ITHYGRAMMODON-——JAGU ARIUS. 355 
Ithygrammodon—Continued. 
Ithygrammodon: 79vs, straight; ypauun, line; 66@v=d6o0vs, tooth—in allusion 
to the upper incisors, which ‘‘are placed nearly in a straight line fore and aft." 
Ixacanthus Corr, 1868. Cete, Platanistide. 
Proe. Acad. Nat. Sci. Phila., 1868, 186, 187. 
Txocanthus MAnsCHALL, Nomenclator Zool., Mamm., 14, 1873. 
Type: Jxacanthus celospondylus Cope, from the Miocene of Charles County, 
Maryland. 
Extinct. Based on the following vertebrze: ‘‘Three dorsals, nine lumbo-sacrals, 
and one caudal." 
Iracanthus: 220s, 2200s, small of the back; dava, spine—in allusion to the 
‘ spinous character of the diapophyses of the caudal and lumbo-sacral vertebree.’ 
Ixalus Oaitpy, 1837. Ungulata, Artiodactyla, Antilocapridze? 
Proc. Zool. Soe. London, for 1836, No. xrvir, 119-120, Feb., 1837; No. xrvrir, 
135-136, June 27, 1837; Barrp, Mamm. N. Am., 666, 1857 (in synonymy). 
Type: Jralus probaton Ogilby, from British America; probably collected on the 
Franklin expedition. 
Iralus: 12aX0s, epithet of the wild goat. 
Ixocanthus (see Ixacanthus). Cete, Platanistide. 
al 
Jacalius (see Sacalius). Ferz, Canidee. 
Jacchus Grorrroy, 1812. Primates, Hapalidze. 
Ann. Mus. Hist. Nat., Paris, XIX, 118-119, 1812. 
Jaccus F. Cuvier, Hist. Nat. Mamm., V, livr. rix, pl. with 2 pp. text, Jan., 1829. 
Tacchus Gray, Proc. Zool. Soc. London, 1865, 734. 
Species, 7: Jacchus vulgaris Geoffroy (=Simiajacchus Linneeus, type), from Guiana; 
J. penicillatus Geoffroy, J. leucocephalus Geoffroy, J. auritus Geoffroy, J. hume- 
ralifer Geoffroy, J. melanurus Geoffroy, and Simia argentata Linnzeus, from 
Brazil. 
Name antedated by Callithrix Erxleben, 1777; and by Hapale Iliger, 1811. 
Jacchus: Possibly a Latinized form of 'jocko, a common name applied to a 
monkey. 
Jaculus ERXLEBEN, 1777. Glires, Dipodidze. 
Systema Regni Animalis, 404-411, 1777; W AcLER, Nat. Syst. Amphibien, 23, 1850. 
Taculus WAGNER, Suppl. Schreber’s Sáugthiere, III, 292-295, 1845. 
Species, 3: Jaculus orientalis Erxleben, from Egypt; J. giganteus Erxleben ( — Maero- 
pus giganteus), from Australia; and J. torridarum Erxleben, from the ‘torrid 
regions.’ 
Jaculus: Lat. jaculus, that which is thrown, a dart—in allusion to the animal’s 
dart-like leaps. 
Jaculus JAnockr, 1821. Glires, Dipodidee. 
“Zoologia Cayli Zwiertopismo ogolne, Warszawie, I, 26, 1821" (fide MILNr- 
Epwarps, Recherches Hist. Nat. Mamm., I, 146-147, 1868-74). 
Based on the 5-toed species of Dipus. ‘‘Jarocki réserva le nom générique de 
Dipus aux Gerboises dont les pattes postérieures sont tridactyles, et constitua 
sous le nom de Jaculus un nouveau genre pour les espéces à pattes postérieures 
pentadactyles." | (MirxE-EpwAnps.) 
Name preoccupied by Jaculus Erxleben, 1777, a distinct genus of Dipodidee. 
(See Allactaga Cuvier, 1836.) 
Jaguarius (subgenus of Panthera) Srverrzow, 1858. Fer, Felidee. 
Revue et Mag. de Zool., Paris, 2° sér., X, 386, 390, Sept., 1858. 
Type: Panthera (Jaguarius) onca (= Felis onca Linneeus), from Tropical America. 
Jaguarius: Latinized form of jaguar. ‘‘Nom barbare, que j'ai dà donner à regret 
à cesous-genreà cause de l'insuffisance de mes études classiques." (Srverrzow. ) 
