FOSSILS FROM THE ENVIRONS OF TOKYO. 37 



p. 318. — Ll;r^clIKK, .lap. IMecres-Coucli., I., p. lo4, and III., p. 100. — 

 ÖCHRENXK, Mull. Aiuurl. and Nord-Jap. Meeres, p. 553. — Pilsbry, 

 Cat. Mar. Moll. Japan, p. 117.— Gould, Otia Conch., p. 163. 

 Synonym:— S. lithophagdla Da Costa; 5. elongata Bronx; S. rhom- 

 boïdes Poli; S. minutes Linxé; 5. prœcisus ^Ioxta(;u ; Mytilus 

 ritgosa Linnk ; M. pholadis Lixné. 



In the determination of this species the form of the shell, 

 the inequilateral state of the valves, and the imbrication on tlie 

 si])honal side can not be availed of; for, on comparing my speci- 

 mens with the figure in Wood's " Oraff 3Iollusca,'' I find that 

 in Wood's specimen the outer imbricating ridge (not imbrica- 

 tion), runs not along the posterior edge of the shell as in my 

 specimens, but leaves broad spaces between it and the posterior 

 edge ; also the surface of the shell in the English form is 

 furnished with many elevations and depressions. Some specimens 

 from the Grand Banks in Newfoundland and from Great 

 Britain, which are preserved in our Science College, are furnish- 

 ed not with ridges, but only with great elevations not so strongly 

 curved as in my specimens. 



Ta bat a (abundant). 



Miocene — Vienna (Vörslan, Garifahren, Enzesfeld, Pötzleins- 

 dorf, Grund, Grinzing, Steinbrun), Turin. 



Pliocene — Asti, Castel Anquanto, Messina, Belgium, Crag of 

 England (Cor. Crag — Sutton, Red Crag — Sutton, Walton Naze, 

 Cleyde Beds, Brindlington). 



Younger Tertiary — Sicily, Khodus, Ischia, Puzzabli, Chri- 

 stiana, Scandinavia, Australia. 



Diluvium — England, Canada, Sweden, Russia (Murman and 

 White Seas, and Nova Zembla). 



World wide in Recent time: 



Eukagawa and Susaki (Tokyo), Misaki (Sagami), Nanao 



