1883. ] Proceedings of Scientific Societies. 1209 
casionally, but very seldom developed in the lower jaw, but is 
well exhibited in the skull of a zebra examined. This additional 
premolar is a direct link with the tertiary Hippotherium 
and Anchitherium. The development of the horse is probably 
linked with that of the steppes, deserts and prairies; Herr Otto 
Hermes denied a statement of Von Siebold, to the effect that “up 
to the present time no male eels had been found in fresh water.” 
Several male eels were found in the Lower Elbe, beyond the 
reach of sea-water; Herr Wittmack made some remarks upon 
the milky juice of Ficus carica; Professor Peters described the 
reptiles collected in Socotra by Dr. Riebeck. Among them are 
the new species Diplodactylus riebechit and Euprepes socotranus. 
the formule p. M. 4-4 
mM 3.4, Or 46 teeth in all, as in Otocyon. Also a skull of Cams 
dingo, with four premolars in front of the. sectorial teeth in the 
upper jaw. Herr Nehring stated that he had examined skulls of 
domestic dog which had five premolars in one or both sides 
of the maxillary, and an equal number in the under jaw also oc- 
curred, One dog-skull showed seven or eight upper incisors. In- 
stances of a less number than the ordinary also occur. This bos 
tion usually exhibits itself at either the front or hinder end oft : 
es of molars, that is, it is either the second tubercular or the 
