eo 
DICROCY NODON —DIDELPHIS. 99 
Dicrocynodon— Continued. 
New name for Diplocynodon Marsh, 1880, which is preoccupied by Diplocynodon 
Pomel, 1846, a genus of Reptilia. 
Extinct. 
Dierocynodon: dikpoos, cleft; Kkuvdd@v=Kvy0dovs, canine—in allusion to the 
large canine which is inserted by two fangs. (See Diplocynodon. ) 
Dicrostonyx GLocGER, 1841. Glires, Murid:e, Microtinz. 
Hand- u. Hilfsbuch Naturgesch., I, pp. xxxi, 97, 1841; THomas, Ann. & Mag. 
Nat. Hist., 6th ser., XV, 190, 192, Feb. 1, 1895; MirwER, North Am. Fauna, 
No. 12, pp. 16, 38-40, pls. 1, 11, text figs. 14, 15, July 23, 1896. 
The genus includes the North American Lemmings, with ‘‘ highly peculiar 
(apparently double) foreclaws." "Type not mentioned, but according to Miller 
(l. c., p. 38), **an American species, probably Mus hudsonius Pallas," from 
Labrador. 
Dicrostonyx: dixpoos, forked, bifurcated; Ovvé, claw—in allusion to the form of 
the two middle fore claws in winter. The bulbous part beneath the claw 
grows out until it equals or exceeds the latter, thus giving the appearance of a 
double claw. 
Dicyclotherium E. Grorrroy, 1837. Ungulata, Proboscidea, Elephantid:e. 
Comptes Rendus, Paris, IV, No. 4, pp. 119, 120, pl. fig. 1, Jan.-June, 1837. 
Type: Elephas primigenius Blumenbach, from the Pleistocene of Europe. 
Extinct. 
Dicyclotherium: 61-, two; KUKAos, cycle; 6npiov, beast—in reference to the age of 
the type species. ‘1? Elephas primigenius aurait, par un miracle de la Provi- 
- dence, appartenu à deux époques, à deux cycles." 
Didactyles* F. Cuvier, 1829. Edentata, Myrmecophagid:e. 
Diet. Sci. Nat., LIX, 501, 1829. 
Didactyla Lists, Climats, Géol., Faune, et Géog. Botanique Brésil, 356, 1872. 
Type species not mentioned. Les Didactyles, Didactyles. Ils se distinguent 
des tamanduas en ce qu'ils n'ont que deux doigts au lieu de quatre aux pieds 
de devant." (See Cyclopes Gray, 1821.) 
Didactyles: 61-, two; ó&krvAos, finger. 
Dideilotherium AmEGHINo, 1889. Monotremata (Dideilotheride ). 
Cont. Conocimiento Mamíf. Fósil. Repub. Argentina, in Act. Acad. Nac. Cien., 
Córdoba, VI, 920-921, pl. xr, fig. 22, 1889. 
New name for Delotherium Ameghino, 1889, which is preoccupied by Deilotherium 
Filhol, 1882. 
Extinct. 
Dideilotherium: 61-, two; + Deilotherium—i. e., the second genus named Deilo- 
therium (?). 
Didelphis] Linnaus, 1758. Marsupialia, Didelphyid:e. 
Systema Nature, 10th ed., I, 54-55, 1758; 12th ed., I, 71-72, 1766; THomas, 
Cat. Marsup. & Monotrem. Brit. Mus., 316, 1888 (type fixed). 
Didelphys ScngEBER, Sáugthiere, III, 532-556, pl. 145, 1776; pls. 146a-152, 1777. 
Species 5, from North and South America: Didelphis marsupialis Linnzeus (type), 
D. philander Linn:us, D. opossum Linn:eus, D. murina Linn:eus, and D. dorsigera 
Linneeus. 
Didelphis: 61-, two; deA@vs, womb—in allusion to the pouch in which the 
young are placed immediately after birth, and in which they are carried until 
able to care for themselves. 
* This is not a plural form of a French name, but is used as a valid generic name. 
f Evidently a misprint, but adopted as the original spelling and the form used by 
Linn:eus. 
