TABLE OF CONTENTS. 



PAGE 



I. SEITARO GOTO : The Craspedote Medusa Olindias and some of its Natural Allies. (Plates I-II1.) 1 



II. HENRY S. PRATT: Descriptions of four Distomes. (Plate IV.) 23 



III. WILLIAM A. LOCY : A New Cranial Nerve in Selachians. (Plates V-VI.) 39 



IV. JACOB REIGHARD: The Natural History of Aniia calva Linnaeus. (Plate VII.) 57 



V. CHARLES A. KOFOID: On the Structure of Protophrya ovicola, a Ciliate Infusorian from the 



Brood-sac of Littorina rudis Don. (Plate VIII.) Ill 



VI. C. B. DAVENPORT: A Comparison of some Pectens from the East and the West Coasts of the 



United States. (Plate IX.) 121 



VII. GERTRUDE CROTTY DAVENPORT: Variation in the Number of Stripes on the Sea-anemone, 



Sagartia lucise. (Plate X.) 137 



VIII. FRANK W. BANCROFT: ^Estivation of Botrylloides gascoi Delia Valle. (Plate XI.) 147 



IX. CARL H. EIGENMANN: The Eyes of the Blind Vertebrates of North America. V. The His- 

 tory of the Eye of the Blind Fish Amblyopsis from its Appearance to its Disintegration in 



Old Age. (Plates XII-XV.) 167 



X. HERBERT PARLIN JOHNSON: Fresh-water Nereids from the Pacific Coast and Hawaii, with 



Remarks on Fresh- water Polychseta in General. (Plates XVI-XVII.) 205 



XI. HENRY R. LINVILLE: The Natural History of some Tube-forming Annelids (Amphitrite ornata, 



Diopatra cuprea) 225 



XII. WILLIAM E. RITTER: The Structure and Affinities of Herdmania claviformis, the Type of a New 



Genus and Family of Ascidians from the Coast of California. (Plates XVIII-XIX.) 237 



XIII. R. M. STRONG: The Metallic Colors of Feathers from the Sides of the Neck of the Domestic 



Pigeon. (Plate XX.) 263 



XIV. C. R. EASTMAN: On the Nature of Edestus and Related Forms. (Plate XXI.) 279 



XV. H. V. NEAL: The Development of the Ventral Nerves in Selachii. I. Spinal Ventral Nerves. 



(Plates XXII-XXIV.) 291 



XVI. H. S. JENNINGS: Asymmetry in certain lower Organisms, and its Biological Significance 315 



XVII. ROLFE FLOYD: A Contribution to the Nervous Cytology of Periplaneta orientalis, the Common 



Cockroach. (Plates XXV-XXVIII.) 339 



XVIII. ROBERT MEARNS YERKES : Reactions of Daphnia pulex to Light and Heat 359 



XIX. W. E. CASTLE and GLOVER M. ALLEN : Mendel's Law and the Heredity of Albinism 379 



XX. PORTER EDWARD SARGENT: The Torus longitudinalis of the Teleost Brain: Its Ontogeny, 



Morphology, Phylogeny, and Function. (Plate XXIX.) 399 



XXI. THOMAS G. LEE: Implantation of the Ovum in Spermophilus tridecemlineatus Mitch. (Plates 



XXX-XXXI.) 417 



XXII. JOHN H. GEROULD: Studies on the Embryology of the Sipunculidse. I. The Embryonal En- 

 velope and it Homologue. (Plate XXXII.) 437 



XXIII. G. H. PARKER: The Phototropism of the Mourning-cloak Butterfly, Vanessa antiopa Linn. 



(Plate XXXIII.) 453 



XXIV. IDAH.HYDE: The Nerve Distribution in the Eye of Pecten irradians. (Plate XXXIV.) 471 



XXV. HENRY B. WARD: On the Development of Dermatobia hominis. (Plates XXXV-XXXVI.) . . 483 



xiii 



