Fossils from tho Miiira Peninsula and its immediate North. 101 



Family Patellidae. 



Genus Helc ioitiseus, Dall. 



118. Helcioniscus pallidus, (Gould). 



Pl. VI. Figs. 16, 17. 



Helcionùcus pallida *, Pilsbry in. Tryon's Man. Conch., vol. XIII, p. 133, pl. 67, figs. 9, 10. 

 Catal. Mar. Moll. Japan, p. 112. 



Patella pallida, Godld, Proc. Bost. Soc. Nat. Hist., VII, p. 162. Dünkbr, Index Moll. 

 Mar. Jap., p. 156. Lischke, Jap. Meeresconch., I, p. 112. 



Patella lamanonii. Schrenck, Moll. d. Amurl. u. d. nordjap. Meeres, p. 303, pl. XIY, 

 figs. 6-9. 



There are several specimens which can be assigned to tins 

 species. The largest which is a little broken is 28 millim. long, 

 about 24 millim. broad and 17 millim. high, with about twenty- 

 two ribs at unequal distances and one to several interstitial riblets. 

 The position of the apex varies as in the living forms, being either 

 subcentral or more anterior. The shape is subovate to oval in 

 outline and high-conical, the slopes being straight or somewhat 

 convex. 



Fossil occurrence. — Miyata Zone (Kami-Miyata, Shimo- 

 Miyata and Motowada); Koshiba Zone (Koshiba). Upper Musa- 

 shino of Kazusa. 



Living. — ('entrai and Northern Japan. 



Class Scaphopoda. 

 Family Dentaliidae. 



Genus IPentaliutn, Linne. 



119. Dentalium complexum, Dat.l. 



Pl. VI. Fig. 27. 



Dejitalium complexum. Dall, Proc. U. S. Nat. Mus., XVII, 1895, p. 686, pl. 26, fig. 3. 

 Pilsbry in Trton's Man. Conch., vol. XVII, p. 76, pl. 20, fig. 35. Iwakawa, Cat. Jap. Moll. 

 Nat» Hist. Departm., Tokyo Imp. Museum, part I, p. 135. 



Shell thick, solid, only gently curved towards the apex, with 

 about forty round-topped, elevated longitudinal riblets which are 



