344 SHELLS AND SHELL-FISH. PART II. 



aperture ; outer lip thin, but thickened on the in- 

 ternal margin ; one or both lips with distinct teeth 

 or plaits ; animal with two tentacula, sessile eyes, 

 but no operculum. 



Geovula Sw. Oval ; spire very short, tur- 

 binated, cancellated, of many whorls ; 

 apex obtuse ; outer lip thickened inter- 

 nally; inner lip with a strong plait near 

 the base. (fig. 105.) 



G. Midae. Griff. Cuv. 27. f. 8. 



Pedipes Adans. Shell smalJ, turbinate or 

 sub-spiral j body- whorl ventricose ; aper- 

 ture on both sides defended by several teeth and plaits. 

 P. afra. Lowe, in Zool. Journ. v. pi. 12. f. 8 12. 



Scarabus Montf. Shell depressed ; spire as long as the 

 aperture ; umbilicus partly open j both lips with 

 plaits, and tuberculous teeth. 



S. imbrium. Sow. Man. f. 299. 



Melampus Montf. Oval, sub-coniform ; spire very 

 short, obtuse ; aperture narrow ; inner lip thin, and 

 striated internally ; pillar plaited, 

 fasciatus. Gr. Cuv. 27. f. 13. exiguus .Lew. Z. J. v. 12. f. 6,7. 



Rhodostoma Sw. General form of Melampus and 

 Tornatetta ; but the aperture is not striated, and the 

 inner margin of the lip is broad, considerably thick- 

 ened, and distinctly notched towards the top. 



coffea. Chem. 120. f. 1043. nucleus. Fer. Tab. Sys. 105. 



fabula. Fer. Tab. Sys. 1 05. 24. 26. 



SCISSURBLLA D' OrMg. Shell very small or minute ; he- 

 liciform ; spire depressed ; aperture effuse ; outer lip 

 with a narrow fissure or slit ; umbilicus open. 

 S. elatior. Sow. Man. f. 340. 



FAMILY NATICIDJE. 



Shell globose, generally smooth ; spire minute, scarcely 

 raised ; aperture large, semicircular. 



