OF NORTH AMERICA. 365 



Galba tryonii (Lea). Plate XXXIX, figures 4-5. 



Lymncea traskii LEA, Proc. Phil. Acad., p. 113, 1864 (not of Tryon, 1863). 

 SCUDDER, Bull. Nat. Mus., 23, pp. 149, 201, 1885. 



Limnaa traskii TRYON, Con. Hald Mon., p. 102 (76), pi. 18, fig. 1, 1872. 



Limnophysa tryonii 'LEA' MS, TRYON, Amer. Journ. Conch., I, p. 251, 1863. 



Limncea tryonii RANDOLPH, Nautilus, IX, p. 102, 1896. KEEP, West. Amer. 

 Sh., p. 314, 1904. 



Lymnea tryoniana LEA, Journ. Acad. Nat. Sci., VI, p. 162, pi. 24, fig. 78, 

 1866; Obs., XI, p. 118, pi. 24, fig. 78, 1867. 



Limnea tryoniana CARLTON, Proc. Cal. Acad. Sci., IV, p. 51, 1869. 



Limnaa tryoniana COOPER, Proc. Cal. Acad. Sci., IV, p. 96, 1870. 



Lymnaa tryoniana SCUDDER, 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 5J^ 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 -mill. Lea's description. 



13.50 6.50 6.00 - 3.00 " Lea's type. 



16.50 7.25 8.00 3.75 " Vancouver, B. C. 



15.00 7.00 8.00 4.00 " 



15.50 7.50 8.50 4.00 " 



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 LOCALITY: 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. Tryonii 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 area 

 west of the Sierra Nevadas, when it is distinguished from palustris, 

 with which species it has been confused by nearly all recent students. 



