9 



rather deep suture ; aperture subelliptical ; lip solid ; inner peritreme 

 scarcely produced ; outer peritreme moderately expanded, thick, stri- 

 ated, edge blunt; umbilicus narrow, extending through. 



Mean divergence 37° ; length .5 inch ; greatest breadth .3 inch ; 

 least breadth .23 inch. 



Cyclostoma xanthostoma, Sowb., is more coarsely sculptured 

 with less numerous spiral grooves, has sometimes the coloring of the 

 above, but is more frequently horn colored. 



24. Cyclostoma ignilabre. Shell elongate ; varying in different 

 individuals from a pale dingy brown to dark blueish slate color, but in 

 all is deeply colored at the extremities, with a fiery red lip ; with 

 closely set strong transverse raised lines, which are decussated by 

 many very faint stria3 ; spire with moderately convex outlines ; apex 

 truncate with the loss of three whorls ; four and one-half quite convex 

 whorls remaining, with a deep suture ; aperture and peritremes as in 

 the preceding : umbilicus narrow, extending through. 



Mean divergence 35° ; length .5 inch ; greatest breadth .27 inch ; 

 least breadth .2 inch. 



Var. a, with a white lip, and shell always pale dingy brown. 



25. Cyclostoma pisum. Shell short, ovate conic ; dark slate col- 

 ored, with a red lip ; with closely set strong transverse raised lines 

 decussated by very faint spiral lines, which are obsolete on the upper 

 whorls ; spire with quite convex outlines ; apex truncate with the loss 

 of two and one-half whorls ; three very convex whorls remaining, with 

 a very deep suture ; aperture circular ; inner peritreme a little pro- 

 duced and reflected ; outer peritreme much expanded, a little concave 

 and faintly striate; umbilicus rather wide, extending through. 



Divergence about 56° ; length .33 inch ; greatest breadth .315 inch ; 

 least breadth .215 inch. 



26. Cyclostoma hyacinthinum. Shell ovate conic ; deep greyish 

 blue, often in the progress of growth becoming pale brown and then 

 orange, always deep orange at the lip ; with rather strong but not very 

 prominent often whitish transverse raised lines, which are mostly in 

 groups of three or four, and are traversed by numerous spiral series 

 of short rectangular obliquely situated indentations, which are of a 

 dark brown in brownish parts of the shell, — with very unequal and 

 inequidistant small crenulations in the suture ; spire with rather con- 

 vex outlines ; apex truncate with the loss of two whorls; four quite 

 convex whorls remaining, with a deep suture ; aperture orbicular, 

 slightly angulated above; inner peritreme slightly produced ; outer peri- 

 treme narrow, concave, deeply striated, sharp-edged, wanting at the 

 contact with the penultimate whorl, auriculate above ; umbilicus 

 extending through. 



