LEPTACHATINA, GROUP E. 19 



same number of whorls, the outlines are slightly more con- 

 vex, the apex is more acute and the columellar fold is slightly 

 stronger and more oblique. All of the shells of Gulick's 

 species that I have been able to examine are minutely per- 

 forate, while those of Pease were imperf orate. One of the 

 specimens received from Pease is figured. 



22. L. CONVEXIUSCULA Sykes. PI. 9, figs. 1, 2, 5. 



"Shell turrited, elongate, slender, somewhat thin, dextral, 

 brownish corneous, smooth, polished, glossy, apex somewhat 

 obtuse ; whorls G 1 /^, convex, somewhat swollen, the last equal 

 to 9/16 of the length of the shell; suture well impressed; 

 aperture pyriform, sinuate at the margin of the columella, 

 furnished with a very small fold, with the margins united -by 

 a very thin callus. Length 8.0, diam. 2.8 mm." (Sykes}. 



Oahu: Waiolani (Perkins) ; Nuuanu, Palolo (Cooke). 



Leptacliatina. convexiuscula SYKES, Fauna Hawaiiensis, ii, 

 1900, p. 360. pi. xi, fig. 11. 



"A shell of the group of L. exilis Gulick, but with more in- 

 flated whorls, slightly more tapering towards the apex, and 

 the mouth more drawn out to the right." (Sykes}. Fig. 5 

 is a copy of the original figure. Figs. 1, 2 are from Nuuanu 

 specimens. 



L. convexiuscula is about midway between L. cylindrata 

 Pse., from Kauai, and L. exilis Gulick. There are two color 

 varieties among the specimens from Nuuanu. The more 

 abundant form is brownish corneous, the other vitreous and 

 diaphanous. The specimens from Palolo are slightly more 

 slender than those from Nuuanu, the upper whorls of the 

 spire are more attenuate, more closely coiled and slightly 

 more convex ; the aperture is also narrower. 



Two shells from the additional localities have the follow- 

 ing measurements: Length 8.9, diam. 2.9, alt. of apert. 3.2 

 mm., 6% whorls (Nuuanu). Length 9.0, diam. 2.7, alt. of 

 apert. 3.2 mm., 7 whorls (Palolo). 



23. L. EXILIS (Gulick). PI. 9, figs. 6, 10. 



"Shell dextral, subperf orate, cylindrically turreted, slen- 



