$4.00 pv 
40 cts. per Copy. 
THE 
/IMERICAN 
NATURALIST 
A MONTHLY JOURNAL 
DEVOTED TO THE NATURAL SCIENCES 
IN THEIR WIDEST SENSE. 
Vol. XXIII. DE CEMBER, 1889. ^° "^6 
CONTENTS. 
Zooir^y.-The Fauna of the Mis: 
Baur, 1039 I Neomenoidca— The Classification 
i Dolphins-The Relationship of the G^^nus ^'^^^^ 
Joseph F.James, 1071 oenerai ; L k 
L-ntific RcFearch in University of F>enna. \ Ha'rvest-Spid'er [Illustrated]- "'"' 
um Curculio— The 
Louse-Our Injurious .4=:gerians [lUustni 
itic Castration of TypIocylxK-l'.niomoi. 
d Pftr.x^aphy. — Petrographical | _vTg^.j._ ^ . 
ical News 1089 !* 
icai .-sews, .... , ^^^^^^^^^^ 
K Genus of .\lgaj— The Collecting j 
PHILADELPHIA: 
FERRIS BROS., PUBLISHERS 
S 1 X T I 
JD ARC 
H STREETS 
