OF NORTH AMERICA. 259 



known from modicella by the greater obesity of the body whorl, which 

 produces* a more acutely conic spire. 



Say's types are like the two specimens figured on plate XXIX. 

 The species is not well figured by either Binney or Haldeman, the 

 former not showing well the obese character of the body whorl, while 

 the latter does not well illustrate the conic, turreted spire. The figures 

 on the plate, from specimens in the collection of Mr. Bryant Walker, 

 show well the rotund whorls. Mr. William G. Mazyck, of Charleston, 

 South Carolina, sent several specimens to the writer, which are figured 

 on plate XXX. The New Jersey record is somewhat of a surprise; 

 the specimens, however, are quite typical. Humilis has been made to 

 embrace almost all of the small forms of the Lymnseas in the United 

 States, as many as eight species being included under this all-embracing 

 name. As species go in Lymnaea, these are well characterized and 

 easily known when attention is given to the details of structure. 



Galba humilis modicella (Say). Plate XXIX, figures 31-37; 

 plate XXXI, figures 1-9. 



Lymnaus modicellus SAY, Journ. Phil. Acad., V, p. 122, 1825 ; Binney's Ed., 

 p. 113, 1858. 



Lymncea modicella GOULD, Lamarck's Genera, p. 69, 1833. WHEATLEY, 

 Cat. Sh. U. S., p. 23, 1843. SCUDDER, Bull. Nat. Mus., 23, p. 201, 1885. WALKER, 

 Ottawa Nat., XXII, p. 91, 1908. 



Lymnaa modicellus LINSLEY, Amer. Journ. Sci., XLVIII, p. 283, 1845. 



Lymncea humilis var. modicella, JAY, Cat., p. 269, 1852. 



Lymnaa humilis modicelle BERRY, Nautilus, XXIV, p. 62, 1910. 



Lymnea modicellus DEKAY, An. N. Y., p. 32, 1839. GIRARD, Proc. Nat. Inst, 

 I, No. 2, p. 81, 1856. CURRIER, Sh. Grand River, Mich., 1859. 



Limnca modicellus HALD., Mon. Lim., p. 42, pi. 13, figs. 2-8, 1842. TRUE, 

 Proc. Essex Inst., II, p. 195, 1857. TUFTS, Cat. Sh. Mass., p. 87, 1859. MILES, 

 Geol. Surv. Mich., 1860, p. 237. 



Limncea modicellus GOULD, Invert. Mass., p. 218, fig. 151, 1841. PRESCOTT, 

 Cat. Sh. M,ass., No. 197, 1842. READ, Cat., 1843. RUSSELL, Journ. Essex Co. 

 Nat. Hist. Soc., p. 130, 1852. CURRIER, Kent. Sci. Inst., Mis. Pub., No. 1, 1868. 



Limncea modicella BELL, Geol. Surv. Can. Rep. Prog., p. 252, 1859. BIN- 

 NEY, Land and F. W. Sh. N. A., II, p. 64, fig. 100, 1865. TRYON, Amer. Journ. 

 Conch., Ill, p. 196, 1867. SOWB., Conch. Icon., XVIII, sp. 83, pi. 12, fig. 83, 

 1872. CLESSIN, Mai. Blaitt., n. s., Ill, p. 81, 1881. JORDAN, Nova Acta Ksl.-Leop. 

 Carol. Deutsch Akad. Natur., XLV, p. 367, 1883. CKLL., Journ. Conch., VI, p. 

 61, 1889. SINGLEY, An. Rep. Geol. Surv. Texas, IV, p. 188, 1892; p. 313, 1893. 



Lymnaa desidiosa var. modicella BAKER, Nautilus, XVIII, p. 127, 1905. 

 LERtoOND, Shells of Maine, p. 38, 1908. 



Lymncea desidiosa modicella STERKI, Proc. Ohio State Acad. Sci., IV, p. 

 382, 1907. 



