388 Binney's Monograph of the Helices 
the next species.* Plate XIX., fig. 1, represents 
the mature shell; fig. 2, the young shell descHibed 
by Say, as P. avara. 
26. HELIX FATIGIATA. 
. Plate XIX. fig. 3. 
H. testa sub-planulatà, umbilicatà, Iuteo-corneá ; anfractibus striatis, 
striis distinctis, crebris, elevatis; aperturà sub-orbiculari, contracta ; 
labro albo, reflexo, intus iden tats’; ; columella plicd sub-acutà in 
medio aperture projectà. ; 
SYNONYMS AND REFERENCES. 
Polygyra plicàta, Say. Journ. A. N. S. | Philad, 
IL 161. Nich. Encyc., Am. edit., Vol. IV. 
Polygyra fatigiàta, Say. Disseminator of Useful 
Knowledge, 1829. 
Polygyra Dorfeuillana, Lea. Trans. Am. Phil Soc. 
VI. 107. Pl. xxxv., fig. 118 
Polygyra Troostiana, Lea. Toidem, VL 107. Ex l 
xxiv., fig. 119. 
DESCRIPTION. 
Animal. Not hitherto noticed. - 
Shell. Plane above or a little convex ; <; epidermis 
light russet ; whorls more than five, with numerous 
raised, ilidnes equidistant striae; aperture shaped 
like a horseshoe; lip equally reflected, regularly 
arcuated, describing two thirds of a circle, with @ 
depression behind its reflection ; within the aperture, 
* Bulletin ARTENE 2d Seet., p. 85. 
