552 PROCEEDINGS OF THE ACADEMY OF [July, 



adductor scar, anteriorly. The anterior margin is finely crenulated 

 from the beaks down, and along the basal margin, the posterior end 

 being without internal crenulation. 



Length 51, alt. 43, diam. 32 mm. 



Hirado, Hizen. Type No. 86,299, A. N. S. P., from No. 1,511 of 

 Mr. Hirase's collection. 



This is a less ponderous species than either Cylherea puerpera or C. 

 reticulata, the radial riblets are more numerous and the concentric 

 lamellse thinner and higher than in either, and quite different in sculp- 

 ture. The hinge and teeth, while of the same type, are decidedly 

 more delicate. I rank the form as a variety of Venus crispata Desh. 

 (P. Z. S., 1853, p. 2, No. 8), but the lamellae of that species are stated 

 to be "Hi medio et ad margines crassioribus , inflexus," terms hardly 

 applicable to the present species. The description of the interior — 

 "valvis intus in fornice croceis; sinu pallii latissimo, profunda" — is also 

 at variance with the specimens before me. 

 Chione micra n. sp. PI. XLI, figs. 4, 5. 



Shell minute, oval, moderately thick, cream-white, some or all of the 

 ribs stained with light reddish-brown. Beaks small, at about the an- 

 terior third. Lunule cordate, not distinctly defined, escutcheon lanceo- 

 late, slight!}^ excavated. Ligament immersed, short and lanceolate. 

 Sculpture of radial, rounded ribs, 18-20 in number, of wdiich three are 

 on the lunule. The ribs are wider near the anterior end, where several 

 of them are flattened and divided by a median groove, and in the inter- 

 vals of these bifid ribs a minute riblet is interposed near the lower 

 margin. Elsewhere the intervals are about as wide as the ribs. The 

 concentric riblets are low in the intervals, but on the ribs they rise as 

 erect flat scales. The interior is livid -whitish in the cavity, the muscle- 

 impressions, pallial sinus and space below the pallial line being purple- 

 brown, fading to white at the edge. The pallial sinus is short and 

 ascending, round at the end. Both ends and the ventral margin are 

 minutely crenulate within, and the margin within the lunule has very 

 fine crenulations nearly parallel to the long axis of the shell. In the 

 left valve the anterior and posterior cardinal teeth are simple, the 

 median one bifid, the posterior tooth being very thin. The right valve 

 has a bifid median cardinal, simple ones on each side, the anterior tooth 

 very thin. 



Length 5.6, alt. 5, diam 3 mm. 



Hirado, Hizen. Types No. 80,583, A. N. S. P., from No. 1,209 of Mr. 

 Hirase's collection. 



I have had these minute shells for several years without being able 



