53 the most apparent difference being that the coecum bears eight pairs of diverticula while there are six in N. pelagica. The nervous and circulatory systems resemble very closely the California species and demand no especial description. Concerning the reproductive system there are some features that appear to be of specific value. Heath and Cravens have shown that the so-called cephalic glands are in reality reproductive organs, and in every specimen examined by them they proved to be testes. The same is true in the present instance. Every one of the six specimens are males, and we are left to imagine the habits and the habitat of the fe-males which appear to be considerably different from those of the male. Each testis is a sac with a short neck communicating with the exterior. The developing sex products have the same origin as in N. pt lagica and are seemingly as abundant, but in every individual the outline of every one of the glands presents an irregular, shrunken appearance and highly different from the globular type occurring in other species. Xectone inertes japonica is more closely related to N. pelagica than to any other species of the genus now known, but comparing carefully examples of each several minor differences appear. "Whether these are of specific value cannot be decided without a larger series of specimens, but for the present the shape of the gonads, their smaller number and the number of diverticula on the intestinal coecum are sufficiently con-stant and well marked to separate the species. 3. Parasitische Copepoden auf Coregonen. Ein Beitrag zur Kenntnis der parasitischen Copepoden der Schweiz. Von Dr. F. Bau mann, Bern. (Mit 2 Figuren. eingeg. 7. Mai 1912. Die vorliegende Mitteilung bezieht sich auf parasitische Copepoden, die in den Kiemen und auf der Haut von Coregonen aus Schweizer Seen beobachtet worden sind. Es handelt sich um drei Arten, von denen zwei neu und die dritte auch erst im Jahre 1908 durch Neresheimer näher bekannt wurde. 1. Ergasilus surbecki n. sp. Die Exemplare dieser Art stammen z. T. aus dem Zugersee, z. T. aus dem Neuenburgersee und wurden mir von den Herren Dr. Gr. Sur-beck, eidgenössischer Fischereiinspektor in Bern, und Prof. Dr. O.Fuhr-mann in Neuenburg zur Bearbeitung überlassen. Die Tiere traten nur im Zugersee epidemisch auf, wo sie in den Kiemen der Wirtstiere
BioStor
