Conulus Tryon 1866. Anier. journ. conch. IL p, 256: 

 genus Gastrodoutinarum. 



— Binn. & Bland 1869. Amer. landsh. p. 46: 

 subgenus Hyalinae. — Par. Kreglinger 1870. 

 Verz. p. 50. 



Petasia Beck 1837. Ind. p. 21: subgenus Helicis. (pt.) 



— Mörch 1864. Syn. moU. Dan. p. 14: subgenus 

 Hyalin iae. 



(Species 71.) 



Seet. 11? Sagdinella. 

 Sagdinella Mürch 1872. Journ. Conch. XX. p.312: 



1876. ibid. XXIV. p. 358: Sectio Helicis, an 



Agnathis adnumeranda? 



(Species 2.) 



Sect. 12? Hyalosagda. 

 Plyalosagda Albers 1860. Helic. ed. Mart. p. 77: 



Sectio Sagdae. Typus: Helix similis Ad.) 



(Species 10.) 



Sect. 13. Gastrodonta. 

 Gastrodonta Albers 1850. Helic, p. 88: sectio He- 

 licis. — Par. Pfr. 1845. Vers, p, 129. 



— H. & A. Adams 1855. Gen. II. p. 113: subgenus 

 Sagdae. 



— Albers 1857. Malak. Bl. IV. p. 91 ; 1860. Helic. 

 ed. Mart. p. 74: sectio Hyalinae. 



— Tryon 1866. Amer. journ. conch. II. p. 257: 

 genus Gastrodoutinarum. 



— Binney & Bland 1869. Amer. landsh. p. 48: 

 subgenus Hyalinae. 



Subsect. a? Ventridens. 



Ventr idens Binn. & Bland 1869. Amer. landsh. p. 292: 



subgenus Zonitis. (Poro mucoso distinctum.) 



Subsect. b. Helicodiscus. 



Helicodiscus Morse 1864. Journ. Porti. Soc. I. p. 25: 



novum genus ex typo H. lineatae Say. 



