Edited by George Howard Parker Contains bibliographies Goto, S. The craspedote medusa Olindias and some of its natural allies.--Pratt, H. S. Description of four distomes.--Locy, W. A. A new cranial nerve in selachians.--Reighard, J. The natural history of Amia calva Linnæus.--Kofoid, C. A. On the structure of Protophyra ovicola, a ciliate infusorian from the brood-sac of Littorina rudis Don.--Davenport, C. B. A comparison of some pectens from the east and the west coast of the United States.--Davenport, G. C. Variation in the number of stripes on the sea-anemone, Sagartia lucia.--Bancroft, F. W. Æstivation of Botrylloides gascoi Della Valle.--Eigenmann, C. H. The eyes of the blind vertebrates of North America. The history of the eyes of the blind fish Amblyopsis from its appearance to its disintegration in old age.--Johnson, H. P. Fresh-water nereids from the Pacific coast and Hawaii, with remarks on fresh-water Polychæata in general.--Linville, H. R. The natural history of some tube-forming annelids (Amphitrite ornata, Diopatra cuprea) Ritter, W. E. The structure and affinities of Herdmania claviiormis, the type of new genus and family of ascidians from the coast of California.--Strong, R. M. The metallic colors of feathers from the sides of the neck of the domestic pigeon.--Eastman, C. R. On the nature of Edestus and related forms.--Neal, H. V. The development of the ventral nerves in Selachii. Spinal ventral nerves.--Jennings, H. S. Asymmetry in certain lower organisms, and its biological significance.--Floyd, R. A contribution to the nervous cytology of Periplaneta orientalis, the common cockroach.--Yerkes, R. M. Reactions of Daphnia pulex to light and heat.--Caste, W. E., and Allen, G. M. Mendel's law and the heredity of albinism.--Sargent, P. E. The torus longitudinalis of the teleost brain: its ontogeny, morphology, phylogeny, and function.--Lee, T. G. Implantation of the ovum in Spermophilus tridecemilneatus Mitch Gerould, J. H. Studies on the embryology of the Sipunculidæ. The embryonal envelope and its homologue.--Parkes, G. H. The phototropism of the mourning-cloak butterfly. Vanessa antiopa Linn.--Hyde, I. H. The nerve distribution in the eye of Pecten irradians.--Ward, H. B. On the development of Dermatobia hominis