LYMN.ZIDA OF NORTH AMERICA. 449 
ANIMAL, JAw, RapuLa and GENITALIA: Not examined. 
RANGE: Idaho west to Oregon. A species of the Columbia River 
drainage (Columbian region) in the Transition life zone. 
RECORDS. 
IpAHO: Salmon River (Hemphill). 
Orecon: Willamette (Wahlamat) near its junction with the Columbia 
River, Columbia Co. (Lea; Nuttall). 
GEOLOGICAL DisTRIBUTION: Unknown. 
Ecotocy: Similar to that of apicina. 
REMARKS: Solida may be known by its somewhat oblique, acutely 
conic and imperforate shell, its wide and rather flat inner lip, its very 
solid shell and its somewhat patulous aperture. Students have gener- 
ally misunderstood this race (and this is not strange, since the figures 
and descriptions are poor and meager), confounding it particularly 
with decollata. The Michigan references to decollata were founded 
on apicina and the western references on the present race. The figures 
of solida and apicina have been very unfortunate. Haldeman’s are 
fairly good but Binney’s are very poor and one can scarcely believe that 
the figure given by him and the photograph of the type in this mono- 
graph (pl. XLVIII, fig. 2) are intended to illustrate the same speci- 
men. Solida differs from apicina in its more elongated spire, closed 
umbilical region, less tumid whorls, more oblique shape, patulous aper- 
ture and less acute columellar plait. It does not seem to be common 
and only one lot, besides the type, has been seen. 
Notwithstanding the fact that Lea described solida on an earlier 
page than apicina, the writer has deemed it best to consider the earlier 
name a race of the later species. 
Galba hinkleyi (Baker). Plate XLVII, figure 31-35, 
Lymnea hinkleyi BAKer, Nautilus, XIX, p. 142, April, 1906. 
?Limnea catascopium Hatp., Mon. Lim., p. 8, pl. 14, fig. 4, 1842 
SHELL: Varying from ovate to globose, very thin; color of per- 
iostracum light greenish-horn; surface dull to slightly shining, rough, 
the growth lines uneven and raised at intervals to form fine ridges; 
the surface is sometimes malleated and occasionally ornamented by five 
or six heavy spiral ridges; fine impressed spiral lines present and very 
marked in some specimens; whorls 5, rounded, tumid in some speci- 
mens, the last whorl globose; spire of variable length, but generally 
shorter than the aperture, broadly conic; sutures well impressed ; aper- 
ture roundly ovate, not expanded, acutely narrowed at the posterior 
angle; outer lip thin with an internal longitudinal varix; inner lip very 
