370 PROCEEDINGS OF THE ACADEMY OF [NoV., 



the columellar-basal region. These impressed Rnes are very smoothly 

 evenly engraved, widely spaced, and appear white on the translu- 

 cent ground. The rounded vertex is minutely perforate. There 

 is a fine slit behind the columellar callus. The aperture dilates 

 below. Outer lip arches forward; basal lip receding. The colum- 

 ella is only weakly concave with a narrow, expanded edge, forming 

 a long mnbihcal crevice; below it is slightly truncate. 



Length 7.8, diameter 3.3 mm. 



Kauai: Haena (W. A. Bryan). 



A less cylindric species than H. curta. 



HamincBa tomaculiun Pils. 



Haminea curta tomaculum Pils., Proc. A. N. S. Phila., 1917, p. 219, fig. 10. 



Further study of the Hawaiian Hamineas convinces me that this 

 form differs specifically from H. curta A. Ad. 



The three species preceding, as well as H. papyrus (A. Ad.), H. 

 hrevis (Q. & G.), H. cairnsiana Melv. and H. cuticulifera Smith, be- 

 long to the group which I have called Liloa. It is quite possible 

 that when the animal can be examined, this group will be transferred 

 to the vicinity of Ahjs. The sculpture and the form of the colum- 

 ella are much like Atys and unhke other groups of HammcBa. Atys, 

 however, has a fold in the axis posteriorly. Roxaniella Monts and 

 Damoniella Iredale^ differ by having the summit umbilicate. It is 

 barely perforate or sometimes imperforate in Liloa. 



Volvatella fragilis Pease. 



Volvatella fragilis Pse., P. Z. S. 1860, p. 20; Amer. Journ. Conch. IV, p. 

 73, pi. 7, fig. 4. Description and figures repeated in Man. Conch. XV, 

 p. 384. 



Sandwich Islands. Not found since the time of Pease. 



HYDATINID^. 



Thin, oval, capacious shells, banded, with the spire flattened or 

 convex. The Hawaiian species are widely ranging forms. 



1. Base contracted by a furrow running spirally from the insertion 

 of the columella; aperture shorter than the shell; two pink 

 and three white zones, separated by narrow blackish bands. 



Hydatina (Aplustruin) amplustre (L.). 



Base not so contracted; aperture nearly as long as the shell; 



columella broadly concave 2 



^ Damoniella Iredale, Proc. Malac. See. Lond. XIII, p. 37, new name for Rox- 

 ania Leach, not Roxana Stephens. Type Bulla cranchii. 



