HEG ETOTHERIUM—HELICOPHORA. OO 
Hegetotherium-— Continued. 
Species: Hegetotherium mirabile Ameghino (type), and JI. strigatum Ameghino, 
from the Lower Tertiary of southern Patagonia. 
Extinct. 
Hegetotherium: nyntys, leader, chief; 67otov, wild beast. 
Helaletes Mansu, 1872. Ungulata, Perissodactyla, Lophiodontid:e. 
Am. Journ. Sci. & Arts, 3d ser., IV, 218, Sept., 1872 (sep. issued Aug. 13). 
Helatetes TROUESSART, Cat. Mamm., new ed., fasc. IV, 761, 1898 (misprint). 
Type: Helaletes boops Marsh, from the Eocene of Grizzly Buttes, near Fort 
Bridger, Wyoming. 
Extinct. Based on *'the greater portion of a skull with teeth, and the more 
important parts of the skeleton of the same individual." 
Helaletes: €Xos, marsh; dA»rys, wanderer. 
Helamys F. Cuvier, 1817. Glires, Pedetidee. 
Régne Animal, I, 202-203 footnote, 1817; 2* ed., I, 209, 1829; Nouv. Dict. Hist. 
Nat., nouv. ed., XIII, 117, 1817; Dents des Mammiféres, 254, 1825. 
Helamis F. Cuvier, Dict. Sci. Nat., X X, 341—344, 1821. 
Type: Mus cafer Pallas, from the Cape of Good Hope. 
Name antedated by Pedetes Illiger, 1811. 
Helamys: €An=eidn, the sun’s heat; “0s, mouse. 
Helarctos (subgenus of Ursus) Horsrieip, 1825. Ferze, Ursid:ze. 
Zool. Journ., II, 221-234, pl. vu, July, 1825. 
Helarctus GLocER, Hand- u. Hilfsbuch Naturgesch., pp. xxviii, 53, 1841. 
Type: Helarctos euryspilus Horsfield, from Borneo. 
Helarctos: —An=etAn, the sun's heat; apKros, bear—probably from its tropical 
habitat. 
Helatetes (see Helaletes). Ungulata, Perissodactyla, Lophiodontid:e. 
Heleotragus Kirk, 1864. Ungulata, Artiodactyla, Bovid:e. 
Proc. Zool. Soc. London, 1864, 657—658. 
Emendation of H/leotragus Gray, 1843. ‘‘The three genera //eleotragus, Adenota, 
and Aobus are most intimately related, forming together a single tolerably 
well-defined and natural genus, the subdivision of which is quite artificial 
and very inconvenient."  (p..658.) 
Helicoceras WeirHorerr, 1888. Ungulata, Artiodactyla, Bovidee. 
** Beitr. Paleeont. Oesterr.-Ung., VI, 288, pl. xvirr, 1888" (fide LyprEKKeEr, Zool. 
Record for 1888, XXV, Mamm., 51, 1890). 
Type: Helicoceras rotundicorne Weithofer, from the Pliocene beds of Pikermi, 
Greece. 
Name preoeccupied by Helicoceras D’ Orbigny, 1840, a genus of Mollusca. Replaced 
by Helicophora Weithofer, 1889 (preoccupied by Lelicophora Gray, 1842, a 
genus of Mollusca); and by Zelicotragus Palmer, 1903. 
Extinct. 
Helicoceras: £A1&, €AiKos, spiral; Képas, horn—in allusion to the spiral horns. 
Helicolophodon Rorn, 1903. Ungulata, Astrapotheroidea, Astrapotheriid:e. 
Revista Mus. La Plata, XI, 141, 1903. 
Type: Jlelicolophodon giganteus Roth, from the ‘upper Cretaceous’ of Lago 
Musters, Territory of Chubut, Patagonia. 
Extinct. Based on an upper premolar and a lower incisor. 
Helicolophodon: £A18, £A1 0s, spiral; Ad@os, crest; 66@v=d6o0vs, tooth. 
Helicophora WzrrnorEn, 1889. Ungulata, Artiodactyla, Bovid:e. 
Jahrbuch K. K. Geol. Reichsanstalt, Wien, XXXIX, Heft 1-2, p. 79 footnote, 
July 1, 1889. 
