52 Mamm. 
MAMMALIA. 
Chinchillidje. 
Lagostomus pallidens, n. sp., Amegiiino, (18) p. 48, from the Tertiaries 
of the Argentine. 
Tetrastylus , n. g., Amegiiino, (18) p. 44, for Megamys Icevigatus of the 
same author. T. diffissus , n. sp., Amegiiino (18), from the Tertiaries of 
the Argentine. 
Megamys prcependens and burmeisteri , n. spp., Amegiiino, (18) p. 37, 
from the Tertiaries of the Argentine. 
DasYPROCTIDjE. 
Ccelogenys paca. Goldi (133) and Ernst (109) on a pathological 
skull. 
Caviidjl 
Cavia porcellus. Lataste (192) on the origin of the domestic variety ; 
Cumberland (87), the domestic history of the Guinea Pig ; Laulani6 
(197) on the placenta of the Guinea Pig. 
Hydrochcerus robustus , n. sp., Leidy (206), fossil from Nicaragua, C.A. 
Plexochcerus , n. g., Amegiiino, (18) p. 56, for type llydrochcerus pcira- 
nensis of the same author. 
Anchimys , n. g., Amegiiino, (18) p. 69, for the type Cardiodon leidy ii 
of same author. 
Strata elevata, n. g. & sp., Amegiiino, (18) p. 68, from the Argentine 
Tertiaries. 
DUPLICIDENTATA. 
Lagomyidal 
Lagomys sp. : DepiSret (97), a species allied to L. meyeri , found in the 
Pliocene of Perpignan. L. rutilus : Schaff (327), a fresh description of 
this species from specimens in the Agricultural High School at Berlin. 
LepORIDAS. 
Lepus auriculus: Lataste (192) on the origin of the domestic breeds. 
L. timidus : Landois (185) on a Haro with abnormal teeth ; CrriAUUGi 
(67) on the structure of the ovary. L. timidus and cuniculus , dom. var., 
Nehring (265) on a cross between these two forms. 
INCERTJE SEDI3. * 
Morenia elephantina and complacita , n. spp., Amegiiino, (18) p. 49, 
from the Tertiaries of the Argentine. 
Orthomys proceclens and resecans , n. spp., Amegiiino, (18) pp. 53 & 54, 
from the Tertiaries of the Argentine. 
Epiblema horridula , n. g. & sp., Amegiiino, (18) p. 42, from the Ter- 
tiary of the Argentine. 
