KITNGL. SV. VET. AKADEMIENS HANDLINQAR. BAND 48. N:0 5. 103 



The dimensions of my largest and next smallest specimens are as follows: 



Length of head and body 105 mm. 



» " tail 39 „ 



» » hind foot 20 » 



» » forearm and hand 27 5 » 



» » head about 33 » 



Distance from muzzle to ear 22.5 » 



» » » » eye 12,5 » 



>' » eye to ear 10,5 » 



Skull: 



Occiput to tip of nasal 23 » 



» » » » incisors 28,2 > 



Condylobasal length 26 » 



Condyle to incisor tip 27 8 » 



Greatest breadth 20,2 » 



Least width behind orbits 6 » 



Mastoid breadth 13 » 



Length of nasals 9,2 » 



Combined breadth of nasals in front 4,5 » 



Combined breadth of upper incisors 3,3 » 



Diastema 10 » 



Length of upper molar series 3,3 » 



Length of palate 13,6 » 



8(5 mm. 



19 



23,5 



23 



17,6 

 9,2 

 8,1 



18,4 



22,1 



20,6 



22 



15 

 5,7 



12 

 0,6 

 3,7 

 2,4 

 7,5 

 3,4 



11,7 



As these figures indicate there is a considerable difference in size between the 

 specimens collected. This stands of course in connection with difference in age, but 

 even the smaller and younger of these two specimens measured above has a plainly 

 developed lambdoid crest. Both have three molariform teeth on either side of both 

 jaws. As all my specimens are collected in the same locality there cannot, of course, 

 be any doubt about their representing the same species. But it is not quite so easy 

 to tell at once which. Fornarina is, of course, excluded in consequence of the number 

 of cheek teeth. Of the three species of Heterocephalus described, one, viz. H. ansorgei 

 Thomas,^ is very much smaller, if the type has been fuUgrown, and its cheek-teeth 

 are smaller. H. dunni Thomas^ which is a large species, is said to have a » short 

 low coronoid» on the lower jaw as Fornarina, and also the zygomata »very boldly 



expanded as much anteriorly as posteriorly » In my specimens the coronoid 



is high and slender, very different from the type exhibited by Fornarina. The shape 

 of the zygomatic arches is probably something intermediate between that exhibited 

 by H. glaber as represented by Ruppel's figure% and H. dunni as described by Thomas 

 (1. c). It is thus comparatively- more bowed out in its anterior portion than in the 

 former species, but the zygoma is conspicuously more expanded behind than in front. 



1 Proc. Zool. Soc, London 1903, p. 336. 



•' Ann. & Mag. Nat. Hist., Ser. 8, Vol. IV, 1909, p. 109. 



3 Mus Senckenb. Abhandl., Bd. Ill, Frankfurt 1845, Taf. X, Fig. 3 a, b, c. 



