THE GENERAL SUBJECT. 
Mamm . 3 
Allen, H. On the Influence Exerted by the Tongue on the Positions 
of the Teeth. P. Ac. Philad. 1891, p. 451. 
It is considered that in cases where the tongue is used for prehension 
there has been a tendency to induce the lower incisors to become procli- 
vous. 
. [See also p. 23, VespertilionidceJ] 
Ameghino, F. Una rzipida ojeada (\ la Evolucion Filogendtica de los 
Mamiferos. Rev. A rg. Hist. Nat. i, pp. 17-28. 
A reviow of the pliylogonetical evolution of the extinct Mammals of 
Argentina. 
. Sobre algunos restos de Mamiferos Fosiles, recogidos por el Sefior 
Manuel B. Zavaleta en la Formacion Miocena de Tucuman y Cata- 
marca. T. c. pp. 88-101, figures. 
Describes and figures Mammalians obtained at Tucuman and Cata- 
marca (N.-W. Argentina), from deposits which are regarded as of Miocone 
age. These comprise Megamys formosus, Tetrastylus montcinus (u. sp.), 
Typolherium (?) internum (n. sp.), a new genus of Megatheriidcc , and 
Plohophorus ameghinii. [See Chinchillidce, Ty pother iidee, and Mega- 
theriidcc. 
. Las Antiquas Conexiones del Contineute Sud-Americano y la 
Fauna Eocena Argentina. T. c. pp. 123-125. 
The author insists on the impossibility of Chalicotherium being in any 
way intermediate between Ungulates and Edentates. 
. Caracteres diagnostics de Cincuenta, Especies Nuevas de Mami- 
feros Fdsiles Argentinas. T. c. pp. 129-169, illustrated. 
Comprises descriptions of a large number of new genera and species. 
Macrauchenia and its allies are taken to represent a distinct suborder of 
Ungnlata — the Litopterna. Several interesting Creodonts are described 
and figured ; as well as a large number of Edentates, and some Cetaceans. 
Especial interest attaches to the figure of the skull of the Toxodont genus 
Acrotherium , as showing the presence of 8 cheek-teeth, 5 of wdiich appear 
to be premolars. [See Creodonta , Sciuridce, Octodontidce , Chinchillidce , 
JEocardiidce , Caviidce. Tillodontia , Toxodontia , Macraucheniidcc , Protero- 
theriidee , Camelidce , Balceniclce , Platanistidce, Megatheriidcc, and Dacy- 
podidce.\ 
. Mamiferos y Aves Fosiles Argentinas. Especies nuevas, adiciones 
y correcciones. T. c. pp. 240-259. 
Notices 68 species of Mammals, some of which are new ; while several 
new generic names are proposed for preoccupied ones. Among these are 
new names for Auchenia, Blastoceros, Schizodon , and Xenurus ; while it 
is urged that Cheloniechus should be substituted for Priodon. It is shown 
that the presumed Edentate genus Phororhacos (= Phorusrhackos, Zoo 1. 
Rec. xxiv, Mamm . p. 52) is really avian. [See Octodontidce , Chinchillidce, 
