NEW YORK ACADEMY OF SCIENCES 



613 



Cohorts. The branches in the cohort column represent the 

 modified revival of a very ancient usage. The groupings are, 

 however, very general and uncertain, especially as regards 

 the branch Ungulata, because we still need to ascertain whether 

 the hoofed animals sprang from a common " Protungulata " 

 stock, as has been supposed, or whether they were more or 

 less independently derived from the Unguiculata — if the latter 

 supposition is the correct one, the term Ungulata (Storr) becomes 

 purely descriptive. 



Infra-class. The chief object of the new Infra-class division 

 is to express the fact that the Marsupials and Placentals, while 

 widely separate, are also much more closely related to each 

 other than either are to the Monotremes. 



CLASS SUB-CLASS TNFRA-CLASS COHORT SUPER-ORDER ORDER 



Mammalia I. Protothe- I. Ornithodel- Monotremata. ... 1 



ria phia. ' Protodonta 2 



'Allotheria 3 



II. Eutheria 1. Didelphia or Polyprotodonta. . 4 



Marsupialia Diprotodontia . . 5. 



'Triconodonta.. . . 6 



2. Monodelphia 1. Unguicu- j Pantotheria 7 



or Placenta- lata Pristini ( Insectivora .- 8 



lia Dermoptera 9 



Cheiroptera..... 10 



ftCreodonta 11 



■• Ferae J iZeuglodontia. . .. 12 



(Carnivora) j Fissipedia 13 



[_ Pinnipedia 14 



r5i irea \ iProglires? 15 



Uiires - ( Rodentia l6 



Tillodontia 17 



„ tj, . , ) iTseniodonta 18 



Edentata -j Xenarthra lg 



Pholidota 20 



" Tubulidentata. . . 21 



I iMesodonta 22 



2. Primates? Primates ■< Prosimii 23 



( Simiae 24 



j Perissodactyla . . 25 



3. Ungulata Diplarthra? •< lAncylopoda 26 



( Artiodactyla .... 27 



'Condylarthra.. . . 28 



'Amblypoda 29 



'Barypoda 30 



Proboscidea 31 



Sirenia 32 



Pyrotheria 33 



Hyraces 34 



fTypotheria 35 



Notungulata J Toxodontia 36 



Roth ] Astropatheroidea 37 



[Litopterna 38 



4. Cete Denticete 39 



Mysticete 40 



1 Extinct orders. 



Miss Foote and Mr. Strobell showed lantern slides of fourteen 

 photo-micrographs illustrating a few stages in the prophases 



