L1GUUS CORONA. 177 



Key to Species of Corona. 



a. Outer lip black or blackish. 



b. White within ; a peripheral band generally developed. 



c. Dextral ; last half of the body-whorl blackish, 

 spire pink. regina, p. 177. 



c l . Sinistral, at least typically; last half of the body- 

 whorl not darker, the occasionally interrupted 

 peripheral dark band giving place to a wliitish 

 one in some specimens ; ground-color flesh-tinted. 



perversus, p. 178. 



b 1 . Purple within ; band in middle of upper surface of each 



whorl developed, short dark streaks between it and the 



suture ; sinistral. in visits, p. 179. 



a 1 . Outer lip and interior white ; no well defined spiral bands in 



adults. Sinistral, or rarely dextral. 



b. Last half of last whorl with yellow or green streaks. 



regalis, p. 180. 

 b 1 . Last half of last whorl black with orange spots. 



regalis var. loroisianus, p. 183. 



L. REGINA (Fe"russac). PI. 33, figs. 1, 2, 4, 5. 



Shell dextral, oblong-turreted, thick and solid. Spire pink, with a 

 median articulated band (sometimes faint or obsolete) and some 

 rather wide, separated longitudinal streaks, brown on the upper, 

 purplish on the penultimate whorl, upon which the ground-color 

 fades to the buff tint of the last whorl, wliere there is a variable number 

 of narrow brown longitudinal lines ; and the latter half of the whorl 

 usually becomes blackish olive, with some post-variceal snow-white 

 stripes. It is begirt at the periphery by a black-brown band, pale- 

 edged, which may generally be seen as a series of arrow-spots nearly 

 concealed by the suture, on the spire. Surface somewhat glossy, 

 nearly smooth, growth-lines being but slightly developed. Whorls 

 about 8, the apex usually self-amputated in large examples. 



Aperture pure white within ; peristome with a narrow black- 

 brown edge ; columella with a conspicuous callous fold above, 

 obliquely truncated at base ; parietal wall and columella covered 

 with a black callus, the fold of the columella fieshy white. 



Alt. 86, diam. 35, longest axis of aperture 39 mill. 

 12 



