176 THE CHICAGO ACADEMY OF SCIENCES. 
Limnea columella Coorrer, Proc. Cal. Acad. Sci., ii, V, p. 168, 1895.—Pis- 
BRY, Proc. Phil. Acad., p. 776, 1903. 
Limnea macrostoma Martens, Biol. Cent. Amer., Moll., p. 379, 1899. 
“SHeLtL: Oblong-ovate, thin, irregularly striate, fawn-colored; 
whorls four, moderately increasing, the upper ones very convex, the 
last oblong, less convex ; aperture very slightly oblique, occupying two- 
thirds of the whole length, narrowly oval, not very acute above; its 
outer margin not much arcuated; basal margin rounded; columellar 
margin almost vertically ascending, thin, triangularly reflexed above, 
having a small umbilical slit in some specimens.” ( Martens.) 
Length. Breadth. Aperturelength. Breadth. 
12.00 6.00 8.00 4.00 mill. (Martens). 
13.50 8.00 9.00 5.00 “ ze 
16.00 8.00 10.00 6.00 “ (Coll. Walker). 
Types: Location not ascertained. ‘ 
Type Locarity: Bigabo, South Panama. 
ANIMAL, JAW, RADULA AND GENITALIA: Unknown. 
RANGE: Central America and Mexico. Variety championi ap- 
pears to be a race of the tropical life zone. It undoubtedly inhabits 
a large part of Central America, but records are wanting, except from 
two localities : 
MEXICO, 
Tepic: Tepic (Cooper). 
Micuoacan: Lake near Urupam (Rhoads; Pilsbry; Walker). 
Mexico: Mexico (Von Martens; Dr. Berendt). 
CENTRAL AMERICA. 
NicARAGUA: Palvon (Walker). 
PANAMA: Bigabo, South Panama (Martens; Champion). 
GEOLOGICAL RANGE: Unknown. 
Ecotocy: Not recorded. 
REMARKS: Championi is a form in which the spire is sharply 
attenuated, the aperture is gracefully rounded as in typical columella 
and the columella has the chalybea-like excavation, although Martens 
describes the columellar margin as “almost vertically ascending,” a 
feature not shown in specimens from Central America or in the orig- 
inal figure. It is not as compressed as casta and also lacks the obliquity 
of that race. This race will undoubtedly prove to be a widely dis- 
tributed form in Central America when that region is more thoroughly 
explored. The Mexican references of Cooper and Rhoads seem to 
be referable to this race. 
Pseudosuccinea francisca (Poey). Plate XXIV, figure 21. 
Limnea francisca Pory, Mem. Hist. Nat. Cuba, II, p. 32, 1858.—Prr., Mal. 
Blatt, V, p. 11, 1858—Aranco, Rep. Fisico-Nat. Cuba, I, p. 137, 1865; II, p. 87, 
1866.—CrosseE, Journ. de Conch. XXXVIII, p. 260, 1890. — 
