6 ARKIV FÖR ZOOLOGI. BAND 7. N:0 17. 



DOW in the Cambridge Natural History 1901 doubts sucli a break 

 even in the Nototrema pygmceiim where, however, there is a 

 long fissure along the back. Without any examination of a 

 female of this form, preferably both with, and without eggs 

 in the pouch, it is of course rather difficult to express an 

 opinion on this matter and to iinderstand the relation be- 

 tween this and the other species, but to judge by the figures 

 of Brändes and Schoenichen the pouch in N. pygmoeum 

 seems to be identical with what Weinland names »Beuteh, 

 which he distinguishes from the inner pouch, »die BHnd- 

 säcke». The whole pouch by N. "pygmoeum should then be 

 only what I here have named vestihulum. Also Weinland 

 says that the two folds which börder the »Beuteb> may 

 adhere together. By this way of explaining the pouch of 

 N. pygmceum its origin and metamorphsis, as it is described 

 by Brändes and Schoenichen, should be rather well in cor- 

 respondence with the state of things in the other species, in 

 which,. as I have tried to show with the help of this speci- 

 men, the outer part of the pouch, the vestibulum, originates 

 from two low lateral dermal folds, which grow towards each 

 other, and disappear again, when the young-ones leave the 

 pouch. The oval, by low dermal ridges bordered area which 

 in this and probably also in other species exist on the poste- 

 rior part of the back, when the pouch is empty^, should then, 

 if my opinion is right, reach över the entire back in Noto- 

 trema pygmceum. The outer cavity (»vestibulum») which ori- 

 ginates from it would then be sufficient for secreting the 

 eggs, and there should not be any reason for an invagination 

 of the skin to an inner large pouch, as in other forms, where 

 the vestibulum is small. 



This new species as well as Leptodactyfus bvfo are 

 kindly revised by Dr. G. A. Boulenger, wherefore I beg 

 to express to him my sincere gratitude. 



^ See BouLENGER^s figure of N. longipes in Cat. Batr. Sal. Pl. 27. 



Tryckt den 7 juli 191L 



Uppsala 19n. Almqvist & Wiksells Boktrj-ckeri-A.-B. 



