OF NORTH AMERICA. 257 



found in the cabinets of western conchologists reposing under the name 

 of Lymn&a humilis. 



Galba humilis (Say). Plate XXIX, figures 26-30; plate XXX, 

 figures 19-20. 



Lymncus humilis SAY, Journ. Phil. Acad., II, p. 378, 1822; Binney, Re- 

 print, p. 110, 1858. 



Lymnaa humilis GOULD, Lamarck's Genera, p. 69, 1833. JAY, Cat., Ed. IV, 

 p. 269, 1852. REEVE, Elements of Conch., p. 179, I860. BALL, Alaska Moll., 

 p. 73, fig. 50, 1905 (part). HENDERSON, Univ. Colo. Studies, IV, fig. 33, 1907. 



Limnaza humilis BINNEY, Check List, p. 12, 1860 ; Land & F.-W. Sh. N. A., 

 II, p. 63, fig. 99, 1865. GOULD, Invert. Mass., Binney's ed., fig. 151, 1870. SOWB., 

 Conch. Icon., XVIII, Limn., sp. 78, pi. 12, figs. 70, a, b, 1872 (the figures are 

 scarcely characteristic). TRYON, Con. Hald. Mon., p. 105 (79), 1872 (part). 

 CLESSIN, Mai. Blatt., n. s., I, p. 27, 1879 (part) ; III, p. 81, 1881 (part). 



Limnea humilis HALD., Mon. Limn., p. 41, pi. 13, fig. 1, 1842. DEKAY, 

 Zool. N. Y., p. 71, 1843 (part). 



Limnophysa humilis BECK, Index, p. 112, 1837. TRYON, Amer. Journ. 

 Conch., I, p. 256, 1865 (part). HARTMAN and MICHENER, Conch. Cestrica, fig. 

 126, 1874. CALL, An. Rep. Dept. Geol. Nat. Res. Ind., XXIV, pi. 8, fig. 9, 1899. 



Limnaus humilis GIBBS, App. Geol. So. Car., p. XX, 1848. KUSTER, Conch., 

 Cab., p. 51, taf. 11, figs. 15, 16, 17, 18, 1862 (figures are not typical). 



SHELL: Small, ovate-conic; periostracum light yellowish horn; 

 surface shining, sometimes polished; lines of growth crowded, promi- 

 nent ; spiral sculpture absent or but slightly indicated ; apex as in Galba 

 humilis modicclla; whorls 5-5^, convex, rather rapidly increasing in 

 diameter, the body whorl quite obese; spire conic, turreted, about as 

 long as the aperture ; sutures well impressed ; aperture ovate or roundly 

 ovate ; peristome lip thin ; inner lip reflected to form a narrow, some- 

 what triangular expansion which may be rolled in toward the umbilical 

 chink or stand more or less erect ; umbilical chink small and narrow, 

 emarginated by the inner lip ; parietal callus well marked ; axis smooth, 

 forming a column as in Galba cubensis. 



Length. Breadth. Aperture length. Breadth. 

 8.50 4.50 4.50 2.50 mill. Say's type. 



8.50 5.00 " 



6.00 3.50 2.75 2.00 " Charleston, S. C. 



6.00 3.75 3.00 2.00 " 



8.00 4.75 4.50 2.50 " (Walker Coll.) 



8.00 4.50 4.00 2.25 " 



TYPES: Academy of Natural Sciences, Philadelphia, two speci- 

 mens, No. 58754. 



TYPE LOCALITY : South Carolina. 



ANIMAL, JAW, RADULA and GENITALIA: Not examined. 



RANGE (Figure 24) : Southeastern United States. So far as at 

 present known, humilis is confined to the Upper and Lower Austral 



