152 AMASTRA, KAUAI. 



outer lip and a white patch around the perforation. Con- 

 fined to Kauai, but closely related to forms of Oahu and 

 Hawaii. 



6. A. RUGULOSA Pease. PI. 15, fig. 12. 



"Shell ovate-conic, thick, rimate, obliquely wrinkle-striat- 

 ulate, covered with a rough brown epidermis, chestnut-colored 

 beneath the epidermis, whitish at the lip-edge and around the 

 base, the apex blackish. Whorls 6, convex, sometimes a little 

 inflated. Suture impressed. Aperture ovate, vertical. Colu- 

 mellar fold strong, callous, compressed, almost transverse. 

 Lip thickened. Length 12, diam. 9 mm." (Pse.) . 



Kauai (Pease): Kapaa (Baldwin); Lihue (Perkins). 

 Type in Mus. Comp. Zool. 



Amastra rugulosa PEASE, Journ. de Conchyl., xviii, 1870, p. 

 95. BALDWIN, Catalogue, p. 10. SYKES, Fauna Hawaiiensis, 

 p. 354. Achatmella (Amastra) rugulosa Pse., CROSSE, J. de 

 C., xxiv, 1876, p. 99, pi. 1, f. 4, 4a. HARTMAN, Proc. A. N. S. 

 Phila., 1888, p. 49 ("Kula, East Maui"). 



This species is decidedly more roughly sculptured than A. 

 nucleola, more obese, the whorls are more convex, and the 

 columellar lamella is stronger. It is very much like A. sphce- 

 rica in texture and color, but that is a shorter shell with a 

 larger umbilicus and no basal white area. The outlines of 

 the spire, while nearly straight, are perceptibly though weakly 

 convex below and concave above. The sculpture, at the early 

 stage, is like that described for nucleola. Whorls 5% to 5%, 

 the first brown or purplish-brown (not blackish, as Pease 

 states). The last whorl has rough, uneven striaB, but no 

 spiral lines. It has a white area at the base, and a narrow 

 streak behind the lip is white or whitish. The aperture is 

 brown inside, but there is a narrow white rim within the ob- 

 tuse lip. Columellar fold quite strong. There is an axial 

 perforation, half closed by the columellar lip. Two specimens 

 of the original lot, received from Mr. Pease, have been exam- 

 ined, one being figured (fig. 12). 



Length 12, diam. 8.2 mm. ; aperture length 6 mm. 



Length 11.5, diam. 8.1 mm. ; aperture length 6 mm. 



