148 PROCEEDINGS OF THE ACADEMY OF 



Acavus, Gorilla, Garyodes, Panda, Labyrinthus, Garacollus,^ 

 Lexicochroa^ Cysticopsis?^ Plagioptycha,^ Leqjtoloma,^ Anostomia^ 

 Anoi<tomellaV Tomigerus'i Boysia? Plectostoina? Hypaelosto- 

 ma ?^ Achatinella^ Glaunilia^'^ Sfenogyra,^^ Strophia,^'^ Buliminus^'' 

 Balea^^ Pupa,^'" Vertigo,^^ Feriissacia,^'' Caecilianella,^^ Geostilbia ? 

 Azeca ? Tornatella P'^ Zospeum ?'^° Holospira,^^ Euc alodium'-'^ Gcelo- 

 centrum,'^ Lithotis,'^ Bhodea, Megaspira,^^ Limicolaria,-^ but one 

 species has a ribbed jaw, Achatina,''' Pseudachatina ? Perideris? 

 Golumna?'^ Bulimus as now constituted has various forms of jaw. 

 (b) Jaw with decided stout ribs : Avion, Ariolimax, Projihy- 

 saon, Pallifera, Veronicella, Binneia, Hemphillia, Helix,-^ Geonw- 

 lacus,^^ Letournexia,^^ Peltella^- Xanthonyx,^^ Sinipiulopsus^^* Bfeif- 



' See Semper, 1. c. No doubt other genera of disintegrated Hel/'x will be 

 found to be grouped here. I propose at present to remove from Helix all 

 the species not having ribs upon their jaw. 



2 Bland and Binney, Ann. Lye. Nat. Hist, of N. Y., X., 220. 



3 Bland and Binney, Ann. Lye. N. H. of N. Y., IX. 



* Proc. Ac. Nat. Sc. Phila. 1874, 56. « n^id 53. 



6 Journ. de Conch., XIX., 261, pi. XL, fig. 4. 



' Jaw and dentition unknown. 



s Jaw and dentition unknown. 



9 Bland and Binney, Ann. Cyc. N. H. of N. Y., X., 335, pi. XV., figs. 



6. 



'° Troschel, Moquin-Tandon, Ijehmann, etc. 



" See this paper. '^ See this paper. 



" But some species have ribs. See Moquin-Tandon, Lehmann, etc. 



» Moquin-Tandon, Moll. Fr., pi. XXV., fig. G. 



'5 See this paper. '^ See this paper. 



'7 See this paper. '^ See this paper. 



'9 Unknown. 



'° Heynemann, Mai. Bl. X., pi. III., fig. 14. Jaw unknown. 



2' See this paper. 



*2 See Crosse and Fischer, Journ. de Conch. 1870, pi. V., fig. 1. 



2' Jaw and dentition unknown. 



2' Binney, Proc. Phila. Ac. Nat. Sc. 1874, pi. V., fig. 3. 



25 Jaw and dentition unknown. 



^^ Bland and Binney, Amer. Jour. Conch., VII., 181. 



27 Von Martens, ed. 2, p. 201. 



2S Jaw and dentition unknown. 29 ggg tiijg paper. 



■0 Bland and Binney, Ann. of Lye. of N. H. of N. Y., X., 309, fig. 



3 Bourgignat, Moll. nouv. et lit. VII. 201, pi. XXXIV., fig. 1-7. 



32 Jaw apparently ribbed in Ferussac's figure, pi. VII. A. 



53 Fischer and Crosse, Moll. Mex., pi. IX., figs. 15, 16. 



** Shuttleworth, Diag., No. 6, p. 147. 



