206 PROCEEDINGS OF THE ACADEMY OF [March, 



ribs, fully double the width of the interstices, closely and irregu- 

 larly crenulated by low concentric blunt, crowded laminae, which 

 on the later growth are obsolete in the grooves, but toward the beaks 

 are narrower and sharper, less crowded, and continuous across ribs 

 and intervals. Beaks full, projecting, curved forward. Lunule 

 heart-shaped, dark brown, ribbed and denned by a groove. Area 

 well sunken, ribless and. wide in the left valve, indistinct in the right. 



Anterior end short, rounded ; posterior end more broadly rounded. 

 Interior pure white, the right valve with three diverging cardinal 

 teeth, the posterior two grooved; left valve with two cardinals, 

 the anterior one slender, posterior stouter, shorter and deeply 

 grooved. 



Cavity of the beaks deep. Pallial sinus small, triangular, nar- 

 row and acute. Valve margins, except the hinge line, very 

 weaklv fluted and closely crenulate. 



Length 43, alt. 37.5, diam. 29 mm. 



Hirado, Hizen (Mr. Y. Hirase). 



This species resembles V. jedoensis Lischke, but has hardly 

 more than half as many, and stronger, ribs. There is a specimen 

 before me from Susaki, Awaji Island, besides several from the 

 type locality. 

 Tapes platyptycha n. sp. 



Shell oblong, compressed, the length somewhat exceeding 

 2| times the diameter; white, profusely marked with angular 

 red-brown reticulating lines grouped into triangular spots, or with 

 inverted V-shaped markings, and four radial series of brown 

 blotches alternating with white spots. Sculptured with concentric 

 ridges wider than their intervals, broad and flattened toward the 

 lower margin and especially posteriorly, fine and close toward the 

 beaks. Beaks low, yellow or purple, situated at about the ante- 

 rior fifth of the length, the dorsal margin behind them nearly 

 straight; posterior end obliquely truncate, bluntly regular at its 

 junction with the upper and basal margins. Anterior end short, 

 rather attenuated, much as in T. adspersa. Lunule narrow, indis- 

 tinctly defined by an impressed line, flattened, marked with some 

 oblique brown lines. Area depressed, transversely maculate with 

 groups of dark lines. Interior white, tinted with sulphur yellow 

 within the pallial line. Pallial sinus broad and rounded, not quite 

 reaching the middle of the length of the shell. Anterior cardinal 



