50 TERRESTRIAL AIR-BREATHING MOLLUSKS. 



Eucalodium, 1 Coelocentrum, 2 Lithotis, 8 Rhodea, Megaspira* Limicola- 

 ria, 5 but one species ha§ a ribbed jaw, Achatina, 6 Pseud achat ina ? Peri- 

 deris? Columna V Bulimics as now constituted has various forms of 

 jaw. 



(6) Jaw with decided stout ribs : Anadenus 8 Arion, Ariolimax, Pro- 

 physaon, Pallifera, Veronicella, Binneya, Heviphillia, the genera of dis- 

 integrated Helix, 9 Geomolacus, 10 Letournexia, 11 Peltella, 1 ' 2 Xanthoyiyx, 18 

 Simpidopsis, u Pfeifferia,™ Berendtia, 16 Carelia^ 1 and, as stated above, 

 some species now included in Bulimus, Coehlostyla, Buliminus, Limi- 

 colaria. 



(c) Jaw with separate, delicate ribs, usually running obliquely to- 

 wards the centre : Gratis, 18 Amphibulima, 19 Bulimulus, C ' ylindrella, Ma- 

 croceramus™ Pineria, 21 Partula. 22 



B. The genera whose jaw is in one piece with an accessory quadrate 

 piece are Siuccinea, 28 Omalonyx 2i Hyalimax™ Athoracophorus. 26 



0. The genera whose jaw is in separate pieces are Orthalicus, Liguus, 

 and Punctum, 21 



I have arranged the American genera in the same manner in the 

 follow ng pages. 



1 See Crosse and Fischer, Journ. de Conch., 1870, PL V. Fig. 1. 



2 Jaw and dentition unknown. 



3 Binney, Proc. Phila. Ac. Nat. Sc. 1874, PI. V. Fig. 3. 

 * Jaw and dentition unknown. 



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



« Von Martens, ed. 2, p. 201. 



1 Jaw and dentition unknown. 



8 Heynemann, Malak. Blatt., X. 138, PI. I. Fig. 1. 9 See this work. 



io Bland and Binney, Ann. of Lye. of N. H. of N. Y., X. 309, Fig. 



" Bourgignat, Moll. nouv. et lit., VII. 201, PI. XXXIV. Figs. 1-7. 



12 Jaw apparently rihbed in Ferussac's figure, PI. VII. A. 



18 Fischer and Crosse, Moll. Mex., PI. IX. Figs. 15. lfi 



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



16 Morch, Journ. de Conch., 1865, 385. 



16 Crosse and Fischer, Journ. de Conch., 1870, PI. V. Figs. 11, 12. 



» Binney, Pr. Phila. Acad. Nat. Sc. 1876, p. 185. 



18 Blandand Binney, Ann. Lye. N. H. of N. Y., Vol. X. PI. XL Figs. 1, 5-7. 



19 Proc. Phila. Ac. N. Sc. 1874, PI. VIII. Figs. 2, 5, 6. Pellicula is a synonyme of this. 



20 See this work. 21 Bland and Binney, Ann. N. Y. Lye. N. H., X. 22. 

 22 Binney, Ann. Lye. N. H. of N. Y.. XL 45. 



28 See this work. 24 Malak. Blatt., X. PI. IV. Yiz. 5, a. 



26 Fischer and Crosse, Journ. de Conch., XV. 218, PI. X. Figs. 5, 7. 



26 Bergh, verh. kais. koenig. zoolog. botan. Gesell. in Wien., XX. 844, PI. XII. Figs. 



2, 4, 5. 



27 See this work. 



