554 PROCEEDINGS OF THE ACADEMY OF [July, 



about at the anterior third. Anterior end a httle narrower than the 

 posterior, the margin sloping straight to the beak; the posterior upper 

 margin arcuate. No kmule or escutcheon are defined. The hgament 

 is deeply sunken and narrowly lanceolate. The interior is bright red- 

 dish-ochre colored in the cavity, white outside the pallial line. YsLlve 

 margins smooth. The hinge is rather broad, the teeth much like those 

 of Pilar citrina Lam. The pallial and muscle scars are but slightly 

 impressed. The pallial sinus small and ascending, extending a little 

 beyond the posterior third of the shell's length. 



Length 30.5, alt. 26.5, diam. 19.5 mm. 



Length 25.5, alt. 23, diam. IS mm. 



Fukm-a, Awaji. Types No. 82,135, A. N. S. P., from No. 1,297 of 

 Mr. Hirase's collection. 

 Tellina hirasei n. sp. PI. XLI, fig. 3. 



,Shell irregularly ovate, compressed, white and thin. Posterior end 

 tapering to a narrowly rounded termination, the anterior end longer 

 and broadly rounded; lower margin strongly arcuate, upper margins 

 nearly straightly sloping, the beaks very small and but slightly pro- 

 jecting. Sculpture of very fine low rounded simple radial riljlets, at 

 least twice the width of their narrow^ interstices, crossed by equally 

 spaced, thin, erect, minutely crimped concentric lamellar threads, about 

 one-half a mm. apart on the middle of the disk of the type specimen. 

 There is a slight radial ridge posteriorly, the surface of the valves being 

 elsewhere regularly convex. Interior white and glossy, very faintly 

 showing a very deep and wide pallial sinus, extending beyond the 

 middle of the shell, and partly confluent with the pallial line below. 

 In the right valve there are two delicate diverging cardinal teeth, 

 the ends overhanging the cavity, and strong, triangularly elevated 

 lateral teeth. The left valve has two cardinal teeth, the anterior one 

 vertical, slightly bifid, the posterior tooth very thin, and parallel to 

 the posterior dorsal slope. On each side the margin is raised into small 

 lamellae fitting above the lateral teeth of the other valve. The liga- 

 ment is narrow and oblique as usual. 



Length 18.5, alt. 13.6, diam. 7 mm. 



Hirado, Hizen. Type No. 86,268, A. N. S. P., from No. 1,524 of 

 Mr. Hirase's collection. 



This is an exquisitely sculptured shell, with more delicate concentric 

 lamellae than Semele exarata Ads. and Rve., a species curiously like it 

 in sculpture. It is apparently referable to the subgenus Pseudarco- 

 pagia of Bertin. It resembles Tellina corhis Bronn in sculpture and 

 to some extent in contour. 



