230 -^^t- !• — M- Yokoyama: 



which is an error). On these accounts, I separate the fossil as 

 a variety of the hving shelL 



Fossil occurrence. — Otake (frequent), Shisui, Shito. Oji and 

 Tabata in Masashi. 



Genus SPISUtâ, Gray. 



197. Spisnla t/ fay ana, (Schrenck). 



PI. VIII. Fig. 1, 2. 



Spisiila ijrayana. Pilsbry, Cat., p. 119. 



Mactra {Sjnsida) grayana. Schrenck, Moll. Amurl. u. d. nordjap. Meeres, p. 572. 



Mactra oralis. Eeeve, Concb. Icon., Mactra, pi. IX, fig. 86, 



Mactra poiide rosa. Philippi, Abbild., I, Mactra, p. 1 (165), pi. I, fig, 1. 



A rather thin, flatly convex, triangular shell Avith the 

 anterior side a little longer than the posterior. Both ends 

 rounded, much more sharply in front than behind. Surface 

 smooth, only with lines of growth. Palliai sinus deep, finger- 

 like, subtruncate or rounded at end. 



The following are the measurements of the two valves 

 flgured : 



Length. Height. Depth. 



Right valve 63.0millim. 45.2niillim. 11.9millim. 



Left „ 52.5 „ 38.3 „ 9.3 „ 



Fossil occurrence. — Shito (frequent). 



Living. — Northern Japan. Okhotsk Sea. Behring Sea. 

 Massachusetts. 



198. Spisulft bet'nardi Pilsbry. 

 PI. Vni. Fig. 3, 4. 



Spisula {Oxyperas) bernardi. Pilsbry, New Jap. Mar. Moll., Peleeypoda, Proc. Acad. 

 Nat. Sei. Phil., July, 1904, p. 550, pi. XXXIX, figs. 4-6. 



A. transversely elongated triangular shell almost tw^ice as 

 long as high. Surface concentrically grooved, although smooth 

 near the beaks. Lateral teeth normallv crenulate. 



