22 



KJCUD ANDERSES 



(104) 



This constriction of the sella — however insignificant it may 

 seem to he for a hasty inspection — is of no small interest from 

 a phylogenetic point of view. We rind a similar constriction in the 

 most primitive members of the Rh. simplex group; hut hoth in 

 the simplex and the lepidus groups it gradually disappears in the 

 more advanced species, or, in a still later stage, is transformed 

 into a pandurate emargination of the lateral margins of the sella. 

 This — in connection with the tarts that in primitive species of 

 both groups the dentition is practically identical , the cranial diffe- 

 rences exceedingly trivial, and the wing-structure quite the same 

 — seems to lend support to the opinion I have expressed else- 

 where ( 1 ), that the ancestors of the simplex and lepidus groups 

 must have been extremely closely related; their common origin 

 does not lie far down in the genealogical tree of the genus. 



Measurements of Rh. einpusa, andreinii, and blasii. 





Rh. einpusa. 



Rli andreinii'. 



Rh. blasii. 





Q ad. 



cf ad. 



8 adults, 





Type. 



4 skulls. 









Min. 



Max. 





mm. 



mm. 



mm. 



mm. 



Ears, length 



15.2 



16.8 



17.7 



18.2 



» greatest breadth 



13.2 



13.5 



13.9 



14.6 



llorse-slioc, breadth 



9 



8 



6.8 



7.9 



Forearm 



48 



46.5 



45.5 



48.6 





30.8 



30.2 



28.8 



31.2 



» 1st phalanx 



15.7 



15 



14.3 



16.2 





24 



26 



23 



24 





33.7 



33.7 



31.8 



34.3 



» 1st phalanx 



1) 



8.7 



8.1 



9 





15 



15 



14 



15.3 



5th digit, metacarpal 



35 



34.2 



32.6 



35 





11 



11 



10.8 



11.8 



» 2nd phalanx 



12 



13.2 



11.2 



12.5 



Tail . » . . 



25.3 



22.8 



23.2 



26.7 





20.2 



19.2 



20 



21.5 



Foot, -with claws 



9.8 



9 



9.6 



10.8 



skull, total length to front of c . 



19.8 



19.3 



19.8 



19.9 



» basilar length to front of c. 



15.2 



14.9 



15.6 



15.8 





9.3 



8.9 



9.2 



9.2 



» width of brain-case .... 



8.1 



7.8 



s 





» zygomatic width 



<) 



8.9 



8.8 



9 





0.1 



6.2 



6.3 



6.7 



» across singula of c . . . . 



4.2 



4.3 



4.7 



4.8 



» width of nasal swellings . . 



5 



5 



5 



5.1 





12.1 



12.2 



12.1 



12.5 





6.5 



6.7 



6.7 



7 



Lower teeth 



6.8 



7.2 



7.2 



7.3 



(') Proc. Zool. Soc. London 1905, II. p. 135. 



