— 512 — 



Helicoceras D'Orb. 1842. Paleont. franc. Terr. oret. I. * 

 Etym. eli^, qiiod contortuin est; xsQag, cornu. 

 Novum genus Ammoniteorum, inter Turrilitas et Ha- 



mitas intermedium. 



Pariter Desh. 1845. Lamck. ed. 2a XI. p. 266. 

 MoRRis 1843. Brit. foss. p. 181. — genus Cephalo- 



podum. 

 Geinitz 1813 in Leonli. et Bronn Jahrb. p. 599. et 



1845 in Grundr. d. Verstein. p. 304. 305. — ge- 



nus rejicit. 

 Helicodon Ehrenb. 1831. Symb. phys. * > Oken Isis 1833. 



p. 734. 

 Etym. vid. seq. 

 Subgenus Cliilodon(is. 

 Helicoflonia Feruss. 1819. Prodr. p. 33. et 1821. Tabl. p. 



XXXII. 

 Etym. Ilelix; odovg., dens. 

 Subgenus Helicis ex inclusis volutatis. Subdivisio- 



nes: Personatao, Lamellatae, Maxillatae, Anosto- 



mae, Impressae. 



Pariter Rang 1829. Man. p. 161. 



Similiter Kryn. 1836. Bull. Mosc. IX. p. 165. 

 Cuvier 1830. R. a. ed. 2a (ed. Voigt. 111. p. 55.) — 



divisio subgeneris Helicis. 

 Helicogena Feruss. 1819. Prodr. p. 27. et 1821. Tabl. p. 



XXXII. 

 Etym. Helix; ykvog, genus. 

 Subgenus Helicis ex inclusis volutatis. Subdivisiones : 



Columellatae, Perforatae, Acavae, Imperforatae. 



Pariter Ram. 1829. Man. p. 160. 

 Cuvier 1830. R. a. ed. 2a (ed. Voigt. IIL p. 47.) — 



divisio subgeneris Helicis. 

 Helico^ena Risso 1826. Hist. IV. p. 59. 



Genus Helicidarum. Typi: H. pomatia, nemoralis etc. 

 Helicogena Beck 1837. Ind. p. 37. 



Subgenus Helicis, e sectione crassilabrium. 

 =: Tachea Leach. 



