dossils from tin- Miura Peninsula and its [uiinediate North, 29 



but in our specimens from Mukubatake, (Kami-Miyata), they are 

 also found in a region between, although so faint as to require a 

 powerful lens and ;i good illumination to see them. Yamakwna 

 mentions Retusa phiala A. Adams, Retusa coelata Bush, Retusa 

 ovata -Ii.i'i'i:. and Cylichnà pyramidata A. Adams among the recenl 

 species as more or less allied to the present one. The specimens 

 are rather rare. 



Kossil occurrence: — Miyata Zono (Muköbatake in Kami- 

 Mivata, and Nagai); Naganuma Zone (Naganuma); Upper IVEusa- 

 shino of Musashi. 



6. Cylichna yamakawai, Yokoyama. 

 Pl. I. Flg. 7. 



Bullinella striata. ïamakawa, Dcscript. lAissil Opistholir. Japan, Journ. Geol. Soc. TokyOj 

 vol. XVIII, May, 1911, p. 51, pl. XI, figs. 37-38. 



Yamakawa gives, the diagnosis of his Bullinella striata as 

 follows: 



"Shell small, thin, cylindrical, short, convolute, slightly 

 compressed in the middle; anterior and posterior ends rounded ; 

 surface with obtuse lines of growth and transverse sirialions, the 

 latter being very line, ra! her distant and somewhat more indistinct 

 in the anterior than in the posterior part of the shell; vertex 

 neither depressed nor perforated ; aperture entire, narrowed in the 

 posterior portion, widened in the anterior, the widening beginning 

 at two-fifths the length from the bottom; lip thin, straighl behind, 

 curved in front. Beight 2,8 millim. Diameter L,5 millim." 



Of the two specimens obtained at Yokosuka, one measures 

 nearly '•> millim. in length. 



Fossil occurrence: — ;Yokosuka Zone (Yokosuka between 

 Shioiri and Sakamoto); Upper Musashino of Shimo-Suyeyoshi and 

 of Dokwanyama, both near Tokyo. 



The specific name striata was changed into Yamakawai, as I 

 do not recognize the distinction of Bullinella from Cylichna, in 

 which case striata is a name already preoccupied by Jeffreys 

 (Ann. Mag. Nat. Hist. (4) XX, p. t92). 



