TORNATELLIDES OF HAWAIIAN ISLANDS. 233 



more ample, wider. Aperture suboblique, emarginate, with a 

 strong revolving lamella on the belly of the penultimate whorl 

 and two obsolete co-lamellar denticles, the lower one smaller. 

 Peristome simple, acute, -the upper margin arcuate, columellar 

 margin dilated, expanded. Length 3, diam. y 2 , length of 

 apert. 1, width scarcely 1 mm. " (Ancey). 



West Maui: highest point; Lahaina (Baldwin). Type no. 

 18430 Bishop Museum, paratypes no. 18431 and 18432 Bishop 

 Museum and no. 111719 P. A. N. S. 



Tornatellina euryomphala ANC., Bull. Soc. Malac. France, 

 vi, 1889, p. 239. SYKES, Faun. Haw., ii, p. 381. 



" Differs from newcombi by its smaller size, the number of 

 whorls, width of the umbilicus, strong parietal lamella, and 

 the slightly projecting, obsolete, columellar denticulations" 

 (Ancey). 



Ancey 's type material consists of three specimens. A single 

 adult and two immature, one of which is nearly adult. There 

 is a second lot of six specimens from Lahaina collected by Bald- 

 win and named by Ancey. One of these is almost the dupli- 

 cate of the type and is in far better condition. This specimen 

 (pi. 50, figs. 1, 2) has 6^/2 whorls and measures: length 3, 

 diam. 1.5, axis of apert. 1.05, par. lam. 0.16, umb. 0.36 mm. 

 Aiicey's type measures 1.5 mm. in diameter, not one-half 

 Dim., as stated in his description. 



T. euryamphala and T. macro ptychia are very closely re- 

 lated. The former is slightly larger, with more convex whorls, 

 the base is flatter and the umbilicus is larger. In adult speci- 

 mens the upper columella fold is stronger than the lower. 

 The surface is minutely stria te. 



An immature specimen, from the same lot as the figured 

 specimen, is much lighter in color. It has 51/4 whorls, the 

 lower columellar fold is much stronger than the upper, the 

 former being 0.12, the latter 0.05 mm. in height. The parietal 

 lamella is 0.2 mm. in height. It is eccentrically ribbed with 

 3-4 raised lines, one of which forms the inner margin of the 

 lamella. The embryonic whorls are not spirally striate (fig. 

 3). 



