4 ARKIV FÖR ZOOLOGI. BAND 7. N:0 17. 



The colour in spirit: Upper parts of head and body ochra- 

 ceous brown with dark shades, under parts uniform reddish 

 brown; iegs påle yellow with broad distinct brown cross- 

 bands, bordered with black. 



Measurements : Length from nose to vent 68 mm; length 

 of nose 11 mm; diameter of orbit 7,5 mm; diameter of tym- 

 panum 3,5 mm; greatest breadth of head 24 mm; smallest 

 breadth of interorbital space 10,5 mm; length of femur 33 

 mm; length of tibia 35 mm; length of tarsus with 4:th toe 

 48 mm. 



The specimen is captured near Santos, Prov. San Paulo, 

 Brazil, by Mr Hjalmar Mosin 1874, and belongs to the col- 

 lections of the R. Museum of Natural History in Stockholm. 



It is a female with small eggs in the ovary. Of the 

 dorsal pouch, typical for the Nototrejna-iemales, there is ex- 

 ternally only a distinct dermal fold, bordering a longitudinal 

 oval area on the posterior third part of the back. No ope- 

 ning to any cavity under the dorsal skin is to be seen, and 

 if we did not know that a dorsal pouch is typical for the 

 genus Nototrema, we would not be able to suspect any such, 

 though the very loose, vide, and at the sides plicated skin 

 speaks for a state of things that corresponds with other spe- 

 cies. Cutting up the dorsal skin I also found a large wide 

 pouch, reaching as far as to the head, though now quite 

 empty. As usual it is enclosed by the dorsal skin and a 

 thin membrane, distinctly separated from the underlying dor- 

 sal muscles and serving as floor in the pouch. Along the 

 above mentioned fold the membrane is connected with the 

 skin, the cavity thus being a completely closed up room 

 (figure le). In the bottom of the fold, where the skin even 

 now is very thin, at the breeding season the thickened edge 

 of the dorsal skin evidently loosens, the pouch getting an 

 opening outwards (fig. 1 d); probably at the same time the 

 lateral folds, bordering the area spöken of above, grow to- 

 wards each other, forming a kind of vestibulum to the large 

 inner pouch with a fissure-like outer opening between the 

 edges. Afterwards when the young ones ha ve left the pouch, 

 the folds sink in again towards the sides, the vestibulum 

 disappears, and the opening to the inner pouch closes up, 

 the free börder growing together with the skin which lies 

 behind. In other ways I at least cannot understand the 



