M. 1669. 
HYANODONTIDA. DAS 
cimen agrees exactly with the corresponding portion of 
the last specimen. Purchased, 1884. 
Fragment of the right ramus of the mandible, containing 
the three true molars, the last two premolars, and the 
alveolus of the canine ; from the Upper Hocene of Caylux. 
This specimen appears to agree very closely with the 
mandible figured by P. Gervais in the ‘Zoologie et 
Paléontologie Frangaises,’ 2nd ed. pl. xxiv. fig. 11. The 
space occupied by the last five cheek-teeth is 0,057, and 
the interval between the alveolus of the canine and the 
hinder border of ™.3 is 0,070. Purchased, 1884. 
Elyzenodon minor, P. Gervais’. 
This species is larger than Hyanodon brachyrhynchus, from 
which it 
is distinguished by its relatively longer mandible, larger 
canine, and smaller last lower true molar. The type specimen was 
obtained from the Upper Hocene near Alais (Gard), France. 
fiab, Kurope. 
29752. The mandible of a very aged individual; from the Headon 
beds (Upper Eocene) of Hordwell, Hampshire. The teeth 
are very much worn, the crowns of most of the true molars 
having completely disappeared ; the incisors and the first 
premolar are wanting, and the crown of the left canine is 
broken off. The specimen seems to agree precisely with 
the type mandible figured by P. Gervais in the Zool. et Pal. 
Frangaises, 2nd ed. pl. xxv. fig. 9. It differs from the 
mandible of H. brachyrhynchus by its more elongated 
form, and is considerably larger than that of H. compressus, 
Filhol*, although somewhat similar in form. It is on the 
evidence of this specimen (which has been already noticed 
by the present writer in the Geol. Mag. dec. 3, vol. i. 
p. 444) that the occurrence of Hycnodon in the Hamp- 
shire basin’ is recorded in the Quart. Journ. Geol. Soc. 
vol. xxxix. p. 571. The interval between the canine and 
the hinder border of m. 3 is 0,076. 
Hastings Collection. Purchased, 1855, 
1 Zool. et Pal. Frangaises, Ist ed. vol. i. p. 129 (1848-52). 
2 Ann. Sci. Géol. vol. vii. pl. xxxiii. figs. 161-163. 
3 The exact position of the bed from which this fossil was obtained is given 
in the memoir cited. In the Quart. Journ. Geol. Soc. vol. xxxvi. p. 383, Boyd 
Dawkins mentions the occurrence of Hyenodon leptorhynchus in the Headon 
beds. This statement probably rests on a misidentification of the present 
specimen. 
