BIOLOGICAL BULLETIN 



nDarine Bioloaical Xaboratoric! 



WOODS H0L£, MASS. 



Vol. XXVIII April, 1915 No. 4 



CONTENTS 



PACE 



WoOLSEY, Carrie I. Linkage of Chroinosomes Correlated 



'ivith Redact ion in JSftinlbers Among 

 the Species of" a Gcnits ^ also Within 

 a Species of the L ociistidce 163 



Sm^EE, A. Fkaxkein. Periodicity in the Proditction of Males 



in Hydatina: senta 1S7 



Lex'J'ox, Edwin. Note o?i Preunrtode Sporocysts and 



CercaricE in Marine JMollusks of 

 the Woods Hole Region 198 



Fhipps, C. F. An Experimental Study of the Beha- 

 vior of Am phi pods zvith Respect to 

 Light 1)1 tensity Direction of Rays 

 and JMetabolism .... .. 310 



EwiXG, H. E.- A Case of Persistent Melanism 324 



LiLEiE, Frank R. Stitdies of Fertilization. VII 339 



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