ELASMIAS. 119 



slightly twisted; columellar plate almost vertical, narrowly 

 rectilinear, with its inner margin nearly straight. Outer lip 

 thin, convex. Length 3.1, diam. 1.7, length of aperture 1.4 

 mm. 



West Maui: Maunahooma (Cooke). Type no 14147, B. P. 

 Bishop Museum coll. 



From E. fuscum this species differs in the thinness of its 

 shell and in its much smaller parietal lamella and columellar 

 plate. From luakahaense it differs in size, form of the shell, 

 and its much smaller parietal lamella and columellar plate. 



A young specimen (at the metaneanic stage), from the type 

 lot, is 1.7 mm. in length and has 3y 2 whorls. The parietal 

 lamella is very strong, flaring outward. The columellar plate 

 is strong, triangular in outline, its margin is twisted, thick- 

 ened, with the thickening continued along the base, and form- 

 ing a rather prominent tooth at the inner basal angle of the 

 columellar plate. With further development the apertural 

 armature becomes less prominent, being noticeably decadent 

 in the adult stage. No palatal laminae have been observed in 

 a large series of the young of this species. 



Polynesian species. 

 4. E. OVATUM (Anton). PL 30, fig. 1. 



Oval ventricose ; 3 ventricose whorls, with deep suture, last 

 whorl two-thirds the whole ; apex obtuse ; aperture oval, with 

 two lamellae on the columella, the lower broadly curved 

 around. Breadth 1, height iy 2 lines (Anton). 



The small shell is ovate, rather ventricose, glossy, very finely 

 striate with growth-lines, nearly transparent, corneous-yellow ; 

 the spire short, somewhat turrited, obtuse; the 3^ whorls 

 are moderately high, convex, united by a simple, somewhat 

 Impressed, suture, which is the more distinct because of the 

 nearly flat upper surface [of the whorls] ; last whorl is ven- 

 tricose, scarcely two-thirds the total length, rounded below. 

 The aperture is narrowly half-ovate; on the parietal wall 

 there is a short, very thin, broadly projecting, somewhat ob- 

 lique white plate; on the columella an equally strongly-pro- 



