HELIOINA. 165 



not numerous, they inhabit tlie Indian Ocean. A fossil species 

 occurs at Grrignon, near Paris. Mr. Eeeve's Monograpli con- 

 tains 9 species. Ex. H. ventricosa. PI. xix. fig. 419. 



HAEPAX. Parkinson. Part of Pltcatjla, Auct, 



HAEPULA. Swainson, 1840. A group of shells separated from 

 VoLTJTA, Auct. thus described, " shell generally tuberculated or 

 longitudinally ribbed ; apex of the spire papillary, smooth, and 

 in general distorted ; pillar with numerous distinct plaits ; the 

 upper, small and slender, the lower, thickest and shortest." — 

 Type, H. VexiUum. (Yoluta, Auct.) Thesaurus Conchyliorum. 

 PI. 1. fig. 54, 55 ; PI. xxvi. fig. 557. 



HATJSTATOE. Montf. A genus proposed to include those 



. species of Tueeitella, Auct. which have angulated whorls. 



HAUSTELLAEIA. Swainson, 1840. Beontes. Montf 1810. 

 A sub-genus of Murex, consisting of species with long canal and 

 no spines. Murex haustellum, fig. 396. 



HAUSTEUM. Humph. Puepuea, Lamarck. 



HELCIOlSr. Montfort, 1810. A genus composed of species of 

 PateUa, which have the apex distinctly and prominently bent 

 forwards. Ex. P. pellucida. PI. xii. fig. 230. 



HELENIS. Montf. A genus of microscopic Foraminifera. 



HELICELLA. Per. One of the sub-genera into which De 



■ Eerussac has divided the genus Helix, consisting of depressed 

 species with large umbihcus, such as Helix Algira, (Gronites 

 Montf.) fig. 279. 



HELICIEOEM. Shaped like shells of the genus Helix. 



HELICIGONA. One of De Eerussac' s sub-genera of the genus 

 Helix, consisting of angulated species, such as CarocoUa 

 Lamarckii, fig. 277. 



HELICINA. Lamarck, 1801. Eotella, Lamarck, 1822. 



HELICINA. Lamarck, 1822. Oltgiea, Sacy. Fam. CoHmaeea, 

 Lam. EHipsostomata, Bl. — Descr. Globose, compressed, or an- 

 gulated, generally light and thin; aperture trigonal or semi- 

 lunar ; outer lip thickened and generally more or less reflected ; 

 inner lip spread over the body whorl, frequently callous near the 



- columella, which is short, and terminates in a notch, angle, or 



