RODENTIA. 
Mamm . 39 
lagurus. It differs from Myodes in having 5 or 6 prisms in the third 
upper, 7 or 9 in the first lower, and 5 in the third lower molars, instead of 
4 or 5, 5, and 4, respectively. 
Siphneus arvicolinus, sp. n. (foss.), A. Nehring, SB. nat. Fr. 1883, p. 19 
(woodcuts), from lacustrine deposits on the Upper Hoangho. 
GEOMYIDiE. 
A Cricetodipus parvus , Baird, is a good species ; F. W. True, P. U. S. 
Nat. Mus. iv. p. 474. Measurements of 6 specimens are given. [Omitted 
from Zool. Rec. xviii. Mamm. 1881.] 
Dipodid^. 
Lataste, F. Les Gerboises d’Alg^rie. Ann. Mus. Genov, xviii. 
pp. 661-683. 
An excellent account of the 3 species of J erboa found in Algeria, with 
synonymies, descriptions, and notes on their habits in captivity ; 1 species 
is new. 
Dipus cegyptius. Notes on its habits in confinement; F. Lataste, Le 
I}at. ii. 1883, pp. 236, 243, 252 & 260. 
-I Dipus darricarrerii , sp. n., id. Ann. Mus. Genov, xviii. p. 661, 
Algeria. 
Dipodillus simoni. On its acclimatization and domestication ; id. 
Bull. Soc. Acclim. (3) x. p. 369. Contains also important notes upon the 
occurrence of rickets and other diseases in captive rodents. 
Zapodid^e. 
Zapus hudsonius. On its hibernation ; C. J. Maynard, J. Bost. Soc. 
1883. [Not seen by Recorder; cf. Am. Nat. xvii. p. 334.] 
OCTODONTID2E. 
^ Ctenomys latidens and Myopotamus prisons , spp. nn. (foss.), Gervais & 
Ameghino, op. cit. (gen. subj.) pp. 67 & 69, S. America. 
CHINCHILLIDyE. 
^ Lagostomus antiquus, sp. n. (foss.). F. Ameghino, Bol. Ac. Arg. v. 
p. 103, Entre Rios. 
4 Lagostomus fossilis , sp. n. (foss.), Gervais & Ameghino, op. cit. (gen. 
subj.) p. 63, S. America. 
Cayiid^. 
'f Cerodon major and minor , spp. nn. (foss.) ; Microcavia lypus , robusta, 
intermedia , and dubia , g. & spp. nn. (foss.) : Gervais & Ameghino, op. cit. 
(gen. subj.) pp. 47-55, S. America. 
