108 ON DACTYLOMYS DACTYLINUS 



denen sie sich zunachst an Chaetomys anschliesseu wiirde." 

 For the rest Hensel said not a single word concerning 

 the remarkable dentition of D. amhlyonyx nor in this nor 

 in his other papers on the subject. 



In 1888 Prof, H. Winge wrote a paper on » Jordfundne 

 og nulevende Gnavere fra Lagoa Santa, Miuas Geraes, 

 Brasilien." He had two specimens of D. amhlyonyx from 

 Rio de Janeiro and Porto Alegre; skull and dentition 

 (partly) figured on plate VII , head and feet on plate VI. 

 As I cannot understand Winge's language I am not able 

 to tell what he stated about the species in question. 



Dr. E. A. Göldi from Rio de Janeiro relates ^) that he 

 personally collected specimens of D. amhlyonyx and con- 

 firms the biological observations made by Dr. Hensel. 

 Nothing about dentition. 



The dentition of D. typus {dactylinus) has been very in- 

 sufficiently described and figured — I remarked it already 

 in 1887 — meanwhile the dentition of amhlyonyx has 

 not sufficiently been studied and described — as I just poin- 

 ted out — and therefore I think that a very accurate and 

 minutely made description of both dentitions may be called 

 a desideratum ; the conclusion we arrive at will be unexpected 

 and surprising. 



dactylinus ^) : the series of molar teeth of opposite sides 

 of the upper jaw very converging and nearly meeting 

 in front, of the lower jaw also converging but in 

 front not surpassing half the distance of the hindmost 

 molars. In both jaws all the enamel folds are directed 

 backward under an angle of about 45°. Each molar 

 divided into two separate lobes; those of the 

 upper jaw in the form of a tuning-fork; in those of the 

 lower jaw (except in the premolars) the foremost lobe pre- 

 sents more the form of a V, meanwhile the other lobe 



1) Der Zoologische Garten, 1889, p. 225. Die Bambasratte oder brasiliani- 

 sche Fingerratte, Bactylomys amhlyonyx Natt. 



2) Skull of the specimen discussed in the Notes from the Leyden Museum, 1887. 



Notes from the Leyden JMuseiim, Vol. XIII. 



