On new Asiatic Murid?e. 



205 



abdomen seems to be very distensible and the vent is situated 

 just in front of the anal fin. The myotomes number about 

 62. The caudal fin has 19 principal rays and there are 18 

 rays in the dorsal fin, 12 in the anal, 16 in the pectoral, and 

 8 in the pelvic ; all the rays of the dorsal, anal, and pelvic 

 fins appear to be very elongate and unbranched, but some of 

 them may have been branched distally; the pelvic fins are 

 rather widely separated and are inserted just behind the 

 pectorals. The gill-membranes are free from the isthmus 

 and the branchiostegals are rather long, slender, and curved. 



Macristtum chavesi (slightly reduced), a, head from above. 



about 8 in number on each side ; there are 4 gills and no 

 pseudobranchise. Small acutely pointed teeth are presetit in 

 the lower jaw and on the vomer, palatines, and tongue ; the 

 maxillary is broad, rounded posteriorly, without supra- 

 maxillary. There are two nostrils on each side which are 

 superior rather than lateral in position and lie near the end 

 of the snout in front of the anterior end of what appears to 

 be an elongate supraorbital bone; the head is flattish above 

 and the frontals are slightly raised above each eye. The 

 post-temporals approach each other rather closely in the 

 occipital region. 



XX. — Xeio Asiatic Murid^e. By Oldfield Thomas. 



(Published by permission of the Trustees of the British Museum.) 



Epimys nhiteheadi perlutus, subsp. n. 

 Essential characters of true lohiteheadi, but with larger 



skull and greyish belly. 



