PACA—PACHYCYNODON. 493 
iE 
Paca G. Fiscner, 1814. Glires, Dasyproctide. 
Zoognosia [I, 3d ed., 14, 1813—nomen nudum], III, 85-88, 1814; Liars, Climats, 
Géol., Faune et Géog. Botanique Brésil, 537—539, 1872. 
Type: Paca maculata Fischer (= Cavia paca Erxleben), from Guiana. 
Paca: Span., Port. paca; from Brazilian pak, paq, the native name for the spotted 
cavy. 
Pachochoerus (‘GEOFFROY’) RAFINESQUE, 1815. Ungulata, Artiodactyla, Suidze. 
RarrNESQUE, Analyse de la Nature, 56, 1815 (nomen nudum). 
Name quoted by Rafinesque and credited to Geoffroy without reference, date, 
or mention of any species. Possibly a misprint; no such name published by 
Geoffroy has been found. 
Pachocherus: waxvs, thick ;* yotpos, hog. 
Pachurus RarrNEsQUE, 1815. Ungulata, Artiodactyla, Suidee. 
Analyse de la Nature, 56, 1815. 
New name for Pachocherus Geoffroy (‘ Pachurus R. Pachocherus Geof.’). 
Pachurus: maxvs, thick; o?pd, tail. 
Pachyacanthus Branpr, 1871. Sirenia, Halitheriidee? 
Bull. Acad. Imp. Sci. St.-Pétersbourg, X VI, 564-565, Noy. 13, 1871; Sitzungsber. 
Math.-Nat. Cl. K. Akad. Wiss., Wien, LXV, Iste Abth., 261-262, 1872; 
Mém. Acad. Imp. Sci. St.-Pétersbourg, 7° sér., XX, 166-188, Taf. xrv-x vri, 1873. 
Species: Pachyacanthus suessii Brandt, and P. trachyspondylus Brandt, from the 
Miocene of Hernals and Nussdorf, near Vienna, Austria. 
Extinct. 
Pachyacanthus: wayvs, thick; &xav6a, spine. 
Pachyeena Corr, 1874. Creodonta, Mesonychide. 
Rept. Vert. Foss. New Mexico, 13, Nov. 28, 1874; Ann. Rept. Chief of Engineers, 
U. S. A., App. F F 3, 1874, 601. 
Type: Pachyxna ossifraga Cope, from the Wasatch Eocene of New Mexico. 
Extinct. ‘‘ Established on a single superior molar tooth." 
Pachyena: za xs, thick; + feminine ending -azv« (see Oxyena)—from the upper 
molar, in which the cutting edge is absent and replaced by a conical tubercle. 
Pachybiotherium AMEGHINO, 1902. Marsupialia, Microbiotheriidee. 
[Anal. Soc. Cien. Argentina, LI, 77, Mar.-Apr., 1901—nomen nudum. ] 
Bol. Acad. Nac. Cien. Córdoba, XVII, 123-124, May, 1902 (sep. pp. 55-56). 
Type: Pachybiotherium acclinus Ameghino, from the Patagonian formation 
(Eocene) of Patagonia. 
Extinct. Based on an incomplete left mandible containing nearly all the 
molars. 
Pachybiotherium: zaxyvs, thick; ios, life; 97píov, wild beast. 
Pachycetus VAN BENEDEN, 1883. Cete, Balzenide. 
Bull. Acad. Roy. Sci. de Belgique, 3* sér., VI, No. 7, pp. 31-32, 1883. 
Species: Pachycetus robustus Van Beneden, and P. /umilis Van Beneden, from the 
phosphate beds between the Elbe and the Weser, Germany. 
Extinct. Based on ‘deux fragments de cótes." 
Pachycetus: maxvs, thick, stout; «7)rc;, whale 
de la céte.”’ 

**à cause de la grande épaisseur 
Pachycynodon ScurossEen, 1887. Feree, Canidee. 
ScHLossER, in Roger's Verzeichniss Foss. Siugethiere, Bericht Naturwiss. Ver. 
Augsburg, XXIX, 124, 1887; *'ScnrossER, Beitr. Palaeont. Oesterr.-Ungarns 
und Orients, VII, 253, 1888." 


* The prefix Pachy-, indicating a thick, stout form, and referring either to the whole 
animal or some part, usually requires no further explanation, 
