A NEW MURINE GENUS AND SPECIES FROM SIND. 997 



general type as in Acomys, not hypsodont as in the more typical 

 Epimys, and m 1 not disproportionally large as in Mus and Leggada. 

 But their pattern is more zigzagged, so as to look more compli- 

 cated, though the size, number and position of the cusps is the 

 same. Antero-internal cusp of m 2 very large, antero-external 

 very small. M 3 well developed, with three distinct cusps on its 

 inner edge. 



Type. — Pyromys priestleyi, sp. n. 



The most striking point about this genus is its unique mammary 

 formula, no other known Murine having four pectoral pairs. 



PYROMYS PRIESTLEYI, sp. n. 



General external appearance almost exactly as in Leggada platy- 

 thrix sadhu, brought from the same locality. Fur thickly mixed 

 with spines, those of back about 6 mm. in length. General 

 colour above, uniform pale grey (" drab-grey ") without any buffy 

 suffusion. Under surface white, the hairs and spines white to their 

 roots ; line of demarcation well defined. Face like back. Ears 

 short, greyish-brown. Fore limbs, from elbows downwards, and 

 hands white. Hind limbs greyish externally to ankles ; feet white. 

 Soles naked, pads large and rounded ; fifth hind toe, without claw, 

 reaching to middle or end of the first phalanx of the fourth. Tail 

 shorter than head and body, well haired; pale greyish above, 

 white below, not shapely defined; scales small, about 16-18 to the 

 centimeter. 



Skull and teeth as described above. 



Dimensions of the type, measured in the flesh : — Head and body 

 98 ; tail 73 ; hindfoot 16 ; ear 13. 



Shdl. — Greatest length 26*2; basilar length 21; zygomatic 

 breadth 12-3; nasals 10; interorbital breadth 3-5; breadth 

 of brain case 11; palatilar length 12-5 ; diastema 7*6 ; anterior 

 palatal foramina 6; posterior palatal foramina 1-9 ; length of 

 upper molar series 4-3. 



Habitat. — Virawah, Thar and Parkar, Southern Sind. 



Type.— Adult female. B. M. No. 11, 3, 13, 9. Collected 

 25th September 1910, and presented by Mr. E. Priestley, D. S. P., 

 through the Bombay Natural History Society. 

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