LYMNA:IDZ OF NORTH AMERICA. 365 
Galba tryonii (Lea). Plate XX XIX, figures 4-5. 
Lymnea traskii Lea, Proc. Phil. Acad., p. 113, 1864 (not of Tryon, 1863).— 
Scupper, Bull. Nat. Mus., 23, pp. 149, 201, 1885. 
Limnea traskii Tryon, Con. Hald Mon., p. 102 (76),. pl. 18, fied 1872: 
Limnophysa tryonti ‘Lea’ MS, Tryon, Amer. Journ. Conch., I, p. 251, 1865. 
Limnea tryonti RanvotpH, Nautilus, IX, p. 102, 1896—KerEr, West. Amer. 
Sh., p. 314, 1904. 
Lymnea tryoniana Lea, Journ. Acad. Nat. Sci., VI, p. 162, pl. 24, fig. 78, 
1866; Obs., XI, p. 118, pl. 24, fig. 78, 1867. 
Limnea tryoniana Cartton, Proc. Cal. Acad. Sci., IV, p. 51, 1869. 
Limnea tryoniana Cooper, Proc. Cal. Acad. Sci., IV, p. 96, 1870. 
Lymnea tryoniana Scupver, Bull. Nat. Mus., 23, pp. 149, 201, 1885. 
SHELL: Small, subfusiform or subovate, sometimes slightly 
elongated, thin, semi-transparent, rather inflated; periostracum very 
light yellowish horn; surface shining, marked by numerous close- 
set, even lines of growth which are crossed by heavy impressed spiral 
lines, giving the surface a_ peculiarly engraved appearance; nucleus 
very dark red; whorls 5% to 6, convex, rapidly increasing in diameter, 
the body whorl slightly convex; spire conic, acute, about as long as 
the aperture; sutures well marked but not deeply impressed, bordered 
below by a light band which is sometimes edged with dark purple, 
especially on the last whorl; aperture ovate to broadly ovate, with a 
broad, thick, brown-edged varix within; inner lip appressed to the 
umbilical region leaving a very small chink; callus on the parietal 
wall thin; columella with a sharp plait which gives the axis a slight 
twist. 
Length. Width. Aperture length. Width. 
14.00 6.50 eee .... mill. Lea’s description. 
13.50 6.50 6.00 3.00 “  Lea’s type. 
16.50 7.25 8.00 Syria ae Vancouver, B. C. 
15.00 7.00 8.00 vO ON be 9 
15.50 7.50 8.50 4.00 “ us a 
12.50 6.25 6.00 3.00 “ Lea’s cotype, Phil. Acad. 
Types: Smithsonian Institution, three specimens, No. 121470; 
cotypes, Academy of Natural Sciences, Philadelphia, No. 58514. 
Type Locatity: Arroya, San Antonio, Cal. 
ANIMAL, JAW, RADULA and GENITALIA: Not examined. 
RANGE: (Figure 43) Vancouver Island south to southern Cali- 
fornia, west of the Sierra Nevadas. Tyryonii is a species of the Transi- 
tion and Upper Austral (Upper Sonoran division) life zones. It is 
common to the Californian and Columbian regions. It is probable that 
this species will be found very commonly distributed over the areca 
west of the Sierra Nevadas, when it is distinguished from palustris, 
with which species it has been confused by nearly all recent students. 
