: ACOELOHYRAX— —ACROBATES 15 
Acoelohyrax AwEGHniNo, 1902. Ungulata, Hyracoidea, Archzeohyracidee. 
Bol. Acad. Nae. Cien. Córdoba, XVII, 10-11, May, 1902 (sep. pp. 8-9). 
Type: Acoelohyrax coronatus Ameghino, from.the upper part of the Notostylops 
beds of Patagonia. 
Extinct. 
Acoelohyrax: &, without; K61A0s, hollow; -- Hyrax. 
Acoelcdus AMEGHINO, 1897. Ungulata, Hyracoidea, Acoelodide. 
[La Argentina al través de las Ultimas Epocas Geol., 18, 1897—nomen nudum. ] 
Acelodus AMEGHINO, Bol. Inst. Geog. Argentina, XVIII, 454, Oct. 6, 1897. 
Type: Acoelodus oppositus Ameghino, from the ‘Cretaceous’ of Patagonia. 
Extinct. Based on a fragment of the mandible. 
Acoelodus: a, without; KoiAn, hollow; odo0vs, tooth. ‘‘Molaires inférieures 
toutes bilobées. . . Lobe antérieur sans cavité interne, ce caractére servant à 
distinguer les dents de celles des Adiantidés" (AMEGHINO). 
Acoessus Corr, 1881. Ungulata, Perissodactyla, Equidze. 
Proc. Am. Philos. Soc., XIX, 380, 397, May 14-16, 1881. 
Type: Hyracotherium siderolithicum Pictet, from the Lower Eocene of Mauremont, 
Switzerland. 
Extinct. 
Acoessus: &k), a sharp point; 7667, less, weaker—in allusion to the character: 
** Vs of inferior molars probably incomplete. '' 
Acomys I. Grorrroy, 1838. Glires, Murid:e, Murine. 
Ann. Sci. Nat., Paris, 2e sér., X, Zool., 126, Aug., 1838. 
Acanthomys Lesson, Nouv. Tableau Régne Animal, Mamm., 135, 1842; Gray, 
List Spec. Mamm. Brit. Mus., pp. xxiii, 108, 1843. 
Type: Mus cahirinus E. Geoffroy, from Egypt. 
Acomys: cr), a sharp point; 4c, mouse—from the spines. The fur is so spiny 
that when the spines are erect the animal is said to be almost indistinguishable 
at first glance from a diminutive hedgehog. 
Aconaemys AmeEGHINo, 1891. Glires, Octodontid:e. 
Revista Argentina Hist. Nat., I, Entr. 4a, 245, Aug. 1, 1891. 
Acondemys ScLATER, Geog. Mamm., 280, 1899 (misprint). 
New name for Schizodon Waterhouse, 1842, which is preoccupied by Schizodon 
Agassiz, 1829, a genus of Pisces. 
Aconaemys: &kovn, whetstone; 00s, mouse. (See explanation under Schizodon. ) 
Acosminthus GrocEn, 1841. Glires, Murid:ze, Murine. 
Hand- u. Hilfsbuch Naturgesch., I, pp. xxx, 95, 1841; THomas, Ann. & Mag. Nat. 
Hist., 6th ser., XV, 190, Feb. 1, 1895. 
Species: Mus cahirinus Geoffroy, from Egypt; and M. dimidiatus Rüppell, from 
the region near Mount Sinai, Arabia. 
Acosminthus: à), a sharp point; 6uzv60s, poetic word for mouse—in allusion to 
the spiny fur (see explanation of Acomys). 
Acotherulum Gervais, 1850. Ungulata, Artiodactyla, Suide. 
Comptes Rendus, Paris, XXX, No. 19, 604, Jan.-June, 1850. 
Type: Acotherulum saturninum Gervais, from the Upper Eocene deposits near A pt, 
Vaucluse, France. 
Extinct. 
Acotherulum: &k7), a sharp point; dimin. of 67p£ov, wild beast—in allusion to the 
four conical cups on the upper molars, and also to the small size of the animal. 
Acrobates (subgenus of Petaurus) DEsMAnEST, 1817. — Marsupialia, Phalangeridze. 
Nouv. Dict. Hist. Nat., XXV, 405-406, 1817; WarERHOUSE, Cat. Mamm. Mus. 
Zool. Soc. London, 2d ed., 68, 1838 (raised to generic rank); THomas, Cat. 
Marsup. and Monotrem. Brit. Mus., 136-138, 1888. 
Acrobata Desmarest, Mammalogie, I, 270-271, 1820. 
Type: Didelphis pygmxa Shaw, from New South Wales, Australia. 
Acrobates: akpofaros, going to the top; from &«poffaréc, to climb aloit—in 
allusion to the animal's agility and power of leaping. 
