F> ssils from the Upper Musashino of Kaznsa and Shitjiosa. * WJ 



Fossil occurrence. — Shito. 

 Living. — Northern Japan. 



Genus EMARGINUI.A, Lamarck. 



174. Kttiargittula ratlososinuata, Yokoyama. 

 P]. VI. Fig. 5. 



Shell low-conic, thick, the apex recurved, situated at a little 

 less than the posterior third of the length of the shell. Sculpture 

 consisting of numerous rihlets latticed by elevated lines of growth. 

 Riblets unequal especially on the posterior slope where they are 

 alternately large and small. The riblets of the anterior portion of 

 the shell are more equal, although occasionally with a fine thread 

 between. Aperture somewhat elongate-oval, tapering in front. 

 Slit very shallow, looking like a slight notch. Slit-fasciole a little 

 elevated, ornamented with raised lamellse. Height 8 millim. Length 

 23 millini. Breadth 15 millim. Rare. 



This shell is like Subemarginula in having the sht shallow, 

 but the slit-band is elevated and distinct as in Emanjinula. 



Fossil occurrence. — Shito. 



Family Palellid«. 



Genus If ELCIOXISCIIS, Dall. 



17.">. Hele ionise 9t.s pallid ns, (Gould). 



Helcionificiis pallidus. Pilsbry in Tryon's Man. Concli , XIII, p. 138, pi. G7, tigs. 9, 10. 



Catalogue, p. 112. Yokoyama, Foss ^Ji\u•a Penin., p. 101, pi. YI, figs. 10,17. 

 Patella pallida, (lould, Proc. Bost. See. Nat. Hist., YII, p. 162. Danker, IikI Moll, 



p. 156. Lischke, Jap. Meeresconcb., I, p. 112. 

 Patella lamanunU. Sclirenck, Moll. d. Amnrl. u. d. nordjap. Meeres, p. 303, pi. XIV, 



figs. 6-9. 



A single specimen. This species has already been described 

 from the Lower Musashino in my work above quoted. 



Fossil occurrence. — Shito. Lower Musashino of Miyata and 

 Kosliiba. 



Living. — Northern and Central Japan. 



