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 



