243-253 References should be cited in the text by numbers in square brackets referring to a numbered list. Illustrations must be restricted to the minimum needed to clarify the text. Previously published illustrations are usually not accepted. Data given in graphs or tables should not be repeated in the next. All figures, whether photographs, graphs, or diagrams, must be mentioned in the text, and the top of the figure, the title of the paper, the author's name, and the figure number should be marked lightly on the reverse side in soft pencil.
All figures are to be numbered consecutively throughout and submitted separately.
Whenever possible, several figures should be grouped into a plate. Illustrations prepared in digital form must be in accordance with the technical instructions for manuscripts and illustrations in electronic form that are published in this journal. 9.1 Line drawings. High quality prints or good originals should be submitted. The inscriptions should be clearly legible.