, somewhat less deep spiral groove at the periphery which is 

 bluntly angulate. Sutures deep. Aperture (fractured) subquadrate 

 in shape. 



The largest of a few specimens which we possess measures 

 7 millim. in height and 1.8 millim. in diameter. 



This species is very close to Turhonilla triarata Pilsbry (Proc. 

 Acad. Sei., Philad., Jan., 1904, p. 31, pl. V, fig. 48) living in 

 Japan; but the whorls are flatter and the grooves deeper, looking 

 in these respects more like T. cingulata Dunk, (ibid., pl. V, 

 fig. 47), also living in Japan, which has, however, three grooves 

 instead of two. 



•Fossil occurrence. — Naganuma Zone (Naganuma). 



89. Turbonilla (Chemnitzia) subapproximata, Yokoyama. 

 Pl. V. Fig. 18. 



Shell small, slender, subulate. Whorls many, flatly convex, 

 separated by deep sutures, longitudinally ribbed. Ribs elevated, 

 rounded, with about equal intercostal spaces, nearly straight, 

 reaching from the one suture to the other, ending at the rounded 

 periphery on the body-whorl, about sixteen on the penultimate 

 whorl. Base convex, smooth, with only faint indications of ribs 

 at the outer circumference. Aperture subquadrate, acute behind. 

 Outer lip thin. 



