660 



CLASSIFICATION OF MAMMALIA. 



Family. — Macrocelid.«;. 



Genera. — Macroeelides, Rhynchocyon. 

 Family. — Erinaceim:. 



Genera. — Gymnura, Erinaceus. According to Wallace, 

 3 genera and 10 species. 

 Family. — Soricid^:. 



Genera. — Anonsorex, Diplomesidon, Croeidura, Blarina, 

 Neosorex, Sorex, Crossopus, Nectogale. 65 species. 



Family. — T alpid^;. 



Genera. — Myogale, Uropsilus, Urotrichus, Scalops, Sca- 

 panus, Scaptonyx, Talpa. 19 species. 



Family. — Potajiogalid^e. 



Genera. — Potamogale, Geogale. 

 Family. — Solenodoxtid.e. 



Genera. — Solenodon. 2 species. 



Family. — Cextetid^e. 



Genera. — Centetes, Hemicentetes, Ericulus, Microgale, 

 Oryzorictes. 8 species. 

 Family. — Chrysocholorid*. 



Genera. — Chrysocliloris, Calcochloris. 3 species. 



Order.— CETACEA. 



This is perhaps the most distinctly circumscribed and 

 natural of all the larger groups into which the Class of 

 Mammals is divided. The form is fish-like ; the head is 

 very large, amounting in some instances to one-third the 

 entire length. 



Sub-order.— MYSTACOCETI. 



WHALE-BONE WHALES. 



Genera. — Baleena, Neobalaena, Rachianecles, Megaptera, Ba- 

 laenoptera. 14 species. 



Sub-order.— ARCKMOCETI 

 is established to include certain extinct cetascans. 



Sub-order.— O DONTOCETI. 



TOOTHED WHALES. 



Family. — Physeterid/E. 



Genera. — Physeter (1 species), Kogia (2 species), Hy- 

 peroodon, Ziphius, Berardius, Mesoplodon. 

 Family. — SqualodontidjE (genera extinct). 

 Family. — Plalanistid^:. 



Genera. — Platanista, Inia, Pontoporia. 

 Family. — Delphinid^;. 



Genera. — Monodon, Delphinapterus, Phocaena, Orcella, 

 Orca, Pseudorca, Globiceplialus, Grampus, Del- 

 phinus. 



Order.— SIEENIA 



Aquatic animals, living in shallow bays and lagoons, near 

 the shore. Their food consists entirely of aquatic plants. 

 Two kinds of teeth, incisors and molars, separated by a 

 wide interval, are present. 



Family. — ManitidjE. 



Genera. — Manatus, Halicore, Rhytina. 5 species. 



Sub-class.— M ONODELPHIA. 



Order.— EDENTATA 



Either toothless animals, or having the teeth more or less 

 imperfect. 



Family. — Bradypodid*. 



Genera. — Bradypus, Cholcepus. 12 species. 



Family. — Megatheriid^e. 



This family embraces extinct forms. The great Mega- 

 therium or Gigantic Sloth is an example. 



Family. — Myrmecopagid^e. 



Genera. — Myrmecophaga, Tamandua, Cyclothurus. 

 5 species. 

 Family. — D asypodid^e. 



Genera. — Tatusia, Chlamydophorus, Dasypus, Priodon, 

 Tolypeutes. 17 species. 



Family. — Manidje. 



Genera. — Manis. 3 species. 

 Family. — OrycteropodidjE. 



Genus. — Orycteropus. 2 species. 



Sub-class.— V IDELPHIA. 



Order.— MAESUPIALIA. 



Brain small in proportion to size of animal. There are 

 always true teeth. Marsupial bones are present in both 

 sexes, of nearly all species. During the very short time 

 the embryo is retained in the uterus its nourishment seems 

 to be derived from the umbilical vesicle, the allantoic 

 vessels not reaching the surface of the chorion to form a 

 true placenta. Mamma? vary in number, and are always 

 abdominal. The young are attached to the long teats very 

 early, and the milk is injected into their mouths by con- 

 traction of the muscles of the mammary glands. 



Family. — Didelphidje. 



Genera. — Didelphys, Chironectes. 22 species. 



Family. — Dasyurid/E. 



Genera,. — Thylacinus, Dasyurus, Phascogale, Myrme- 

 cobius. 30 species. 

 Family. — PeramelidjE. 



Genera. — Perameles, Macrotis, Chceropus. 10 species. 

 Family. — MacropodidjE. 



10 genera and 56 species, according to Wallace. 



Family. — Phalangistid/E. 



Genera. — Tarsipes, Petaurus, Belideus, Acrobata, Pha- 

 langista, Phascolarctos, Kaola. 27 species. 



Family. — PhascolomyiDjE. 



Genera. — Phascolomys. 3 species. 



Sub-class.— KNITHODELPHIA. 



Order.— MONOTKEMATA. 



Family. — OrnithorhynchidjE. 



Genera. — Ornithorhynchus. 1 species. 



Family. — Echidind/e. 



Genera. — Echidna, Acanthoglossus. 3 species. 



