12 



PLEISTOCENE MAMMALIA, 



G. Li 11. .shiafa nnd 11. brvnvca llic fccoiid and third prciiiolors, Ijolli up])er and 

 lower, arc jjlared with the long axes oblique to the line of the alveolar border, while in 

 //, crocula this is not so. 



(5) Table of Measurements of the Permanent Teeth. 



Tor Bryan oaves, Torquay (Brit. 



Mus).,'fig. PI. IV. m^ 1 is from 



Wookey Hole. 



1. Antero-posterior extent at 

 base of crown 



2. Maximniu transverse 

 measvirenient 



3. Maxinmni length 



4. Measvirfments taken frcm 



notch between roots to top 

 of crown 



1-0 



1-35 



0-7 



1-4 



4-15 



6-3 



2-05 



2-25 

 1-2 



0-5 0-55 0-6 0' 



1-C5 1-7 2-2 I 2-25 



0-4 



0-55 



0-8 



1-35 



1-3 



1-55 



2-3 



2-55 



3-6 



G-2 



2-75 

 1-05 



4-5 

 2.5 



(6) Succession of Teeth in liyana. — This subject lias been dealt with by Boyd 

 Uawkins/ who mentions that in the uppei- jaw tlie fiist tooth to a])pear is pni. 1. In 

 the lower jaw, to judge by two specimens in the British Museum, c. and i. 1 appear 



first, followed by the large carnassial tooth m. 1, and by pni. 2; the other premolars, 

 pm. 3 and 4, appearing somewhat latei-. 



Boyd Uawkins mentions that the first teeth to disa])pear in the adult hyaena are the 

 large bone-crushers pm. 2 and 3, and pni. 3 and 4 ; these teeth are always very 

 much worn in the middle-aged adult, while pm, 1 and pm. 2 show scarcely any 

 trace of wear. 



(7) Distinctive Features of the Decid/fous Dentition of the Genus Ihjftna. — The 

 formuLi for the deciduous dentition in Hijcena is d.i. f d.c. \ d.m. |-, as in Canis and 

 JJrsus, as compared with d.i. f d.c. \ d.m. f in FeJis. 



I have not had an opportunity of examining the deciduous incisors, but de Biainville 

 notes that they differ from those of the adult in having the crown quite undivided. 

 There is no noteworthy difference in the canines. The most distinctive teeth are the 

 deciduous carnassials d.m. 3 and d.m. 4. 



D.m. 1. The only example of this tooth that I have seen is that shown in PI. V, fig. 5. 

 The fragment of the upper jaw showing deciduous dentition figured in PI. V, figs. 3, 4, 

 bears no trace of its alveolus. Dawkins- describes it as follows : — "Trenchant, conical, 

 and slightly incurved. Its anterior base, narrower than the posterior, bears a small cusp, 

 while the posterior generally exhibits a slight thickening without the cusp. Sometimes, 



' ' Nat. Hi.st. Rev.,' n. s., v. 



2 Iliia., V, 



