1 6 New Species of Aviastra. 



Columella very sleuder, furnished with a low oblique fold. 



Length 13.4. diam. 6.9, apert. 6.0 mm. ; 6 whls. (Holotype) 

 " 14-3, " 6.9, " 6.4 " 6 " 

 13.3, " 6.2, •' 5.7 " 6 " 



Hawaii: Waikii station, land of Waikoloa about 6,000 feet 

 elevation. 



Holot^'pes and cotypes No. 41,967, paratypes No. 41,968, 

 Bishop Museum. 



This variety differs from conica by its less convex whorls and 

 absence of a perforation ; from \^x. gyrans it differs by its thicker 

 shell and less convex whorls, especiall}' those of the embryonic 

 stage . It is easily separated from var . kohalensis by the less convex 

 outlines of its spire, shallower sutures, longer and proportionally 

 narrower aperture, more solid shell and absence of a perforation. 

 The supersutural keel of the penultimate whorl is not as strongly 

 developed \\\ gentilis as in A. conica and its two varieties. In an 

 immature specimen of five and one half whorls, this keel is repre- 

 sented as a rather faint raised line. 



A. spicula, n. sp. 



PI. A. Fig. 2. 



The shell is imperforate or minutely perforate, ovate-conic, 

 solid. In its fossil state of a glossy whitish color. The spire is 

 conic with slightly convex outlines, contracted above. The em- 

 bryonic whorls are almost flat, uniformh- minutely striate; the 

 third and fourth whorls are slightly more convex, more coarsely 

 and less regularly striate with growth-wrinkles, the penultimate 

 whorl is ver}' irregularly striate with faint revolving striae above 

 graduall}^ becoming malleate below. The last whorl is maleate 

 with a distinct angle just above the periphery, the angle being 

 continued just above the sutures of the fourth and fifth whorls. 

 The aperture is rather large with a strongly cun'ed outer margin. 

 The columella is very narrow and slender, the upper portion of its 

 outer margin being appressed to the shell. The columellar fold 

 is rather weak, oblique, terminating rather abruptly _near the 

 margin of the columella. 



Length 17.5, diam. 10.4, apert. 8.3 mm.; 6^-^ whls. (Holotype) 



" 16.8, " 9.2, " 7.9 " 6>4 " 



" 18.9, " lo.i, " 8.5 " 7 

 [234J 



