268 LYROPUPA. 



lated to L. ovai >(!<], but it differs by not having a distinctly 

 differentiated basal crest and especially by the internal struc- 

 ture of the palatal region. The tubercle below the inner 

 end of the upper palatal fold is of different shape, and the 

 lower palatal fold is a high and oblique lamina in L. plagiopti/.r. 

 a lower, diffuse tubercle in L. ovatnla. 



The locality is at the western end of the Waianae range. 



20. LYROPUPA CYBTA C. & P., n. sp. PL 23, tigs. 9, 10. 



The shell is stouter than L. perlonga, the outlines more con- 

 vex, the spire tapering more upwards. The whorls are regu- 

 larly and strongly convex, the last having only two sulci, and 

 these very shallow or even scarcely discernible. The ribs are 

 stronger than in perlonga, not flexuous, and number about 15 

 on the last, whorl. They pass over the narrowly rounded base. 



The lower palatal and basal folds are deeply placed, the 

 former a short, rather spreading callous tubercle, the latter 

 narrower and longer. Two strong tubercles stand beyond 

 their inner ends (pi. 25, tig. 15). 



Length 2.75, diam. 1.45, aperture 1 mm. ; 5VL> whorls. 



Hawaii: fossil at Mana, type loc., and Palihoukapapa (Hen- 

 shaw, Thaanum). 



This species resembles L. ovutula, but it is larger with far 

 less distinct sulci on the last whorl and no differentiated basal 

 crest, 



21. LYROPUPA cru.vxA (Dall). PL 25, figs. 13, 16, 17. 



"Shell pinkish brown, paler toward the apex, small, short, 

 stout, dextral, five-whorled, apex rather bluntly rounded, sides 

 subparallel, base full and rounded ; spiral sculpture of fine 

 striae, most prominent between the ribs on the last whorl and 

 obsolete on the early whorls; they do not overrun the ribs; 

 transverse sculpture of ( on the last whorl about twenty-five) 

 strong, sigmoid, squarish, narrow, elevated ribs, running from 

 suture to suture, and separated by much wider interspaces ; 

 these ribs are closer and finer toward the apex of the spire, 

 they resemble when best developed those of Pupa lyrain 

 Gould ; last whorl subconstricted before the aperture is 



