LYMNAZIDA OF NORTH AMERICA. 353 
and 9) are excellent and answer exactly to Gould’s description. These 
are almost identical with the figures on plate XXXVII, which il- 
lustrate the range of variation. Binney’s figure of kirtlandiana bears 
some resemblance to /anceata but quite correctly typifies kirtlandiana 
in which the whorls are more oblique, a feature absent in lJanceata. 
Tryon’s figure in his continuation of Haldeman’s Monograph, is very 
poor and looks more like a form of exilis than lanceata. (Hald. pl. 
18, ne: 11): 
Lanceata is liable to be confused with three forms of Lymnza; 
exilis, which has a longer spire with more flat-sided oblique whorls, 
a narrower, more oblique aperture and a twist like that of reflexa; 
immature reflexa, which differs in the form of the penultimate whorl 
(which is disproportionately enlarged) and in the shape of the aperture, 
which is slightly oblique and reflexed; and elodes, which has a wider 
shell, wider spire whorls and a rounder aperture. With reasonable 
care there ought to be no difficulty in distinguishing Janceata from all 
related species. The spire whorls are only slightly oblique, notwith- 
standing the fact that Gould says in his description “quite oblique.” 
The rectangular shape of the aperture and the flatly cylindrical form 
of the body whorl, will aid much in distinguishing lanceata. 
Galba attenuata (Say). Plate XX XVII, figures 23, 24. 
Lymneus attenuatus Say, New Harm. Dis., II, p. 244, 1829; Binney’s Ed., 
p. 148; Discr., p. 23, 1858. 
Lymnea attenuata Jay, Cat., Ed. 4, p. 268, 1852. 
Limneus attenuatus Kuster, Conch. Cab., p. 39, taf. 7, fig. 8, 1862. 
Limnea attenuata Hatp., Mon. Lim., p. 28, pl. 9, figs. 1-5, 1842—DeEKay, 
ZOGIENESY., Pp. 15; 1843. 
Limnea attenuata BINNEY, Check List, p. 12, 1860; L. & F. W. Sh. N. A,, 
II, p. 42, fig. 53, 1865; Journ. de Conch., XV, p. 427, 1867—Sows., Conch. Icon., 
Lim., XVIII, pl. 13, fig. 32 c, 1872—Tryon, Con. Hald. Mon., p. 95 (69), 1872.— 
STREBEL, Ab. Natur. Ver., Hamb., VI, p. 57, taf. 5, figs. 32, 32 a, 1873—Pirspry, 
Proc. Phil. Acad., 1891, p. 320—Cr. & Fiscu., Miss. Scient. Mex., Moll., I, taf. 
27, figs. 11, 11, a, b, II, p. 49, 1880-——Baxer, Nat. in Mexico, p. 103, 1895.—Mar- 
TENS, Biol. Cent. Amer., Moll., p. 375, 1899.—Pitspry, Proc. Phil. Acad. 1903, 
p. 776. 
Leptolimnea attenuata Tryon, Amer. Journ. Conch., 1, p. 257, 1865. 
Omphiscola pugio Beck, Index Moll., p. 110, 1837 (sine descr.). 
Limnea emarginata Sows. (non Say), Reeve’s Conch. Icon., XVIII, 
Limnea, pl. 6, fig. 35, 1872. 
Limneus turritus PuHivrprr in coll. Dunker (vide Martens). 
Limneus mexicanus Z1EGLER, in coll. Dunker (vide Martens). 
Limneus subulatus DUNKER in Kuster, Conch. Cab., Ed. 2, p. 24, taf. 4, 
fig. 24, 1862—Von Martens, Mal. Blatt., XII, p. 58, 1865—Cressin, Mart. & 
CHEMN., Conch. Cab., p. 395, taf. 16, figs. 1, 2, 1886. 
