106 AURICULELLA, MOLOKAI. 



The small point, such as Mr. Ancey described as ending on 

 the columella of A. canalifera, is sometimes found in this 

 .species also. In 1759 specimens examined by Mr. Thaanum 

 and myself only three and one-third per cent were dextral. 



The perforate form with a thin parietal callus described 

 as typical is not so common as the imperforate form with a 

 heavy parietal callus. Posteriorly the edge of the callus usu- 

 ally becomes thickened and somewhat tuberculiform. In ob- 

 lique view in the aperture the columella appears more strongly 

 twisted than that of A. canalifera. 



24. A. CANALIFERA Ancey. PL 19, figs. 1, 2. 



" Shell sinistral, imperforate, ovately conic, somewhat thin, 

 .glossy, marked with oblique, smooth and obsolete lines of 

 growth, unicolorous tawny, or encircled at the middle of the 

 last whorl with a brown band, or sometimes dark tawny chest- 

 nut and encircled by a peripheral whitish band accompany- 

 ing the suture above. Spire conic, somewhat produced, apex 

 obtuse ; whorls 6%, nearly flat, suture appressed, the last di- 

 lated, rotund, short, not ascending. Aperture oblique, irregu- 

 larly ovate, dilated below, emarginate, armed with a com- 

 pressed, whitish, small parietal lamina, becoming weaker 

 within. Columella appressed, slightly twisted-plicate, armed 

 with a whitish fold, ending exteriorly in a minute spine ; ob- 

 liquely viewed it appears minutely bisinuate. Lip thin, 

 scarcely thickened except at the columella, with the margins 

 united by a simple and glossy, not tuberculate callus. Length 

 6.75, diam. 3.6, length of ap. (oblique) 2.5 mm." (Ancey). 



Molokai: Halawa (Baldwin) ; Mapulehu Ridge, Kookoholua 

 Thaanum). 



Auriculella canalifera ANCEY, Proc. Mai. Soc. London, vi, 

 1904, p. 121, pi. 7, fig. 11. 



"A very characteristic species, remarkable on account of 

 the features of its columella, and unlike any others in that 

 respect. The shell has the texture of A. diaphana, but has a 

 more produced spire, different columella and is imperforate" 

 (Ancey). 



The columellar lip is not built forward, as it is in the imper- 

 forate form of A. brunnea, which is very closely related. 



