MAMMALIA. 
33 
V. Family Saccomyid^ (Baird). 
- A. Subfamily Saccomyini : — 1. Dipodomys, 2. Perognatlms. 
B. Subfamily Geomyini : — 3. Thomomys, 4. Geomys. 
Castor. 
VI. Family Castoridas (Gray). 
VII. Family SciURiDiE (Waterli.). 
A. Subfamily Sciurini: — 1. Sciiirus, 2. Sciuropterus, 3. Pteromys^ 
Tamias, 6. Spermopliilus, 6. Arctomys, 7. Cynomys. 
B. Subfamily Anomalurini \ — 8. Anomalurus. 
Ilaploodoii. 
VIII. Family IlAPLOODONTIDiE. 
IX. Family CiriNcniLLiDiE (Bonn.). 
1. Lagostomus, 2. Lagidium, 3. Chinchilla. 
4. 
X. Family Spalacopodidje (Brandt). 
A. Subfamily Octodontini (Waterh.) : — 1. Habrocomus^ 2. Capromys, 3. 
Plagiodon(tia, F. Cuv.),4. Spalacopus, 6. Octodon, 6. Ctenomys, 7. Cteno- 
dactylus, 8. Pectinator (Ileuglin). 
B. Subfamily Echinomymi (Waterh.) : — 9. Dactylomys^ 10. Cercomys, 
11. Lasiuromys, 12. Petromys, 13. Myopotomus, 14. Carterodon, 16. Aula- 
codes, 16. Mesomys, 17. Echinomys, 18. Loncheres. 
C. Subfamily Cercolabini (J. Gray) : — 19. Chsetomys, 20. Cercolabes, 21, 
Erethizon. 
XI. Family IlYSTiiiciDiE (Gray). 
A. Subfamily Hystricini (Waterh.) : — 1. Atherura, 2. Acanthion, 3. Hys- 
trix. 
B. Subfamily Cavini (Gray) 4. Dasyprocta, 6. Coelogenys, G, Hydro- 
choerus, 7. Cavia, 8. Cerodon, 9. Dolichotis. 
Second suborder DUPLICIDENTATI (111.). 
XII. Family Lagomyidai. 
Lagomys. 
XIII. Family Leporidas (Gray). 
" ^ 
Prof. Peters has read before the Academy of Sciences of Berlin a paper 
containing a systematic synopsis of the groups and genera of Murini. In the 
abstract published (Monatsber. Ak. Wiss. Berlin, 1866, Jan. 11, pp. 13-14) 
no characters of the divisions are given. 
'^Mus macropiis, sp. n.. Gray, Proc. Zool. Soc. 1866, p. 221, from the Cape 
York Peninsula.— heavanii, sp. n., Peters, Proc. Zool. Soc. 1866, p. 669, 
from Maubhoum, Burmah. 
S Lasiomys is a new genus described by Prof. Peters, Monatsber. Ak. Wiss. 
Berlin, 1866, p. 409. It is referred to a group, Dendromyes (containing Den- 
dromyes and Steatomys), distinguished from the Mures proper by incisors 
rounded anteriorly, prolonged fore claws, absence of supraorbital crests, and 
by foramina infraorbitalia equally wide above and below. It diflers from the 
other two genera in having incisors without longitudinal groove j hairs modi- 
fied into stiff flat bristles.— X. afer, sp. n., flg. 2 (skull), from Guinea. 
’q Hesperomys nudicaudus, sp. n., Peters, 1. c. p. 404. fig. 1 (skull), from Gua- 
temala. It is the type of a new subgenus, Tylomys. 
1866. [voL. III.] 
D 
