CONTENTS 



No. 1. JUNE 



George T. Hargitt. Germ cells of coelenterates. V. Eudendrium ramo- 



sum. Nineteen figures 1 



Charles Eugene Johnson. The branchial derivatives of the pied-billed 



grebe, with special consideration of the origin of the postbranchial body. 



Thirteen figures 25 



A. C. Walton. Longitudinal fission in Actinia bermudensis Verrill. Eight 



figures 43 



Thurlow C. Nelson. On the origin, nature and function of the crystalline 



style of lamellibranchs. Seventeen figures 53 



N. E. McIndoo. The olfactory organs of a coleopterous larva. Thirty-three 



figures 113 



Ezra Allen. Studies on cell division in the albino rat (Mus norvegicus, var. 



alb.) III. Spermatogenesis: the origin of the first spermatocytes and 



the organization of the chromosomes, including the accessory. Fifty-eight 



figures 133 



E. H. NoRRis. The morphogenesis of the thyreoid gland in Squalus acanthias. 



Twenty-three figures 187 



No. 2. SEPTEMBER 



Edith Pinney. A study of the relation of the behavior of the chromatin to 



development and heredity in teleost hybrids. Eighty-eight figures 225 



H. V. Neal. Neuromeres and metameres. Seventeen text-figures 293 



Stephen G. Rich. The gill-chamber of dragonfly nymphs. Forty-eight figures 317 



No. 3. DECEMBER 



James Rollin Slonaker. A physiological study of the anatomy of the eye and 

 its accessory parts of the English sparrow (Passer domesticus). Thirty- 

 seven text-figures and twelve plates 351 



Sydney E. Johnson. Osteology of the gruntfish, Rhamphocottus richardsoni. 



Twenty figures 461 



H. W. NoRRis AND Sally Hughes. The cranial and anterior spinal nerves of 

 the caecilian amphibians. Forty-five figures 489 



E. H. DusHAM. The wax glands of the cockroach (Blatta germanica). Eleven 



figures 563 



Charles Eugene Johnson. The origin of the ultimobranchial body and its 



relation to the fifth pouch in birds. Two text-figures and two plates 583 



R. W. Shufeldt. Notes on the osteology of the young of the hoatzin (Opis- 

 thocomus cristatus) and other points on its morphology. Eight figures. . . 599 



iii 



