Contributions to Lycodon zawi, a little-known colubrid snake (Reptilia: Serpentes: Colubridae)

Since the original description of Lycodon zawi almost two decades ago from Myanmar and Northeast India, little is known on the systematics, distributional range as well as the natural history of the species. Hence, this paper attempts to contribute updated information to enhance the genetic data, morphology, distributional records, and natural history on its feeding and the hitherto unknown breeding habit of this species from Mizoram State, Northeast India.

XXI.—The Life-history and Development of Agriolimax agrestis L., the Gray Field Slug.

Among Gasteropod Molluscs the life-histories and development of the most highly evolved members, the terrestrial Pulmonates, have been less intensively studied than those of more primitive aquatic forms. This has been due in part to the technical difficulties involved in the permanent preparation of material for study, and in part to the fact that the investigator seeking for primitive features of phyletic interest is more likely to find these among more generalised species of Gasteropods than among those which are obviously adapted, both during the early stages of their development and in adult life, to a habitat far removed from the ancestral one.It is the purpose of this paper to present data bearing upon the life-history of a single species of land Pulmonate, Agriolimax agrestis L., to enlarge upon certain aspects of the embryology of this species, and to demonstrate the structural and functional changes of the larva which have accompanied the transition from an aquatic to a terrestrial breeding habit.