. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. OVULATION IN THE FOUR-TOED SALAMANDER, HEMIDACTYLIUM SCUTATUM, AND THE EX- TERNAL FEATURES OF CLEAVAGE AND GASTRULATION. K. R. HUMPHREY, DEPARTMENT OF ANATOMY, SCHOOL OF MEDICINE, UNIVERSITY OF BUFFALO. INTRODUCTION. Incidental to the collection of material for a study on the germ cells of Hemidactylium scut at um the writer brought to the labora- tory a female of this species which subsequently deposited a number of ova while under observation. The eggs laid proving fertile, the progress of cleavage and gastrulation was car
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. OVULATION IN THE FOUR-TOED SALAMANDER, HEMIDACTYLIUM SCUTATUM, AND THE EX- TERNAL FEATURES OF CLEAVAGE AND GASTRULATION. K. R. HUMPHREY, DEPARTMENT OF ANATOMY, SCHOOL OF MEDICINE, UNIVERSITY OF BUFFALO. INTRODUCTION. Incidental to the collection of material for a study on the germ cells of Hemidactylium scut at um the writer brought to the labora- tory a female of this species which subsequently deposited a number of ova while under observation. The eggs laid proving fertile, the progress of cleavage and gastrulation was carefully noted. Though the observations made cover but a very limited material, they serve to supplement the work of Bishop ('18) who begins his account of the development of Hemidactylium with the neural plate stage; moreover, ovulation in this species seems not to have been previously observed and reported. For these reasons the observations made are here reported, even though the limited material prevents consideration of but little more than the super- ficial features of cleavage and gastrulation. OVULATION IN Hemidactylium. The female on which these observations were made was cap- tured in the sphagnum bog on the shores of Mud Pond near Ithaca,1 the site of Bishop's discovery of the egg-laying habits of this species some years before. This particlar female was found in a sphagnum hillock together with two eggs, on the morning of May u, 1923. She was brought to the laboratory the afternoon of that day, and placed in a small glass dish of sphagnum, to- 1 This study was carried on in the laboratories of the Department of Histology and Embryology of Cornell University. The writer wishes to acknowledge the kindness of Dr. B. F. Kingsbury at whnsr suggestion the observations herein reported were undertaken. 307. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustratio
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
