352 LAMINELLA, MOLOKAI. 



consists of spotless shells in which the yellow color becomes 

 much deeper on the last whorl, in some becoming deep chrome 

 behind the lip. Columella uniplicate (pi. 50, fig. 3). Other 

 shells are pale yellow, with more or less olive punctation or 

 streaking on the early whorls; 'Columella white, usually one- 

 folded but very strongly biplicate in one shell. In some shells 

 the last whorl is unusually swollen, others being normal in 

 shape. Length 17.8, diam. 9.8 mm. Length 19, diam. 9 mm. 



14&. L. CITRINA HELVINA Baldwin. PI. 50, figs. 12-15. 



11 Shell sinistral, imperf orate or subperf orate, sometimes 

 narrowly and deeply perforated, rather thin, elongately con- 

 ical, apex rather acute ; surface scarcely shining, covered with 

 very fine incremental striag; nuclear whorls smooth. Color 

 uniform light or dingy yellow, with a few black markings 

 on the upper whorls. Whorls 6%, lightly margined above, 

 convex; suture deeply impressed. Aperture a little oblique, 

 oval, white, with the tint of the outside; peristome simple, 

 thin, margins connected by a thin, orange-yellow callus ; colu- 

 mella biplicate, the 'terminal plication a thin, oblique lamellar 

 plait, the inner one less prominent, tortuous, of an orange- 

 yellow 'Color. Length 18, diam. 10 mm. 



* ' Animal extended in motion as long as the shell. Mantle 

 and foot above and below very light brown. Tentacles dark 

 slate, with a sprinkling of slate on the sides of the foot. Pos- 

 terior portion of foot very tapering and thickly studded with 

 minute red spots. A remarkably prolific species; 4 or 5 em- 

 bryonic shells in successive stages of growth often observed 

 ih the oviducts. A jaw is present and the dentition is the 

 same as that of the Amastra species. The tooth formula of 

 this species is 32.1.32 X 108 == 7,020. The central tooth is 

 a little wider than usual " (Baldwin). 



Molokai: Ohia valley, near Kaluaaha (Baldwin). 



Laminella helvina BALD., Proc. A. N. S., Phila., 1895, p. 

 227, pi. 11, f. 30 BORCHERDING, Zoologica, p. 91, pi. 8, f. 25. 



This shell is shaped like L. venusta, the last whorl being 

 more swollen than in typical citrina, though not more than 

 in some forms of that species. Typically it differs from 



