three whorls; about three and one-half whoris remaining, quite con- 

 vex, with a rather deep suture; last whorl a little detached^ from the 

 preceding near the aperture ; aperture like that of C. Wilkinsonii, but 

 smaller, with the outer peritreme a little wider proportionally and 

 without spots ; umbilicus very narrow, but extending through. 



Mean divergence about 25°; length .20 inch ; greatest breadth .15 

 inch : least breadth .11 inch. 



18. Cyclostoma solidum. Shell long, ovate-conic ; whitish or 

 brownish, with several narrow more or less interrupted sometimes 

 nearly obsolete spiral brown lines, often with large irregular zigzag 

 oblique spots of dark brown ; with very closely set strong rounded 

 transverse raised lines, which are a little larger in twos and threes at 

 the summit like a minute crenulation ; spire with moderately convex 

 outlines; apex truncate with the loss of two whorls ; four and one-half 

 whorls remaining, quite convex, with a well impressed suture; aper-. 

 ture nearly ciruclar ; inner peritreme slightly produced and reflected ; 

 outer peritreme broad, white or pale yellow, a little concave, widest 

 above and on the left side at the bottom of which it is subangular ; 

 umbilicus, very small. 



Mean divergence 50° ; length .78 inch ; greatest breadth ,55 inch ; 

 least breadth .4 inch. 



Var, a, with the outer peritreme fiery red. C. pictum, Humph. 

 Mss., Sowb. resembles this species, but is smooth and has an extremely 

 wide lip. * 



19. Cyclostoma Augustte. Shell much elongated, conic; shi- 

 ning, whitish or brownish, with. six spiral series in three pairs of nar- 

 row dark brown spots which are either oblong or sagittate, the middle 

 pair being more or less confluent, — with also a broad band and some more 

 or less distinct lines of flark brown around the umbilical region ; wiih 

 transverse strife very strong on the upper whorls, and feeble and distant 

 on the last whorl, decussated by faint spiral strise ; spire with the outlines 

 scarcely convex ; apex truncate with the loss of two or three whorls ; 

 five whorls remaining, with a moderately impressed suture, which is 

 subcrenulate by the enlargement of the upper ends of the transverse 

 lines in twos and threes ; aperture ovate-orbicular, oblique ; inner per- 

 itreme a little produced and reflected ; outer peritreme well expanded, 

 white, in some yellowish, more or less concave, much produced above 

 and inflected forming a deep pit, before the umbilicus reflected far 

 back into a deep sinus, with an alate expansion next to the sinus ; um- 

 bilicus very small. 



Mean divergence 38° ; length .9 inch ; greatest breadth .52 inch ; 

 least breadth .4 inch. 



