930 INDEX GENERUM MAMMALIUM. 
Didelphodon Manmsu, 1889. Marsupialia, Cimolestide. 
Am. Journ. Sci. & Arts, 3d ser., XXXVIII, 88-89, pl. 1v, figs. 1-3, July, 1889 
Type: Didelphodon vorax Marsh, from the Cretaceous ( Laramie) of Wyoming. 
Name preoccupied by Didelphodus Cope, 1882, a genus of Creodonta. Replaced 
by Didelphops Marsh, August, 1889. 
Extinct. Based on a lower molar. 
Didelphodon: Didelphis; ó8c v = ó60vs, tooth—in allusion to the crown of the 
lower molar, which resembles that of Didelphis. 
Didelphodus Corr, 1882. Creodonta, Proviverridz. 
Am. Naturalist, XVI (for June), 522, May 20, 1882; Tert. Vert., pp. 283-285, pl. 
xx1v* fig. 13, p. 695, 1885 (date of publication, under Lctocion). 
Type: Deltatherium absarokx Cope, from the Eocene (Wasatch) of the Big Horn 
River, Wyoming. 
Extinct. 
Didelphodus: Didelphis; 6500s, tooth—‘‘an opossum-like animal [whose] deli- 
cately acute teeth indicate a diet of insects, which no doubt abounded during 
the Wasatch epoch." (Copr.) 
Didelphops Mansu, 1889. Marsupialia, Cimolestid:e. 
Am. Journ. Sci. & Arts, 3d ser., XXXVIII, 179, Aug., 1889.* 
New name for Didelphodon Marsh, July, 1889, which is preoccupied by Didel- 
phodus Cope, 1882. 
Didelphops: Didelphis; 6, aspect. 
Didelphys (see Didelphis). Marsupialia, Didelphyid:e. 
Didermocerus} DBnookzs, 1828. Ungulata, Perissodactyla, Rhinocerotidze. 
** Cat. Anat. & Zool. Museum of Joshua Brookes, London, 75, 1828"! (previous 
to July 14). 
Type: Didermocerus sumatrensis (= Rhinoceros sumatrensis Cuvier), from Sumatra. 
Didermocerus: 61-, two; ó£pua, skin; Képas, horn—from the two horns, which 
are composed of a mass of hardened epidermal cells,.growing from a cluster 
of long dermal papille. (FLowrr & LyprEKKER, Mamm., Living & Extinct, 
403, 406. ) 
Didolodus Amrcuino, 1897. Ungulata, Condylarthra, Phenacodontidee. 
La Argentina al través de las Ultimas Epocas Geológicas, 10, 18, 1897; Bol. 
Inst. Geog. Argentino, X VIII, 437—459, fig. 22, Oct. 6, 1897. 
Didolophus 'TRovEssART, Cat. Mamm., new ed., fasc. 1v, 723, 1898; C. O. Water- 
house, Index Zool., 107, 1902 (misprint). 
Type: Didolodus multicuspis Ameghino, from the ‘Cretaceous’ of Patagonia. 
Extinct. 
Didolodus: 61-, two; 8óAos, deceit; óÓ ovs, tooth. 
Didymictis Corr, 1875. Creodonta, Viverravidze. 
Syst. Cat. Vert. Eocene New Mexico, 5, 11, Apr. 17, 1875; WonTMAN & MaATTHEW, 
Jull. Am. Mus. Nat. Hist., N. Y., XII, 136, June 22, 1899. 
Type: Limnocyon protenus Cope, from the Eocene of New Mexico. (Equals 
Viverravus Marsh, 1872.—W onRTMAN & MaArrTHEV, l. c.) 
Extinct. 
Didymictis: diSvjcos, double, twofold; Z«r:s, weasel—in allusion to the two 
trochlear faces of the astragalus. 
Didymodon Br4kz, 1863. Ungulata, Artiodactyla, Anoplotheriid:e. 
Geologist, London, VI, 8-11, pl. r1, figs. 1 & 2, Jan., 1863. 
Type: Didymodon vauclusianum Blake, from the Eocene of Vaucluse, France. 

* Didelphops is said to have been previously proposed in the errata (of the July 
number ?), but the reference has not been found. 
f This name is open to question, as it was published in a sale catalogue. 
