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Show 1905.] ON HORN-GROWTH IN A CASTRATED PRONGBUCK. 191 or abortive nodular growths in, the antlers, due to complete, or incomplete, castration ; also two Red Deer skulls (Cervus elaphus), showing congenital absence, or modification in the growth, of the antlers. The following papers were read 1. The Effects of Castration on the Horns of a Prongbuck (Antilocapra americano). By R. I. P o c o c k , F.L.S., F.Z .S ., Superintendent of the Gardens. [Received February 21, 1905. (Text-figures 28 & 29.) The Zoological Gardens recently received on deposit an adult male Prongbuck remarkable for the abnormal development of the horns, which, instead of rising vertically from the forehead, curve from the root boldly forwards, then downwards, then backwards, like a pair of teapot-handles, each ending in a slightly incurved point close beneath the eye (text-fig. 28). There also appears at first sight to be no trace of the anterior tine or prong characteristic of the normal horn. Text-fig. 28. Lateral view o f head o f a castrated Prongbuck, showing the abnormal growth'and shape o f the horns. A writer in the 1 Field,' on February 4tli, commenting on the P r o c . Z o o l . S o c .--1905, V o l . I. No. X III. 13 |