Publisher's Synopsis
Excerpt from The Journal of Experimental Zo�logy, 1917, Vol. 23
It has been shown by various authors whose work will be brie?y reviewed? That protandric hermaphroditism is common in that group of Prosobranch Molluscs known as the Calyptraeidae, the animals functioning as males during the early part of their lives and as females during the later part. The male and female phases are connected by a transitional period. It was sug gested to the writer by Prof. E. G. Conklin in 1913 that if a de tailed histological study were made of the development and history of the gonad in these protandric hermaphrodites, new facts might come to light bearing on the early differentiation of the male and female germ cells, and perhaps on other questions relating to hermaphroditism. Those curious structures found in the testis of so many Prosobranchs, known as the atypical Spermatozoa, are also of interest in this connection. The prob lem has opened up even more possibilities than could have been anticipated, and I take this occasion to express my thanks to Professor Conklin for his suggestions and constant oversight of the work.
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