l\Q Art. 1. — M. Yokoyama : 



sides, very narrow in front, gradually becoming broader toward 

 behind where it is broadly rounded, having the length a little 

 greater than one-third that of the shell. Peristome horizontal 

 laterally, curved up both in front and behind, less so in the former 

 than in the latter. 



Two specimens. The larger shows the following dimensions: 

 Length 15.5 milhm. ; breadth 8 millim. ; height 4.2 millim. ; length 

 of hole 5.5 millim. By comparing it Avith the tj^pical specimens of 

 this species (Pilsbry's Cat-, p. 107 and Tryon's Man. Conch., XII, 

 p. 190, pi. 59, figs. 56-59), the shell is somewhat shorter, and in 

 outline more like Macroschisma //'scMei Pilsbry (Cat. , p. 108, pi. VI, 

 figs. 1-5) which, however, differs from the fossil in many minor 

 points. 



Fossil occurrence. — Otake, Tega. Lower Musashino of Yoko- 

 suka (typical form). 



Living. — The typical form of the species liA-es in Central Japan, 

 China, and Singapore. 



Genus PUMC'TlTREttA, Lowe. 



ITil. PuiietureUa nobilis, (A. Adams). 

 PL VI. Fig. 4. 



PmtctiireUa nobilis. Vilshi-j, Csitsilogue, ^. 109. In Tryon's Man. Conch., XII, p. 231, 



pi. 63, figs. 34-37. 

 Cemoria nobilis, A. Adams in Sowerby's Thes. ConcL., Ill, p. 208, figs, 6-9. Sowerby in 



Eeeve's Conch. Icon., XIX, fig. 6. Danker, Index Moll., p. 154. 



A. Adams gives the description of this species as follows: 

 "Elevated-conical, vertex acuminate, inclined, acute; radiating 

 ribs strong, equidistant; interstices concentrically striated. Fissure 

 narrow, lanceolate. Margin deeply crenulated. Resembling 

 Cemoria cucullata Gould, but with the ribs stronger, wider apart 

 and equal; the apex moreover is considerably more elevated and 

 acute." 



Two specimens, the larger of which is only a fragment. The ■ 

 other which is 7 millim. long, 6 millim. broad and 5 millim. high, 

 has about nineteen radiating ribs between which there is always a . 

 weaker interstitial not attaining the apex. 



