Chas. D. Walcott, 
en ek 
4 Berns 
U. 8. Geological Survey. 
Mer 104. Vor’ xX XIIr FEBRUARY, 1887. 
Established by BENJAMIN SILLIMAN in 1818. 
THE 
C. D. WALCOTTs| 
AMERICAN 
JOURNAL OF SCIENCE. 
EDITORS 
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ASSOCIATE EDITORS 
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JOHN TROWBRIDGE, or Campriner, 
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' New Haven, 
Prorrssor GEORGE F. BARKER, or PHILADELPHIA. 
THIRD SERIES, 
VOL. XXXII. —[WHOLE NUMBER, CXXXIIL.] 
No. 194—-FEBRUARY, 1887. 
WITH PLATHS I TO IV. 
NEW HAVEN, CONN.: J. D. & HE. 8. DANA. 
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