LYROPUPA. 245 



blunter summit together with the distribution on a different 

 island incline us to separate it specifically. 



6. LYROPUPA CLATHRATULA Ancey. PI. 21, figs. 1. 



"Shell sinistral, oblong, riniate-perforate, opaque, with a 

 somewhat silky sheen, deep purplish-black, unicolorous, some- 

 what thin ; sculptured, except on the apex, with acute, oblique, 

 equidistant lamella-like lirse (12 on the last whorl) ; in addition 

 encircled and slightly clathratulate in the interstices with very 

 slightly prominent elevated membranous lines, especially 011 

 the last two whorls. Spire ovate, obtuse. Whorls 5, convex, 

 separated by an impressed suture, under a strong lens marked 

 with lines of growth, the last furnished near the aperture with 

 a, not very distinct impression parallel to the suture, scarcely 

 angulate about the umbilicus, ovate, a. little tapering. Aper- 

 ture suboblique, appressed, irregularly ovate, externally angu- 

 late above, obstructed by 5 lamella? or plica?, namely : 2 parietal 

 lamella?, one of which [parietal) is submedian, free, and the 

 second shorter, more externally seated, united with the margin : 

 a deeply seated semilunate columellar, visible when viewed 

 obliquely; 2 long palatal, the upper almost reaching the mar- 

 gin, the lower more deeply seated, corresponding to the shal- 

 low, external sulcus. Peristome slightly expanded, purplish- 

 brown, with the margins approaching above, but hardly con- 

 tinuous. Length 2.25, diam. 1.5 mm." (Ancey). 



Hawaii: Olaa (Thaanum). Type 18742, paratypes 18768 

 Bishop Museum, 119436 A. N. S. P. and Thaanum coll. 



Lyropupa clothratula ANCEY: Proc. Malac. Soc. London, 

 vi, 1904, p. 125, pi. vii, f. 19 ; note bottom of p. 68, Journal of 

 Malacology, xi, 1904. 



L. clatkratiila may ultimately prove to be a synonym of 

 L. striatula. It is somewhat closely related to L. trunca-ta ; 

 both have few and widely separated spiral stria? ; in the latter 

 species, however, the apex is much blunter and there are more 

 apertural teeth. From the other species of Lyropupa it is 

 most easily distinguished by the stronger and more distant 

 spiral threads. The embryonic whorls are minutely, closely 

 and regularly spirally striate. The columellar lamella is 



