VOL. XXXIII, No. 395 NOVEMBER, 1899 
THE 
AMERICAN 
NAPURALIST 
A MONTHLY JOURNAL 
DEVOTED TO THE NATURAL SCIENCES 
IN THEIR WIDEST SENSE 
CONTENTS 
PAGE 
I. The Wings of Insects. V. . . J.H. COMSTOCK and J. G. NEEDHAM 845 
II. A Contribution to the Morphology of Pennaria tiarella McCrady 
MARTIN SMALLWOOD 861 
III. Reversal of Cleavage in Ancylus 5. J. HOLMES 871 
IV. Synopses of North-American R Y: " Fresh-Water 
Ostracoda . C.H. TURNER 877 
V. Reviews of Recent Liseraturs: Sonera olay: Nimi Science and Phi- 889 
losophy — Zoölogy : Emery’s Zoölogia, Jordan’s Manual of Vertebrates, 890 
Envelopes of the Spinal Cord, Origin of Mammals, Placenta of Tarsius 
and of Tupaja, Uterus masculinus of the Rabbit, Fossil Hyracoid, 
Bipedal Lacertilia, Lateral Fins of Fishes, Chiasma of the Optic Nerves, 
Eigenmann on the Blind Fish of the Caves, Abbott on the Marine Fishes 
of Peru, Fishes of French Guiana, Australian Tunicata, The Coccidæ of 
Mauritius, The Corpora allata of the Orthoptera, Systematic Position 
of the Fleas, The Sting of the Hymenoptera, Nematodes, Movements 
of Pseudopods, Notes — Botany: Colors of Flowers, The Teaching 905 
Botanist, Massee’s Plant Diseases, Hough’s American Woods, Notes — 
Paleontology: Fossil Medusæ — Petrography and Mineralogy : The Char- 910 
acters of Crystals, First Appendix to Dana’s Mineralogy 
VI. News 913 
VII. Publications Received 915 
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