On small }[ammah from North-weslern Patagonia. 109 



belonged to a very diffeient group — the OpiatliomI (c/. 

 llo^aii *) — and Itliitik tliut C/iaud/iurid may ho churiicteiizLMl 

 siiiiply !13 a Masfucenilntiis Witlunit sjjino.s and witliout rostral 

 a|)|HMidii|re. In other characlers — lornj, stalin;,', sfrucfnie 

 and po>i(ion of Hns, nodlrils, niuuth, lips, dcntuion, gill- 

 openinirs, branchiostogal rays, etc. — there seems to be no 

 ditferenee between the two genera. The few dotuils j^iven of 

 (he sktdeton ui. the head of Chaudkuria are a|)plieahle to 

 Mii>tactfml>e/ns, idlowaiice b(iii£r uiade tor the prtenaxillary, 

 with the attached maxillary, being described \>y L)r. Annandale 

 a.s the inaxilhuy only. Tiie peeuliariiie.s of the veitebrse, to 

 which Dr. Annandale has called attention, are found in 

 Alastacembelus also. 



Dr. Annandale informs me tliat he has no time at present 

 to make a furiher investigation in order to test the validity 

 of my opinion as to the systematic position ot Chnndliiiria, 

 and, as no speciniens are availahle for examination in this 

 country, it seems worth while to publish this note. 



XVI. — On small Mammals coUected hif Sr. E. Budin in 

 jyoilh-weit' rn Patagonia. By Oldfielu Thomas. 



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



SliSOR E. HUDIN, the collector of the Chumbicha mammals 

 described in the last number of the ' Annals 'f? helped by 

 the kindness of Dr. O'Connor, Mr. Charles Lockwood, and 

 the authorities of the Argentine Southern Laud Company 

 of Buenos Ayre?, has also been enabled to make a collecting- 

 trip to Lake Nahuel Huaj)i, in the mountainous part of 

 North-western Patagonia, and to two other places in the 

 same region, Pilc.ineu on the Upper Rio Negro (41° S., 

 71° W.j and Maiten on the U[.per Chubut (-42^ 8., 71^ W.). 



At taih of these jdaces la- n)ade a collection of small 

 mammals, mostly Muridse and tuco-tucos, and all prove to bo 

 of the greatest interest. 



Of the twenty forms obtained 1 have found it necessary to 

 describe nine as new, while he has also collected an animal — 

 the Reitlirodun lon'/icaudatus of Philippi — which proves to 

 represent a very distinct new genus, quite unlike anything 

 previously known to me. 



• Re<j[an, "The Osteology of tho Teleostean Fishes of the Order 

 Opisthomi," Ann, & Mag. Nat. Hist. (8) ix. 1U12, pp. l.'17-l^iy. 

 t Sui>ra, p. 11 o. 



