$4-00 per Year. 40 cts. per Copy. 
THE 
/[MERICAN 
Naturalist 
A MONTHLY JOURNAL 
DEVOTED TO THE NATURAL SCIENCES 
IN THEIR WIDEST SENSE. 
Vol XXIII. NOVEMBER, 1889. No. 
275 
CONTENTS. 
U-.LK. i-s-oFR THr S^vrv ^O.RAI Strxvd ^ 
Zoology.— kn\m7>X Coloring Matter-Tne Poly- 
F H Her,ick Ph D 
941 noina-Reproduction of F.shes-The Halosauro.d 
ThK ETIOL .OIC.L (^I AsM.ir.IK.VOP Dl.lUSKS. 
Fishes Typical of a Special Order-The Notacanthid 
^56 Fishes as kepresentativea of a Peculiar Order-Note 
t 
^"B SILVER LAKl. ,.K OREOOV^.ND ITS RKUmN-.' 
i Zoological News: Sponges-Worms-Verlebratcs, 
I0I4 
[Illu..] E. D. Cope, 
Character and Distribution of the Genera 
OF Brachiopoda Charles W. Rolfe. 
^° i Embryology.-^^o\MUo^ of the Medullary Canal. 
„a, 1 Archeology and Ethnology.— Tha .Accessions to 
''' the Museuf of .be Peabody Academy of Saence. 
IOI9 
1 of Salem, Mass 
IJr .h J J. Valentine on the Portuguese Discovery 
. Entomology.-V^t:\mn.3.Ty Catalogue- of and Notes 
onNebraskaButterfl.es 
^ 1 Psyckolcgy.-'U.. Devices of Cnm.nais m ind.a - 
° \^-^^ta!i— Schroeter's Fungi of Silesia— The Sci- 
io»4 
^^NERAL Notes. 
to,, 
'^^''•"-^•''.-v and /'^/r^^d/Ajj'. — IVtroKraphical 
. C ,. - -' 'T-T-^ 
I0T3 
- ralogical N.ws-Meteor.te. 
- I he Fresh-water Aig.e of the P'.-.r.^. 
_ -. 
™„ 
PHILADELPHIA: 
FERRIS BROS., PUBLISHERS 
SIXTH AJ^D ARCH S TREETS 
