250 TORNATELLIDES OF HAWAIIAN ISLANDS. 



Submenus WAIMEA C. & P., n. subg. 



The shell is similar in form to Tornatellides. It differs in 

 its costate surface and the broad, shallow, dorsal sulcus or de- 

 pression on the last whorl. In immature specimens there is a 

 rather long, low palatal fold and two eolumellar lamellae. The 

 embryonic whorls are spirally striate" as in Tornatellaria. 



54. T. RUDICOSTATUS (Ancey). PL 47, figs. 10, 11, 12. 



Shell oblong-attenuate, perforate, whitish when dead (and 

 very likely corneous in a fresh condition), remarkably ridged 

 with close, acute, nearly straight, not regular lirse. Spire 

 rather produced, conoid, rather obtuse. Whorls 6, convex, 

 regularly increasing, separated by a suture crenulated by the 

 ribs, the first whorl smooth, the last oblong, a little tapering, 

 with a median concentric sulcus on the back and towards the 

 aperture. Aperture slightly oblique, somewhat irregularly 

 truncate-oval, in adults unarmed except for a strong parietal 

 lamella. Columella a little thickened, arcuate. Peristome 

 acute, unexpanded, the eolumellar margin dilated and ex- 

 panded. Length 2%, diam. 1*4, alt. apert, % mm. (Ancey). 



In the young shell there are besides the parietal lamella two 

 acute plicae on the columella and a long transverse plica re- 

 volving within the palatal wall (Ancey). 



Hawaii: fossil in the Hamakua district (Henshaw, Thaa- 

 num). 



Tornatellina rudicostata ANCEY, Journal of Malacology, xi, 

 Sept. 29, 1904, p. 70, pi. 5, f. 20, 21. HENSHAW, t. c., p. 64. 



An extraordinary species, quite unlike anything described 

 in the genus. The general aspect is that of a very small Lep- 

 tachatina henshawi, but the plicae are coarser and irregular. 

 The sculpture is quite unusual in the genus. No living forms 

 are allied to this (Ancey). 



The specimen figured in Ancey 's paper is not adult. An- 

 cey 's type-specimen (no. 18448 Bishop Museum) is also an 

 immature shell. The specimen (Bishop Mus. coll. no. 14152) 

 figured on pi. 47, figs. 10, 12, has 6% whorls and measures: 



