VoL. XXXIV, NO. 403” JULY, 1900 
THE 
AMERICAN 
NATURALIST 
A MONTHLY JOURNAL 
DEVOTED TO THE NATURAL SCIENCES 
IN THEIR WIDEST SENSE 
CONTENTS 
: PAGE 
I. Notes on a Species of Pelomyxa . . Professor H. V. WILSON 535 
II. A Remarkable Axolotl from North Dakota š Professor H. L. OSBORN 551 
III. The Female of Eciton Sumichrasti Norton, with Some Notes 
on the Habits of Texan Ecitons . . Professor W. M. WHEELER 563 
IV. On the Linnæan Genera Myrmecophaga and Didelphis . J. A. G. REHN 575 
V. Karpinsky's Genus Helicoprion. A Review .  . Dr. C. R. EASTMAN 579 
VI. Synopses of North-American Invertebrates. XI. The Cato- 
metopous or Grapsoid Crabs of North America MARY J. RATHBUN 583 
VII. Reviews of Recent — Anthropology, = and his Ancestor, Notes 593 
— Zoólogy, A Zoo d-Pacific, The Distribution 594 
of the Opilionide, , The Management and Diseases of the Dog, Studies 
on Hirudinea, The Resources of is Sea, * Les Oiseaux," Heliotropism 
of Cypridopsis, Notes — Botany, An Experimental Botany, Prant's 605 
Lehrbuch, * Lessons in Botany," ice Paleobotany, Cretaceous Plants, 608 
Fossil Cycads, The Yale Collection of Cycads, Fossils of the Nor- 
wegian North Polar Expedition, Rothamsted Experiments, Plants in 
Calcareous Tufa, Fossil Flora of the Cascade Range, iat of the Coal 
Layers of La Ternera — Paleontology, Notes on Fossil Fi 612 
VIII. News 613 
IX. Publications Received : m 
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