CON LENT S. 
CONTRIBUTIONS FROM THE ZOOLOGICAL LABORATORY OF THE 
MUSEUM OF COMPARATIVE ZOOLOGY AT HARVARD 
COLLEGE, UNDER THE DIRECTION OF E. L. MARK. 
PAGE 
No. 1. — Changes accompanying the Migration of the Eye and Observations 
on the Tractus Opticus and Tectum Opticum in PSEUDOPLEURONECTES 
AMERICANUS. By STEPHEN R. Wituiams. (5 Plates.) May, 1902 . . | 
No. 2.— The Early Development of Lepas. A Study of Cell-Lineage and 
Germ Layers. By Maurice A. Bicgetow. (12 Plates.) July, 1902. . 659 
No. 8.— The Development of the Definitive Feather. By R. M. Srrona. 
(ates) MOCCODEr LOL! saa) py. oe Rae Pech Se a ee AB 
No. 4.— The Heredity of Sex. By W.E. Castte. January, 1903. . . . 187 
No. 5. — The Optic Chiasma in TELEosts and its Bearing on the Asymmetry 
in the HereRosomata (Flatfishes). By G. H. Parker. (1 Plate.) Jan- 
ENERO OT NRCS) Solos. Crotakh ics Wise ch all ha laeelin Core ke Wa ot eh (ore ee eal 
No. 6. — Ponypacry.ism in Man and the Domestic Animals, with especial 
reference to Digital Variation in Swine. By C.W. Prentiss. (22 Plates.) 
PPL e. cad testa si je: As) ac ie Peet a) se Wee See ay nse pata bel her cm we eee 
No. 7.— The Changes which occur in the Muscles of a Beetle, TuoymaLus 
MARGINICOLLIS CHEvR., during Metamorphosis. By Rosperr S. Breep. 
Hirplates:):. Oetoner.- L905 tr We are te eel Meepie: e ule Nata as a he OLD 
