32 
ZOOLOGICAL LITERATURE. 
* The fifth and sixth upper grinders with two roots (?) j the sixtli 
upper partly behind the hinder edge of the zygomatic arch. Arctocephalus — 
A, delalandii. 
4 ** The fourth, fifth, and sixth upper grinders with two distinct 
diverging roots j the fifth in a line with the hinder edge of the zygomatic 
arch. JEuotaria — A. nigrescem. The author remarks that Phoca falldandica 
of Shaw and Hamilton is at present indeterminable, and cannot be referred as 
a synonym to A. nigrescens. 
^ *** Fourth, fifth, and sixth 'upper grinders with two diverging 
roots ; the fifth upper grinder entirely behind the hinder edge of the zygo- 
matic arch. The palate narrow. Gypsophoca — O. cinerea. 
\ Arctocephalus falklandicus. Prof Burmeister describes and figures a skull 
in Ann. & Mag. Nat. Hist, xviii. p. 99, pi. 9. figs. 1-4, which, according 
to Dr. Gray (ibid. p. 234), is probably the young of A. hookeri, and according 
to Professor Peters Otaria falldandica (Shaw). Monatsber. Ak. Wiss. Berlin, 
1866, p. 670. 
HOSORES. 
Prof. Lilljeborg (/. c.) has studied the literature on the ani- 
mals of this order with the view of arranging the genera, groups, 
and families systematically. He gives full descrij)tions of the 
characters of genera and higher divisions, adding synoptic 
tables of the genera of each group. The distinction of species 
is not within the scope of this memoir. The arrangement pro- 
posed is the following : — 
First suborder SIMPLICIDENTATI. 
I. Family Murid.® (Gray). 
A. Subfamily Murim.» 
a. Section Mures : — First tribus, dfures proprii : 1. Mus, 2. Acanthomys, 
o. Cricetomys, 4. Saccostonius, 5. Cricetus, 6. Pseudomys, 7. Hapalotis, 8. 
Phlceomys, 9. Dendromys, 10. Steatomys, 11. Pelomys. — Second tribus Sig~ 
madontes : 12. Beithrodon, 13. Acodon, 14. Hesperomys, 15. Holochilus, 16. 
Oxymicterus, 17. Neotoma, 18. Sigmodon, 19. Drymomys, 20. Nectomys. — 
Third tribus Merionides : 21. Otomys, 22. Meriones, 23. Bhombomys, 24. 
Malacothrix, 25. Mystromys, 26. Psammomys, 27. Spalacomys. 
b. Section Sminthi: — 28. Sminthus. 
c. Section ITydromxjes : — 29. Hydromys. 
B. Subfamily Arvicolim\ — 1. Fiber, 2. Arvicola, 3. Cimiculus (Wagl.), 
4. Myodes. 
II. Family SPALACiDiE (Brandt). 
A. Subfamily Myospalacini (=PrismatodontcSf Brandt) : — 1. Ellobius, 2. 
Myospalax. 
B. Subfamily Spalacini {—Rhizodontes, Brandt) : — 3. Spalax, 4. Bhizo- 
mys, 6. Heterocephalus, 6. Bathyergus, 7. Georhychus, 8. Heliophobiiis. 
III. Family DiPODiDiE (Jiiger). 
A. Subfamily Dipodini (Brandt) : — 1. Dipus, 2. Alactaga. 
B. Subfamily Jaculini (Brandt) : — 3. Jaculus. 
C. Subfamily Pedetini (Brandt) : — 4. Pedetes. 
IV. Family Myoxidje (Waterh.). 
^Fyoxus. 
