838 



NATICID^. 



Family NATICID^, Swainson. 



Shell spiral, usually smooth or polished, more or less globular ; 

 aperture semi-lunar, sometimes very large. 



Ocnus LUNATIA, Gray. 1847. 



Operculum simple, cartilaginous. 



Shell oval sub-globose ; spire rather elevated ; aperture semi-lunar ; 

 inner lip thin, or with a moderate callus ; umbilicus wide ; pervious, 

 not fuuiculate. 



Lunatia heros. 



Fi.s^ 608. 



Fig. 160. 



Shell sub-globose, ash colored, whorls five, a daik, chestnut colored band re- 

 volving about the three upper ones; umbilicus large and simple. 



Natica heros, Say, Journ. Acad. Nat. Sc. ii. 248, 1822. — Gould, Inv. 1st ed. 231. — Dk 



Kay, N. Y. Moll. 120, pi. 7, fig. 148. — Piiilippi, Ahbild. pi. 1, fig. 4. 

 Ampiil/an'a borrulis, Valenc. in HuMU. and Bonpl. ii. Rcccuil d'Obs. 260. 

 ? Natica ampullaria, Lam. An. sans Vert. viii. 633. 

 Lunatia heros, Stimpson, Check Lists, 5. 



Shell globose-ovate, thick, ash colored, or sometimes brownish, 

 shining when divested of its thin, yellowish epidermis ; distinct lines 



of growth, and very minute revolv- 

 ing lines cover the surface ; whorls 

 five, very convex, slightly flattened 

 near the top, so as to present a slight 

 angular appearance ; the three pos- 

 terior whorls have the lower half of 

 a dark chestnut color, and the other 

 half rather lighter than the rest of 

 the shell ; suture well marked ; ap- 

 erture ovate ; the lip, sharp aljovc, l)C- 

 comcs thicker and smoothly round- 

 ed, and as it rises l)y the side of the 

 uml)ilicus it expands to a consider- 

 able breadth ; a very thin layer of 

 enamel is spread over the portion 

 of the whorl which completes the aperture ; throat of a delicate, 

 somewhat clouded chestnut color, with a margin sometimes bright 



L. heros. 



