RODENTIA. 
Mamm, 29 
Mas musculus. On its early development ; see supra, Selenka 
(p. 27). 
Mus sylvaticus. On its breeding habits ; R. M. Barrington, Zool. (3) 
vi. p. 121. The period of gestation is about three weeks. 
Mus edwardsi, sp. n., 0. Thomas, P. Z. S. 1882, p. 387, pi. xliv., 
Western Fo-kien, China. 
Mus nigricauda , sp. n., id. 1. c. p. 266, pi. xiv., Damara-land. 
Mus tompsoni , sp. n., E. P. Ramsay, P. Linn. Soc. N. S. W. vi. p. 763, 
Now South Wales. 
Mus salatnonis, sp. n., id. op. cit. vii. p. 43, Ugi, Solomon Islands. 
Mas velutinus, sp. n., O. Thomas, Ann. N. H. (5) ix. p. 415, Tasmania. 
Mastacomys , g. n., id. 1. c. p. 413. Like Mus , but with greatly 
broadened molars and fewer mamm®. M. fuscus, sp. n., id. ibid., Tas- 
mania. 
Hesperomys spinosus , cinereus (pi. iv.), and taczanowskii , spp. nn., 
0. Thomas, P. Z. S. 1882, pp. 105, 108 & 109, N. Peru. 
Arvicola. On the French species of this genus ; E. L. Trouessart, 
Feuill. Nat. xiii. [A separate copy only seen.] 
Arvicola terrestris. Note on the habits of this species or variety ; E. L. 
Trouessart, Le Nat. iv. p. 24. 
Arvicola intermedius, sp. n. (foss.), E. T. Newton, Geol. Mag. (2) viii. 
[1881] p. 258, Forest-beds of the east of England. 
^ Arvicola arvalis. On its foetal development; C. Kupffer, SB. bayer. 
Ak. xii. p. 621. 
'd Arvicola subterraneus and savii. Notes on Venetian specimens ; A. P. 
Ninni, Atti 1st. Venet. (5) viii. p. 571. 
Dipodidjj. • 
A popular account of this family is given by F. Lataste, La Nature, x. 
(1) p.246. 
^ Dobson, G. E. On the Natural position of the Family Dipodidcc. 
P. Z. S. 1882, p. 640. 
The author would place this family among the Hystricomorpha , mainly 
on account of the united condition of the tendons of the flexores digi- 
torum tibialis and fibu laris. 
HYSTRICIDiE. 
Hystrix cristata. On its former existence near Venice ; A. P. Ninni, 
Atti 1st. Venet. (5) viii. p. 588. 
Erethizon dorsalus. Description of its anatomy : St. G. Mivart, P. Z. S. 
1882, p. 271. 
Cayiidj]. 
Cavia aperea. Note on the breeding of this animal in a state of semi- 
freedom ; N. Masson, Bull. Soc. Acclim. ix. p. 464. 
