1881.] MR. O. THOMAS ON MURID.B FROM CENTRAL PERU. 447 



yellow, covered with small spots and a few blotches along the lateral 

 line. Dorsal fin with ohlique transverse bars. Ca\idal colourless, 

 with the ends of the rays yellow, and a few indistinct transverse 

 bands. 



Geographical Distribution. Up to the present time this species has 

 been recorded from the coasts of Greenland and Iceland. It is 

 common off Spitzbergen and on the shores of North-western Europe 

 as far south as the Cattegat. In the North its range extends cer- 

 tainly as high as 80°. Collett observes that along the coast of 

 Norway it appears to be rather a common fish in most localities. 



Irrespective of the interesting fact of this fish being new to the 

 British fish-fauna, it is likewise remarkable for the two elongated 

 caudal rays, which give to this male specimen a different appearance 

 from that of previous figures and descriptions. This fish will form an 

 addition to the Zoological Museum of the University of St. Andrews, 

 which Professor Mcintosh is taking so much pains to enlarge and 

 improve. 



10. Ou a Collection of Muridce from Ceutral Peru. 

 By Oldfield Thomas, F.Z.S., Natural History Museum. 



[Eeceived June 17, 1884.] 

 (Plates XLII.-XLIV.) 



During the years from 1870 to 1873 the well-known Polish traveller 

 M. Constantin Jelski obtained the present fine collection of Muridse 

 for the Warsaw Museum, and it is to the Director of that Museum, 

 Prof. L. Taczanowski, that I owe the opportunity of working out 

 this most interesting series of Siguiodont Rats and Mice. 



The specimens were all collected in that part of Central Peru 

 which is contained in a triangle of whicli Lima, Juniu, and Huanta 

 form the three apices, the greater part of them coming from Junin 

 itself. 



Prof. Taczanowski has furnished me with the following notes on 

 the stations at which the Muridse were collected : — 



"Junin. — Region of the 'puna,' or mountain grass-land, close to 

 the lake of the same name, called also Lake Chinchacocha, one day 

 distant from Tarraa, the capital of the Department Junin. The lake 

 is situated in the centre of a marshy prairie abounding in small 

 lakes and streams, and covered in many places with thick patches of 

 rushes. 



"Amahle Maria. — Farm situated between the streams of Chancha- 

 niayo and Anamayo, at a little distance from the river Tutumayo, at 

 an altitude of about 2000 feet above the sea. 



" Mar ay nice. — A farm close to the source of the Aynamayo, near 

 the valley of Chauchamayo." 



The present paper is practically a continuation of that read before 

 this Society in 1882, when the collection obtained by M. Stolzmann 

 in the extreme north of Peru waa described, this still larger series 



30* 



