THIS work is the outgrowth of Prof. Riley's fifteen years' experience in presenting the main facts of parasitology to students in the laboratory. The authors suggest that the first two practical periods should be devoted to a general survey of the parasites of the frog—Trypanosoma and Lankesterella (wrongly spelt throughout the book) in the blood, Helmmthes in the lungs, alimentary tract, and bladder, and Protozoa in the large intestine and kidney. Attention is then directed to the Trematoda, represented by Polystomum, Clonorchis, and Fasciola, and a key to the chief groups of cercariæ is added. The study of cestodes begins with that of Tœnia pisiformis, after which the human taenias and representative species of Hymenolepis, Dipylidium, Diphyllobothrium, multiceps, and Echinococcus are briefly considered. ascaris, the hookworms, Trichinella, and Trichuris are the Nematoda chosen for examination.
Guide to the Study of Animal Parasites.
Dr. William A. Riley Reed O. Christenson. (McGraw-Hill Publications in the Zoölogical Sciences.) Pp. xv + 131. (New York: McGraw Hill Book Co., Inc.; London: McGraw-Hill Publishing Co., Ltd., 1930.) 7s. 6d. net.