NATURAL SCIENCES OF PHILADELPHIA. 149 
feria, Berendtia,’ and, as stated above, some species now included 
in Bulimus, Cochlostyla, Buliminus, Limicolaria. 
(c) Jaw with separate, delicate ribs, usually running obliquely 
towards the centre: Geotis, Amphibulima,t Bulimulus, Cylin- 
drella, Macroceramus, Pineria, Partula.' 
The genera whose jaw is in one piece with an accessory quad- 
rate piece are Succinea,® Omalonyx, Hyalimax,” Athoracophorus.” 
The genera whose jaw is in separate pieces are Orthalicus, 
Tiguus, and Punctum.” I have arranged the American genera in 
the same manner in the following pages. 
BIBLIOGRAPHY. 
The principal works referred to are :— 
Lerpy in Binney’s Terrestrial Air-breathing Mollusks of the 
United States. Boston, 1851, Little & Brown. The wood-cuts 
of lingual membranes are misplaced in the text. See the list, vol. 
II. p. 358. 
Binneéy and Buanp. Land and Fresh Water Shells of North 
America. Part I. Smithsonian Miscellaneous Contributions. 
Washington, 1869. 
Morse in Journal of the Portland Society of Natural History, 
1864. 
Moquin-Tanpon. Histoire Naturelle des Mollusques Terrestres 
et Fluviatiles de la France. Paris, 1855. 
Fiscumer et Crosse. Etudes sur les Mollusques Terrestres et 
Fluviatiles du Mexique et l’Amérique Centrale. Paris, 1874. 
LrHMANN. Die lebenden Schnecken und Muscheln der Umge- 
gend Stettins und in Pommern. Cassel, 1873. 
1 Morch, Journ. de Conch., 1865, 385. 
2 Crosse and Fischer, Journ. de Conch. 1870, pl. V., fig. 11, 12. 
2 |ollavngl ayacl IeiianEyy~, Ann, IOs IN[, lel, OF IN, Woy WO WGo JO ile Tilers, 
1, 5-7. 
“ IPROG, IME, AVG, IN IO, Ih jo WUD) ais 2 a, Os  JeANGanlKon 1G) e} 
synonym of this. 5 See this paper. 
6 Bland and Binney, Ann. N. Y. Lyc. N. H., X., 22. 
7 Binney, Ann. Lyc. N. H. of N. Y., XI. 45. 
8 See this paper. DWE EN, TIEN, D5 Ol, Won Tile, Gy eh 
10 Fischer and Crosse, Journ. de Conch. XY., 218, pl. X., figs. 5, 7. 
1 Bergh, verh. kais. keenig. zoolog. botan. Gesell. in Wien. XX. 844, pl. 
XII., fig. 2, 4, 5. 12 See this paper. 
