21 



ture subovate, stained with a pink color just within the margin ; 

 lip slightly thickened. Length, | inch, diameter, — inch. Hab. 

 Oahu. 



AcHATiNELLA MUSTELiNA. Shell dcxtral, conical, dark brown, 

 with a light revolving band at the suture, perforate ; whorls 

 seven, convex; aperture oblong; lip simple, acute. Length, 

 1 inch, diameter ^% inch. Hab. Waianai. 



AcHATiNELLA ciNGULA. Shell dcxtral, ovate-conic, horn color, 

 smooth and polished, with a narrow brown band accompanying 

 the suture, imperforate ; whorls seven, convex ; aperture small, 

 subovate ; lip simple. Length, ^i- inch, diameter, ^ inch. 

 Hab. Oahu. 



AcHATiNELLA VENUSTA. Shell sinistral, conical, body whorl 

 large and tumid, reddish yellow, beautifully ornamented with 

 black zig-zag lines, more or less numerous and regular, per- 

 forate ; whorls six, convex ; aperture subovate ; lip simple, 

 acute. Length, f inch, diameter, -^^ inch. Hab. Oahu. 



AcHATiNELLA TiCTA. Shell sinistral, short, thick, conical, light 

 yellow, with black zig-zag lines, more or less numerous, per- 

 forate ; whorls six, convex ; aperture campanulate ; lip simple, 

 acute. Length, /^ inch, average diameter, f inch. Hab. Oahu. 



AcHATiNELLA INORNATA. Shell dcxtral, elevated, turreted, 

 sometimes straw-colorcd, sometimes dark brown, unadorned, 

 perforate ; whorls seven, convex ; aperture subovate ; lip simple, 

 acute. Length, f inch, diameter, -^^ inch. Hab. Oahu. 



SucciNEA PATULA. Shell ovatc, pellucid, fragile, yellowish ; 

 last whorl very large, composing almost the whole shell, there 

 being only about half a volution above it, forming a minute 

 knob ; aperture oval, very large and open ; lip very thin. 

 Length, ^ inch, breadth, |- inch. Hab. Oahu. 



SucciNEA CADUCA. Shell sub-ovate, very thin and fragile, 

 horn color ; whorls about two and a half, the last very large ; 

 spire rather prominent; aperture elongated-oval; lip thin. 

 Length, ^^^j inch, breadth, ^ inch. Hab. Oahu. 



Physa UMBiLicATA. Shell subovate, gibbous, reddish brown; 

 whorls about three and a half; aperture campanulate, oblique ; 

 columella fold prominent ; outer lip rather thick ; umbilicated. 

 Length, -^^ inch, breadth, jjj inch. Hab. Oahu. 



Physa producta. Shell elongate-oval, thin, fragile, pellucid, 

 horn color, imperforate ; whorls four ; suture well impressed ; 



