144 



deeply impressed suture : aperture orbicular, slightly effuse and pointed above ; lip 

 scarcely sinuate above, much advanced along the middle of the right side, mod- 

 erately tliickened : umbilicus four-fii'ths as wide as tlie aperture. Operculum with 

 a much elevated spiral lamella, in seven or eight whorls, which are much inflect- 

 ed but not so curvately as No. 1. 



Mean divergence about 145°; height .6 inch; greatest breadth 1.08 inch ; 

 least breadth .85 inch. 



No. 3. Shell with the spire brownish red, and the last whorl white ; with a 

 brown epidermis: with the transverse striae fine and regular on the spire, and very 

 irregular on the last whorl ; with fine wrinkles commencing above near the end 

 of the penult whorl ; last whorl very coarsely and irregularly wrinkled above, 

 nearly or quite smooth beneath ; the umbilical keel is obsolete : spire depressed : 

 wliorls nearly five ; last whorl flattened above ; with the suture moderately im- 

 pressed : aperture orbicular, slightly efflise and pointed above ; lip scarcely sinuate 

 above, moderately advanced on the right side : umbilicus about two-thirds as wide 

 as the aperture. Operculum with a much elevated spiral lamella, the whorls of 

 which, six or seven in number, are saucer-shaped ; that is, reflected, with the inner 

 surface concave : the lamella is like that of No. 1 inverted. 



Mean divergence about 145°; height .67 inch; greatest breadth 1.15 inch; 

 least breadth .91 inch. No. 3' differs in having the lower part of the last whorl 

 finely wrinkled. 



No. 4. This resembles No. 3, but the wrinkles on the last half of the last 

 whorl are somewhat regular, oblique, and very large : the umbilical keel is well 

 developed : the umbilicus is only half as wide as the aperture. The opercuiimi is 

 unknown. 



No. 5. Upper whorls horn color or light red ; lower whorls white, with a brown 

 epidermis: witli the transverse slrias rather fine and irregular ; wrinkles commenc- 

 ing on the antepenult whorl, regular, oblique and well defined on the penult whorl, 

 sometimes regular on the lower part of the last whorl ; umbilical keel well devel- 

 oped : spire somewhat depressed : whorls about four and one-half, scarcely flat- 

 tened above, with a well impressed suture : aperture orbicular, slightly effuse and 

 pointed at the junction with the penult whorl ; lip rather thin, sliglitly advanced in 

 the right side : umbilicus two-tliirds as wide as the aperture. Operculum with a 

 spiral lamella of about eight whorls, with the upper margins reflected and expand- 

 ed 60 as to be nearly in contact. 



Mean divergence about 135° ; height .55 inch ; greatest breadth .9 inch ; least 

 breadth .72 inch. 



No. 6. White, often reddish above ; with a brown epidermis : with the trans- 

 verse striae extremely fine, somewhat regular on the upper whorls ; wrinkles com- 

 mencing on the antepenult whorl, fine, regular and oblique on the penult whorl and 

 at the beginning of the last whorl, on the rest of which they are fine and irregu- 

 lar: umbilical keel well developed: spire well elevated: whorls five; last whorl 

 slightly depressed above ; suture well impressed : aperture suborbicular, quite effuse 

 and pointed above ; lip well thickened, moderately advanced on the right side j 

 umbilicus about three-fifths as wide as the aperture. Operculum slightly concave, 

 with a thick spiral lamina of seven or eight whorls, the upper part of which is ex- 



