148 PROCEEDINGS OF THE ACADEMY OF 
Acavus, Corilla, Caryodes, Panda, Labyrinthus, Caracollus,' 
Leucochroa,’ Cysticopsis ?? Plagioptycha,’ Leptoloma, Anostoma,’ 
Anostomella?? Tomigerus? Boysia? Plectostoma? Hypselosto- 
ma 2° Achatinella,? Clausilia,” Stenogyra,” Strophia,” Buliminus,” 
Balea,* Pupa,” Vertigo, Ferussacia,' Cexcilianeila,'* Geostilbia ? 
Azeca? Tornatella?"® Zospeum 2” Holospira,” Hucalodium” Celo- 
centrum,” Lithotis,* Rhodea, Megaspira,” LInmicolaria,® but one 
species has a ribbed jaw, Achatina,” Pseudachatina ? Perideris ? 
Columna 2?* Bulimus as now constituted has various forms of jaw. 
(6) Jaw with decided stout ribs: Arion, Ariolimax, Prophy- 
saon, Pallifera, Veronicella, Binneia, Hemphillia, Helix,*® Geomo- 
lacus,” Letournexia,” Peltella,’ Xanthonyx,® Simpulopsus,* Pfeif- 
1 See Semper, |. c. No doubt other genera of disintegrated Helia will be 
found to be grouped here. I propose at present to remove from Helzz all 
the species not having ribs upon their jaw. 
2 Bland and Binney, Ann. Lyc. Nat. Hist. of N. Y., X., 220. 
8 Bland and Binney, Ann. Lyc. N. H. of N. Y., IX. 
4 Proc. Ac. Nat. Sc. Phila. 1874, 56. 5 Tbid. 58. 
6 Journ. de Conch., XIX., 261, pl. XI., fig. 4. 
7 Jaw and dentition unknown. 
§ Jaw and dentition unknown. 
8 Bland and Binney, Ann. Cyc. N. H. of N. Y., X., 385, pl. XV., figs. 
Grae 
10 Troschel, Moquin-Tandon, Lehmann, etc. 
11 See this paper. 2 See this paper. 
3 But some species have ribs. See Moquin-Tandon, Lehmann, etc. 
4 Moquin-Tandon, Moll. Fr., pl. XXYV., fig. 6. 
5 See this paper. 16 See this paper. 
7 See this paper. '8 See this paper. 
18 Unknown. 
2 Heynemann, Mal. Bl. X., pl. IIl., fig. 14. Jaw unknown. 
21 See this paper. 
22 See Crosse and Fischer, Journ. de Conch. 1870, pl. V., fig. 1. 
3 Jaw and dentition unknown. 
21 Binney, Proc. Phila. Ac. Nat. Sc. 1874, pl. V., fig. 3. 
% Jaw and dentition unknown. _ 
26 Bland and Binney, Amer. Jour. Conch., VII., 181. 
2 Von Martens, ed. 2, p. 201. 
% Jaw and dentition unknown. 2 See this paper. 
*0 Bland and Binney, Ann. of Lyc. of N. H. of N. Y., X., 309, fig. 
3 Bourgignat, Moll. nouv. et lit. VII. 201, pl. XX XIV., fig. 1-7. 
82 Jaw apparently ribbed in Férussac’s figure, pl. VII. A. 
33 Fischer and Crosse, Moll. Mex., pl. IX., figs. 15, 16. 
31 Shuttleworth, Diag., No. 6, p. 147. 
