Mr. Owen on Mammalian Remains. 191 



XXI. — Description of the Mammalian Remains found at Kyson 

 in Suffolk, mentioned in the preceding Notice. By Richard 

 OweNj Esq.; F.R.S., &c. 



1. Molar of a Macacus. (Fig. 1.) 



This tooth was one of the first of the mammiferous remains 

 from the London clay formation at Kyson which was sub- 

 mitted to my examination by Mr. Lyell, and the one which 

 after a cursory comparison I observed to present a consider- 

 able resemblance with the molar of an opossum. I should not 

 however have presumed to have published a statement of its 

 affinity to, much less its identity with, the genus Didelphys, 

 without testing the fossil by a more extended and rigorous 

 comparison. 



This I have lately undertaken with a view to the present 

 communication, and the result has been to identify the tooth 

 as a second molar, left side, lower jaw of a Macacus (the tooth 

 which corresponds with the second f bicuspis' in. Human i\na- 

 tomy.) (See fig. 1.) The crown pre- Fig. i. 



sents four tubercles, arranged in two 

 transverse pairs, the anterior pair be- 

 ing the most distinctly developed, and a b 

 rising the highest (fig. a.) ; there is also a very small ridge or 

 rudimental talon at the anterior and another at the posterior 

 side of the crown ; the latter is placed between and connects 

 together the two posterior tubercles. The fangs are two, 

 strong and divergent; the anterior one has been broken oiF. 

 The grinding surface of the tooth presents two depressions, 

 a small one in front of the anterior pair of tubercles, and a 

 larger one between the two pairs of tubercles. (Fig. 1, b.) 

 The tooth has evidently belonged to an old individual, for the 

 tubercles are worn and the posterior concavity is smoothed 

 and deepened by attrition. It differs from the corresponding 

 tooth of a recent Macacus of the same size in having a slight 

 ridge along the base of the anterior part of the crown, and in 

 being a little narrower from side to side, and the same cha- 

 racters distinguish the posterior molar of the fossil Macacus 

 described by me in the September number of the f Magazine 

 of Natural History' (1839). As, moreover, the present fossil 



