CONTENTS OF VOL V. 



No. T. JUNE, 1903 



PA<;K 



AXEL LEONARD MELANDER AND CHARLES THOMAS BRUES : 



Gi/esfs and Parasites of the Burrowing Bee Halictus i 



J. B. JOHNSTON: The Origin of the Heart Endotheliu m in Amphibia 28^ 



J. W. SCOTT : Periods of Susceptibility in the Differentiation of 



Unfertilized Eggs of Amphitrite t 35 



ARTHUR W. GREELEY : Further Studies on the Effect of Varia- 

 tions in the Temperature on A nimal Tissues 42 



BENNET M. ALLEN: The Embryonic Development of the Ovary 



and Testis of the Mammalia (Preliminary Account} 55 



No. 2. JULY, 1903 



HENRY LESLIE OSBORN : Bunodera corniita sp, nov. : A New 

 Parasite from tlie Crayfish and Certain Fishes of Lake 

 Chautauqua, N. Y. 63 



]. B. JOHNSTON : On the Blood Vessels, their Valves, and the 



Course of the Blood in Lumbricits 74 ' 



VERNON L. KELLOGG: Two New Genera of MaJlophaga 85 



FRANK R. LILLIE : Experimental Studies on tlie Development of 



the Organs in the Embryo of the Foivl ( Gallus domesticus} 92 > 



W. C. CURTIS : Cross obothrium laciniatuin and Developmental 



Stimuli in the Cestoda 125 ^ 



No. 3. AUGUST, 1903 



S. J. HUNTER : On the Conditions Governing the Production of 



Artificial Parthenogenesis in Arbacia 143 



ESTHEK F. BYRNES : Heterogony and Variation in some of the Copc- 



poda of Long Island. 152 



CASWELL GRAVE : On the Occurrence among Echinoderms of Larvce 

 with Cilia Arranged in Transverse Rings, with a Sugges- 

 tion as to their Significance 169 



iii 





