242 LYROPUPA. 



West Maui: lao (type loc.), and Waikapu (Cooke) ; Hono- 

 kawai (Thaanum) ; Maunahoama (Forbes and Cooke) ; Hona- 

 kahua (Fleming). Type 11042 Bishop Museum; paratypes 

 38949 Bishop Museum and 119457 A. N. S. P. 



From L. r. lanaiensis it is separated by its more convex and 

 swollen whorls, lighter color and much more finely spirally 

 striate embryonic whorls. 



4. LYROPUPA THAANUMI C. & P., n. sp. PL 20, figs. 12, 13. 



The shell is sinistral, rimate-perforate, cylindrical, mars 

 brown, with a very indistinct, broad, pale zone just above the 

 periphery of the last whorl, chiefly visible on the ribs which 

 are there dirty white ; rather solid, opaque, dull. Sculpture of 

 strong ribs, 18 or 19 on the last whorl, the interstices with 

 minute, close, deciduous spiral striae, only visible with a strong 

 lens. Spire nearly cylindrical, with a rounded, blunt almost 

 truncate summit, the first two whorls nearly immersed in the 

 third ; last three whorls rather strongly convex, separated by a 

 deep narrow suture. Whorls 5y 2 , the embryonic iy 2 when 

 viewed under a strong lens (in adult specimens) are nearly 

 smooth though indistinctly spirally striate. The last whorl 

 ascends slightly near the aperture, tapering towards and con- 

 tracted at the base, furnished with a broad, shallow furrow 

 for a little more than half its length; the furrow bifurcates 

 indistinctly near its termination, the upper branch extending 

 to the margin of the lip. Aperture perpendicular, nearly 

 quadrangular in outline, with rounded corners, and base, the 

 peristome continuous, the inner half of the upper margin ap- 

 pressed to the penult whorl, the outer free. The angular 

 lamella is long, strong, its free edge slightly curved outwards, 

 extending to the outer margin of the aperture. Parietal 

 lamella strong, very deeply seated, bent outwards ; columellar 

 lamella very deeply and almost axially seated. Upper palatal 

 fold is long, high within, becoming low in front, emerging 

 nearly to the margin of the aperture. Lower palatal fold 

 very deeply seated and parallel to the upper, a little curved, 

 extending deeper than the upper palatal, and enlarged, nodule- 

 like, below the inner end of the latter. 



