118 ELASMIAS. 



In the latter the columellar plate is oblong and distinctly bi- 

 dentate. The shells of E. luakahaense are much smaller, 

 lighter colored and thinner than those of E. fuscum. In adult 

 specimens the columellar plate is not as strongly developed 

 as in fuscum. In fresh specimens of E. luakahaense the shells 

 are covered with a whitish deposit. This character appears 

 to be lacking in E. fuscum and E. anceyanum. All the speci- 

 mens from Kaliuwaa are whitish-vitreous with a brown sum- 

 mit. 



In embryonic specimens (figs. 7, 8) the shell is globose; the 

 spire is shorter than in embryos of Tornatellina; the surface 

 is minutely marked with growth-stria? and is without raised 

 spiral striae; the parietal lamella is straight in section, about 

 a half a whorl in length ; the colurnella is vertical ; the colu- 

 mellar plate is oblong, narrow, with an almost straight inner 

 margin. 



A young specimen (fig. 10), at metaneanic stage, is 1.35 

 rani, in length and has slightly over 3 whorls. The parietal 

 lamella is very strongly developed, flaring outward and arcu- 

 ate in section ; the columellar plate is stronger than that of an 

 adult; there is a single short low basal palatal fold. 



In E. luakahaense the presence of palatal folds are not as 

 constant a character as in E. fuscum. In the young of some 

 colonies these folds are entirely absent, in others there may 

 be from one to three folds, while in a few colonies all the 

 young have three distinct folds one basal, a second just 

 below and a third just above the free edge of the parietal 

 lamella. Only about a third of the young from the type local- 

 ity have one or more palatal folds developed. 



3. E. ANCEYANUM n. sp. PI. 31, figs. 7, 8. 



Shell broad, ovately-conic, brownish corneous, thin, trans- 

 parent, glossy, nearly smooth, under a strong lens minutely 

 marked with growth-stride. Spire somewhat conic, with 

 slightly convex outlines, summit obtuse. Suture simple, im- 

 pressed. Whorls 41/2, convex, increasing rather rapidly, the 

 last subovate, rounded, with a convex base. Aperture large, 

 subovate, oblique. Parietal lamella small, erect. Columella 



