i894- 
107 
fWoodwortli 
EXPLANATION OF PLATES. 
Plate 3. 
L Evotomys ciapperi (Vig.) ? No. 1983. Peterboro, N. Y., Oct. 11, 
1893. 
2. Arvicola riparhis Ord. Topo-type. Near Philadelphia, Pa. 
3, 4. Arvicola chrotorrhiitus Miller. Type. 
5, 6. Arvicola xanthognathus Leacli. 5 ^o- 2555. Yukon River, 
Alaska. 
(All figures about X |.) 
Plato. 4. 
1. Arvicola riparius Ord. Topo-type. 
a. Left maxillary molar series. 
b. " mandibular " " 
2. Arvicola chrotorrhinus Miller. Type. 
a. Left maxillary molar series. 
h. " mandibular " " 
3. Arvicola xanthognathus Leach. No. 2555. 
a. Left maxillary molar series. 
b. " mandibular " " 
(All figures about X 10.) 
SOME TYPICAL ESKERS OF SOUTHERN NEW ENG- 
LAND. 
BY J. B. WOODWORTH. 
^Published by jyermissioii of the Director of the U. S. Geological 
Survey.'] 
Contents. 
Introduction 
Terminology 
Bibliographic resume 
The slopes of eskers 
The crest-line of eskers 
The direction of eskers 
Easting and westing of eskei 
The lines of an esker 
Significance of the cross-section of eskers 
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