LYMNZEIDZ OF NORTH AMERICA. 175 
Type: One specimen. Lea Colln., Smithsonian Institution No. 
118670. 
Tyre Locauity: Poland, Ohio. 
ANIMAL: - Not seen. 
Jaw, RapuLa AND GENITALIA: Not examined. 
RANGE: The range of variety casta is unsatisfactorily known, 
owing probably to its being confused with typical columella. In view 
of this fact, generalities must be dispensed with. It is not known at 
present outside of Illinois, Indiana and Ohio, and is hence confined 
entirely to the Upper Mississippian region and drainage, and to the 
humid division of the Upper Austral life zone. 
RECORDS: 
UNITED STATES. 
Ittrnots:—Mercer Co. (Marsh). 
INDIANA: La Porte, La Porte Co. (Daniels); Bass Lake, Starke Co. 
(Daniels; Woodruff). 
Onto: Poland, Mahoning Co. (Lea); Kent, Portage Co. (Dean, Sterki; 
Walker). 
GEOLOGICAL RANGE: Unknown. 
Ecotocy: Similar to columella. 
REMARKS: Casta may be distinguished from chalybea by its very 
narrow, elongated, somewhat oblique shell, pointed spire, long and 
narrow aperture and particularly by its almost straight inner lip margin 
(Compare' fig. 13 with fig. 14). The shells from Bass Lake contain 
an occasional specimen which has the chalybean form of aperture, but 
this is rare, the majority of specimens conforming closely to the casta 
type with an almost straight inner lip margin. This variety is one of 
the most beautiful of the columella group; the color is a rich, shining 
yellowish horn and the surface is marked by raised growth lines, which 
are crossed by fine impressed spiral lines, giving the surface the appear- 
ance of engraved steel. Were it not for the presence of occasional 
intermediate forms, this variety might be raised to specific rank. 
Lea gives six whorls in his description, but his type specimen does 
not show this number, nor do any of the Bass Lake specimens. It is 
probable that both variety casta and variety chalybea have been in- 
cluded in some of the records of columella, but this cannot be deter- 
mined without an examination of the original specimens, which is quite 
impossible in most instances. 
Pseudosuccinea columella championi (Von Martens). Plate 
XXIV, figure 20. 
Limnea columella var. championi Martens, Biol. Cent. Amer., Moll., 
p. 379, pl. 19, fig. 12, 1899. 
