CLASS GASTROPODA 
211 
umbilicus, aperture rounded, simple, more or less patulous when mature; 
inner lip with a moderate coat of enamel continued on to the pillar lip and 
slightly reflected there; larger diameter, 9; shorter diameter, 5.5; height, 
3.5 mm. (Dali.) 
Type in United States National Museum, No. 219144. Type locality, 
Constantine Harbor, Amchitka, Aleutian Islands. 
Range. Amchitka and Middleton Islands, Alaska. 
Margarites helicina elevata Dali, 1919 
Proceedings of the United States National Museum, 56:366. 
Shell small, trochiform, polished, purple-brown, with a hard glassy 
nucleus and about five subsequent well-rounded whorls; suture distinct, 
rather deep; sculpture of evident incremental lines without any spiral 
striae; base rounded with a small umbilical chink; aperture simple rounded, 
slightly angular at the suture, the body with a well-marked glaze uniting 
the outer lips with a rather wide, white, slightly reflected pillar lip; oper¬ 
culum brownish with about 10 turns; larger diameter, 9; shorter diameter, 
7; height, 6.5 mm. (Dali.) 
Type in United States National Museum, No. 205833. Type locality, 
Bear Bay, Baranoff Island, Alaska. 
Range. Known only from type locality. 
Margarites beringensis Smith, 1899 
Plate 99, figs. 7, 8 
Proceedings of the Mplocological Society of London, 3:206, fig. 1. Dali, Bulletin 112, 
United States National Museum; PI. 16, figs. 5 and 6. 
Testa anguste umbilicata, depressa, olivaceo-lilacea vel pallide rufo- 
lilacea, nitida, lineis fncrementali obliquis curvatis sculpta; spira brevis ad 
apicem nigrescens; anfractus 5, celeriter accrescentes, perconvexi, sutura 
profunda sejuncti, ultimus magnus, paulo dilatatus, antice leviter descen- 
dens; apertura pulcherrime iridescens, subrotundata; peristoma haud con¬ 
tinuum, margine externo tenui, columellari incrassato, albo reflexo. Diam. 
maj., 11; min., 8.5; alt., 8 mm. (E. A. Smith.) 
Shell narrowly umbilicate, depressed, olive-lilac or reddish-lilac, pol¬ 
ished, sculptured with oblique curved lines of growth; spire short, turning 
black toward the apex; five whorls, increasing rapidly, very convex, divided 
by a profound suture, the last whorl large, in the rear dilated, in front 
[813] 
