IN LIBERIA. 31 



If the epidermis is lost (and this is very difficult to pre- 

 veut) then the color is » rosea", and therefore there is 

 reason to believe that the specimen in the Paris Museum 

 had lost its epidermis. Biittikofer showed to the natives a 

 colored copy of Milne Edwards' plate (1. c. plate I) but they 

 unanimously assured that they never had seen a Hippopota- 

 mus of that color and that this animal never had a rose-color. 



Iris black. 



Skeleton with 7 cervicales , 15 costales, 4 lumbares and 

 17 caudales. 



There is a peculiar inconstancy in the number of loiuer 

 incisors in the three skulls now before me, viz: that of 

 an adult male , of a nearly fullgrown female (the hind- 

 most upper- and lower molars are present, but have not 

 yet obtained their full development) and of a halfgrown 

 male (greatest length of skull 210 mM.). In the smallest 

 skull there are two alveoli and in each alveolus three teeth 

 (in the left ramus the smallest tooth is fallen out). In 

 the lower jaw of the female-skull there are in the right 

 ramus two alveoli closely crowded and in each alveolus a 

 single tooth (the tooth near the canine is the smallest 

 and measures about 10 mM., the other measures about 

 26 mM.) , meanwhile there is in the left ramus a single 

 alveolus with one tooth as large and strong as the lar- 

 gest tooth in the right ramus. The right ramus of the 

 lower jaw of the adult male presents a single alveolus 

 with a single incisor (measuring 42 mM.); the left ramus 

 a single alveolus however with three well developed in- 

 cisors (the largest measures 48 mM., the second 30 mM. 

 and the third one 9 mM.). I studied our skulls of H. am- 

 phibius in order to investigate if there the number of lower 

 incisors always is constant and I find in the six skulls in 

 our Museum normally two incisors in each ramus of the 

 lower jaw, but N°. c (see Cat. osteol. 1887) has only one 

 incisor in each ramus and no trace of a second , mean- 

 while N . b {a somewhat younger specimen, as the hind- 

 most molars are not yet developed) shows in each ramus 



Notes from the Leyden JMuseum, "Vol. X. 



