JAPANESE MOLLUSKS, LITTORINID^E. 63 



Lacuna (Epheria) lepidula Ad. Ann. Mag., 1863, XI, p. 350. 

 Seto-Uchi, Akasi, 15 fms. (Ad.). 



Lacuna unicarinata E. A. Smith. Ann. Mag., 1875, Vol. XVI, p. 104. 

 North Japan, on a littoral species of Sargassuin (St. John). 



Lacuna (Cithna) globosa A. Ad. P. Z. S., 1863, p. 113. 



Seto-Uchi, Harima Nado (Ad.). 

 Lacuna (Cithna) spirata A. Ad. L- c., same localities. 

 Lacuna oxytropis Pilsbry. PI. VIII, fig. 1. 



Shell acutely turbinate, rather thin, widely umbilicated, yellow- 

 ish-brown, becoming olive on the spire ; surface covered with a thin 

 epidermis, sculptured by slight fine growth-lines only. Spire elevated, 

 acute ; whorls 4 , convex, separated by deep sutures, the last whorl 

 with an acute pinched peripheral keel, which becomes obsolete at 

 aperture, but extends up the spire immediately above the sutures. 

 Aperture half round, outer lip well curved, inner lip about straight, 

 retracted in the middle, thin ; umbilicus rather large and deep, ex- 

 cavated, brown, and rather roughly longitudinally striate within, 

 bounded by a very acute keel. Alt. 6, diam. 5 mm. ; apert. ob- 

 lique alt. 4, width 3'7 mm. 



Tokyo Harbor (F. Stearns). 



Lacuna smithii Pilsbry. PI. VIII, fig. 2. 



Shell ovate, smooth, yellow, with white or white-edged apical 

 whorls, and usually a white peripheral band ; surface marked by 

 growth-lines and some irregular wrinkles. Spire elevated but ex- 

 tremely obtuse; whorls 4, the latter 1? demarked from the preced- 

 ing by a dark line, the earlier whorls forming a depressed-globose, 

 low-spired embryonic shell. Last whorl keeled at periphery, the 

 keel becoming obsolete toward the lip, not visible on the whorls of 

 the spire. Aperture oblique-ovate, inner lip arcuate and retracted 

 in the middle ; umbilicus moderate, pure white, deeply penetrating, 

 surrounded by a very acute brown keel, excavated within. Alt. 5*6, 

 diam. 4'2 mm. ; aperture, oblique alt. 3'6, width 2*5 mm. 



Tokyo Harbor (Stearns). 



A very obtuse shell, less transversely inflated than L. stenotomor- 

 pha and with narrower umbilicus. This species is named in honor 

 of Mr. E. A. Smith, whose contributions to our knowledge of Japan- 

 ese shells have been of great extent and value. 



