LEPTONY X—LESTODON. 3738 
Leptonyx (subgenus of Lutra), Lesson, 1842. Fer:e, Mustelide. 
Nouv. Tableau Régne Animal, Mamm., 72, 1842. 
Type: Leptonyx barang Lesson (=Lutra leptonix Horsfield?), from Java or 
Sumatra. 
Name preoccupied by Leptonyx Swainson, 1821, a genus of Birds; and by Leplonyx 
Gray, 1837, a genus of Phocidee. 
Leptoreodon Worrman, 1898. Ungulata, Artiodactyla, Agriochceridee. 
Bull. Am. Mus. Nat. Hist., X, 95-97, fig. 1, Apr. 9, 1898. 
Type: Leptoreodon marshi Wortman, from the upper Eocene of the Uinta Basin, 
northeastern Utah. 
Extinct. 
Leptoreodon: Aezrós, small, slender; +Oreodon—in allusion to the bones of the 
limbs and feet, which are more slender than those of Oreodon. 
Leptosiagon Owen, 1874. Marsupialia, Macropodidee. 
[Proe. Roy. Soc. London, XXI, No. 145, p. 386, 1873—subgenus, nomen 
nudum]; Phil. Trans. Roy. Soc. London, CLXIV, pt. 1r, 785-786, pl. rxxvr, 
figs. 11-15, 1874. 
Type: Leptosiagon gracilis Owen, from the Pleistocene of Queensland, Australia. 
Name preoccupied by Leptosiagon Trask, 1857, a genus of Vermes. 
Extinct. Based on ‘a portion of the right mandibular ramus.’ 
Leptosiagon: Aezrós, slender; 61ay@r, jawbone. 
Leptotherium Lunn, 1838. Ungulata, Artiodactyla, Cervidze? 
Overs. K. Danske Vidensk. Selsk. Forhandl., Kjóbenhavn., 1838, 13; Ann. Sci. 
INat-, Paris}. 2° sér., X] Zool., 222, 232, Ajpr.; 1839. 
Leplotherium Lund, Echo du Monde Savant, Paris, 6° ann., No. 430, p. 245, Apr. 
175418997 
Species: Leptotherium majus Lund, and L. minus Lund, from the bone caves between 
the Rio das Velhas and Rio Paraopeba, Minas Geraes, Brazil (alt. 2,000 feet). 
Extinct. 
Leptotherium: Aezrós, small, slender; 67píov, wild beast. 
Leptotragulus Scorr & OsBonN, 1887. Ungulata, Artiodactyla, Camelid:e. 
Proc. Am. Philos. Soc.; X XIV, No. 126, pp. 258-259, Nov. 2, 1887; Scorr, Trans. 
Am. Philos. Soc., new ser., XVI, pt. 111, 479-486, pl. vir figs. 9-16, Aug. 20, 1889. 
Type: Leptotragulus proavus Scott & Osborn, from the Eocene (Uinta) of White 
River, northeastern Utah. 
Extinct. Based on the mandible and inferior dentition. 
Leptotragulus: Aezrós, small, slender; + Tragulus—in allusion to the mandible, 
which is very slender in comparison with that of Protoreodon. 
Lepus Linnaus, 1758. Glires, Leporidee. 
Systema Naturze, 10th ed., I, 57-58, 1758; 12th ed., I, 77-78, 1766; Brisson, Reg- 
num Animale, in Classes IX distrib., 2d ed., 13, 93-97, 1762; W. L. SCLATER, 
Mamm. S. Africa, II, 92-97, figs. 113-114, 1901 (type fixed). 
Species, 4: Lepus timidus Linnzeus (type), and £L. cuniculus Linnzeus from Europe; 
L. capensis Linnzeus, from the Cape of Good Hope; and L. brasiliensis Linnzeus, 
from Brazil. 
Lepus: Lat., rabbit, hare. 
Lestodon Gervais, 1855. Edentata, Megatheriide. 
Comptes Rendus, Paris, XL, No. 20, p. 1114, séance 14 May, 1855; Expd. Comte de 
Castelnau Amérique du Sud, I, pt. t, Mamm. Foss., 46-48, pl. xir, figs. 1, 2, 1855; 
Brown, Bull. Am. Mus. Nat. Hist., N. Y., XIX, 570, Oct. 28, 1903 (type fixed). 
Species: Lestodon armatus Gervais (type), from the province of Buenos Aires, 
Argentina; and L. myloides Gervais, from Argentina (?), locality not stated. 
Extinct. 
