1901.] NATURAL SCIENCES OF PHILADELPHIA. 207 



tooth in each valve compressed and simple, the middle one stouter, 

 bifid. 



Length 54, alt. 37, diam. 21 mm. 



Hirado, Hizen (Mr. Y. Hirase). 



This species stands near T. quadriradiata Desh., differing in the 

 coarser sculpture, more distinctly truncate posterior end, and de- 

 cidedly shallower pallial sinus. The color of the interior is also 

 different. T. deshayesii Hanley has a narrower and deeper pallial 

 sinus. 



Tapes phenax n. sp. 



Shell oblong, rather swollen, the diameter contained 2J- times in 

 the length; pale yellow, densely reticulated with angular reddish- 

 brown and purplish lines, darker in four wide rays, which are more 

 or less blotched with brown ; pale flesh- tinted or whitish toward 

 the beaks. Sculpture of fine, crowded, concentric rib-striae. 

 Beaks moderately prominent, at about the anterior fifth of the 

 shell's length. Dorsal margin moderately curved; posterior 

 end rounded; basal margin well arched ; anterior end short, 

 rounded. Lunule rather broadly lanceolate, defined by slight 

 grooves, dark, with irregular darker lines. Area lanceolate, 

 sunken, smooth, variegated. Interior white at the margins, ochre 

 or reddish-yellow in the cavity. Pallial sinus broad and deep, 

 reaching the middle of the shell's length or slightly past it. 



Length 46, alt. 31, diam. 20.5 mm. 



Loo Choo Islands (Mr. Y. Hirase). 



This handsome species is far more finely sculptured and more 

 inflated than T. quadriradiata Desh., but in my opinion it is the 

 form identified as quadriradiata by Roemer in his magnificent 

 monograph of Venus, Part 2, PI. 18, fig. 2. The crowded rib- 

 striae of the surface do not become wider on the lower and posterior 

 portions of the valves as they do in T. quadriradiata Desh., and 

 the posterior cardinal tooth of the right valve, while grooved at 

 the tip, is not broadly bifid as in Deshayes' species. 



DONACID.33. 

 Donaz 'kiusiuensis n. sp. 



Shell small, rather thin, white with one or two ill-defined ochra- 

 ceous rays, or yellow with some dusky concentric streaks, the beaks 

 brown-tipped; irregularly triangular, the length somewhat less 



