Published in Proceedings of The Biological Society of Washington, in 1893, in volume 8, pages 1-8

Published in Proceedings of The Biological Society of Washington, in 1893, in volume 8, pages 9-40

Published in Proceedings of The Biological Society of Washington, in 1893, in volume 8, pages 41-53

Published in Proceedings of The Biological Society of Washington, in 1893, in volume 8, pages 55-69

Published in Proceedings of The Biological Society of Washington, in 1893, in volume 8, pages 71-78

Published in Proceedings of The Biological Society of Washington, in 1893, in volume 8, pages 79-82

Published in Proceedings of The Biological Society of Washington, in 1893, in volume 8, pages 97-108

Published in Proceedings of The Biological Society of Washington, in 1893, in volume 8, pages 109-112

Published in Proceedings of The Biological Society of Washington, in 1893, in volume 8, pages 113-116

Published in Proceedings of The Biological Society of Washington, in 1893, in volume 8, pages 117-120

Published in Proceedings of The Biological Society of Washington, in 1893, in volume 8, pages 121-128

Published in Proceedings of The Biological Society of Washington, in 1893, in volume 8, pages 129-138

Published in Proceedings of The Biological Society of Washington, in 1893, in volume 8, pages 139-141

Published in Proceedings of The Biological Society of Washington, in 1893, in volume 8, pages 143-146