8 Hawaiian Species of Helicina. 



Helicina sulculosa Ancey. 



Helicina sulculosa Ancey, P. Malac. Soc. London, vi, 190-I, p. 127, pi. vii, 

 fig- 25. 



This species aud H. laci)iiosa Migh. var. alpha are very closely 

 related. The spire of the former is more depressed, the whorls 

 are slightly more convex and the aperture is more rounded. 



This is the only species so far reported from the island of 

 Hawaii. M. Ancey's measurements are : diam. 3.33, alt. 2.5, alt. 

 apert. 1.5 mm. 



Hawaii: Olaa (Thaanum). 



Helicina hawaiiensis, n. sp. 



Fig. 6. 



The shell is depressed with a conical spire, periphery rounded, 

 quite thin, nearly smooth, under a strong lens minutely striate 

 with lines of growth and, in type specimen, with five fine raised 

 spiral striae, two above, one encircling and two below the periphery. 

 Color a dull yellowish green interspersed with a few irregular 

 light reddish flammules above. Apex somewhat acute. Suture 

 simple, well impressed. Whorls 3^, convex, the embryonic mi- 

 nutely striate, the last rounded with the base somewhat flattened, 

 slightly descending in front. Aperture elongate-semicircular, not 

 contracted ; outer lip thin. Callus small, thin, transparent, mi- 

 nutely granulose. Operculum whitish, thin, granulose. Maj. 

 diameter 5.5, total length 3.7 mm. 



Oahu. 



Type No. 58,384, Phil. Ac. Nat. Sci. 



This species approaches H. knudseyii in form. Its larger size, 

 the absence of forwardly descending wrinkles and the presence of 

 raised spiral lines enable it to be easily distinguished from the 

 Kauaian species. Its closest relative is H. rotelloidea Migh. The 

 two differ considerably in size, color pattern, etc. 



Helicina knudseni, n. sp. 



Fig- 7- 

 The shell is depressed with a conic spire, the periphery 

 rounded, quite thin, nearly smooth, minutely striate with lines of 

 growth, under a strong lens these are intersected, almost at right 



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