Fossils from the Upper Masashino of Kazusa and Shimosa. ]^37 



Shell moderately large, rather thin, transversely oblong, pretty 

 tumid, inequilateral, posterior side somewhat more than one and 

 a half times the length of the anterior, rounded in front, obliquely 

 subtruncate behind, antero-and postero-dorsal margins nearly 

 straight and somewhat sloping. Surface with rude lines of growth, 

 pretty uniformly convex except near the postero-dorsal margin 

 where it is somewhat flattened. Beaks small. Teeth two, obliquely 

 directed backward, with the posterior more so than the anterior 

 which is thick and short while the posterior is thin and long. 

 Muscular impressions more or less irregularly ovate, with the 

 posterior broader than the anterior. Palliai sinus large, finger-like, 

 horizontal aud deep, reaching almost to Ijelow the beak. 



The larger of the two specimens measures 80 millim. in length, 

 45 millim. in height and 13.5 millim. in deptli. 



This species closely resembles Psammobia maxima Desh. 

 (Reeve, Conch. Icon., Psammobia, sp. 4) from Panama which, 

 however, is more quadrate and more compressed. 



Fossil occurrence. — Shito. 



Genus SOI.ETEIXIKA, Blainville. 



211. Solefellitifi violneea, Lamarck. 

 PL IX. Figs. 13, 14. 



Soletellina violacea. Lamarck, Hist. Nat., Ed. II, vol. VI, p. 60. Delessert, ßeeueil, 

 pi. II, fig. 5. Lischke, Jap. Meerescoucb., vol. I, p. 131. Pilsbry, Cat , p. 122. 



Soletellina cumingiana. Deshayes, MSS. in Mas. Cami)ig. Eeeve, Conch. Icon., 

 Soletellina, pi. I, flg. 4. 



Psammobia violacea. Deshayes, in Encycl. Meth. Vers., Ill, p. 8.52. Philippi, Abbild., 

 I, p. 97. Psammobia, I, fig. 2. 



Solenotellina violncea. Dunker, Moll. Ind., p. 187. 



This transversely oblong flat shell rounded in front and 

 somewhat obliquely truncate behind is very numerous at some 

 localities. The violet tint of the living shell is more or less pre- 

 served also in the fossil. It must here be remarked that the fossil 

 specimens are somewhat shorter than the hving figured by Reeve, 

 the lengtli being not quite double the height. 



