10 Mamm. 
MAMMALIA. 
Kazzander, Gr. Sulla Radice Dorsale del Nervo Ipiglosso hell’ Uomo e 
nei Mammiferi Domestici. Anat. Anz. vi, pp. 440-450, fig. 
Keifel, F. [See p. 46, Suidce .] 
Kittl, E. Die Jungtertiaren Saugethierfunde in der Mannersdorfer 
Ziegelei bei Angern. Auu. Hofmuseum Wien, vi, Notizen, pp. 92-97, 
woodcut. 
Describes Pliocene Mammals from the banks of the river March, near 
Vienna. They include Dinotherium giganteum , Mastodon, a new Amphi- 
cyon , Hipparion gracile, and Rhinoceros. [See Candice.] 
Klaatsii, H. [See p. 58, Monotremata .] 
Klebs, E. Zur Vorgleichenden Anatomic der Placenta. Arch. mikr. 
Anat. xxxvii, pp. 835-356, pi. xvii, 
A detailed account of the minute structure of the placenta. 
Kukenthal, W. Einige Bemerkungen fiber die Saugethierbezahnuug. 
Anat. Anz. vi, pp. 364-370. 
* . Das Gtebiss von Didelphys. T. c. pp. 658-668, figs. 
Two very important papers, giving a preliminary account of the con- 
clusions to which the author’s observations have led him as to the homo- 
logy and serial sequence of the teeth of various groups of Mammals. It 
is concluded that the hypothesis that the milk-dentition is the superadded 
one is untenable, and that this is really the primitive or first dentition, to 
which the permanent or second dentition has been added. The author’s 
conclusions are derived from the following observations. Among the 
Odontoceti it is found that in the foetus there are traces of a replacing 
dentition which never come to maturity, and it is accordingly urged that 
the functional teeth of this group belong to the milk-series. Among the 
Mystacoceti (which are regarded as having a phylogeny totally distinct 
from that of the Odontoceti ), it is shown that in the foetal teeth-germs 
the hinder ones are originally complex, and subsequently split up into 
simple teeth like those in the anterior part of the jaw ; and it is there- 
fore argued that the Cetacean deutition was originally heterodont. 
Traces of a deciduous set of teeth indicate that the aborted teeth of the 
Mystacocetes belong to the permanent series. The presence of milk- 
teeth in a species of Dasypus is held to prove that the Edentate dentition 
was originally diphyodout. More important than all, is the discovery of 
a series of rudimental successional teeth in embryoes of Didelphys , which, 
taken in conjunction with the circumstance that all the teeth of Marsu- 
pials in advance of the true molars (with the exception of the replacing 
premolar), are developed from the superficial layer of tissue, is taken to 
prove that the whole of the Marsupial dentition (exclusive of the tooth 
referred to) belongs to the milk-series. It is further argued that the 
replacing tooth of the Marsupials is the third, and not the fourth pre- 
molar, as has been of late held to be the case. 
Langkavel, B. [See p. 32, Octodontuhv. , and p. 42, Bovidce.] 
