19 



In general form it resembles H. ligera, but may be distinguished 

 •by the absence of umbilicus, and, upon particular examination, by 

 the teeth, which are situated far within the aperture. In the col- 

 lection of the Academy. 



H. LIGERA. Shell subglobose, pale yellowish horn color, 

 polished ; body whorl pellucid, yellowish white, opake beneath 

 near the aperture ; volutions rather more than six, all except the 

 apicial one, wrinkled across ; spire convex, a little elevated ; um- 

 bilicus very small ; suture not deeply impressed ; labrum not 

 reflected. 



Inhabits Missouri. Greatest length three-tenths, oblique length 

 less than nine-twentieths, transverse diameter less than eleven- 

 twentieths. 



Approaches nearest to H. glaphyra, but is readily distinguished 

 by the greater convexity of the spire, and the smaller umbilicus. 

 Rather common. In Lister's Conch, on pi. 81, fig. 82, a shell is 

 represented which may be intended for this species. 



H. SOLITARIA. — Shell subglobose, with two or three revolving, 

 rufous lines ; spire conico-convex ; volutions five and a half, wrin- 

 kled across and rounded ; suture rather deeply impressed ; aper- 

 ture wide, embracing a rather small portion of the penultimate 

 whorl ; labrum noi reflected ; umbilicus large, distinctly exhibit- 

 ing all the volutions to the apex. 



Grreatest transverse diameter nearly one and one-fifth of an inch. 

 Inhabits lower Missouri. 



But a single specimen was found ; it was a dead shell, destitute 

 of its epidermis. It is a very distinct species. 



H. JEJUNA. — Shell subglobular, glabrous, pale reddish brown ; 

 volutions five, slightly wrinkled, regularly rounded ; spire con- 

 vex ; suture rather deeply impressed ; aperture dilate lunate ; 

 labrum a little incrassated within, not reflected ; umbilicus open, 

 small. 



Breadth rather more than one-fifth of an inch. Inhabits the 

 Southern States. 



x\nimal — light reddish brown, with a granular surface, longer 

 than the breadth of the shell ; oculiferous tentacula elongated, and 

 rather darker than the body. 



This shell is very closely allied to H. sericea of Southern 

 Europe, but it difiers from that species in being destitute of the 



