308 



SCIENCE. 



[N. S. Vol. XIX. No. 477. 



primitive group of reptiles, by Cope and Baur. 

 (2) The separation of the Anoniodontia, Che- 

 Ionia and Sauropterygia as reptiles with a 

 single temporal arcade, by Smith Woodward 

 and Broom. (3) The affiliation of the Ich- 

 thyosaur with the two-arched rather than 

 single-arched reptiles, by Baur and McGregor. 

 (4) The recognition ■ of Sphenodon as the an- 

 cestral type of the two-arched reptiles, by 

 Baur and others. (5) Separation of the 

 reptiles into two great groups of single-arched 

 and two-arched types, by Smith Woodward 

 and Broom. (6) The demonstration that 

 reptiles are separated not only by the struc- 

 ture of the temporal arch but by many funda- 

 mental characters into two distinct groups, by 

 Osborn and McGregor (1902). (7) Conse- 

 quent division of the Eeptilia into two sub- 

 classes Synapsida and Diapsida, by Osborn 

 (1903). (8) The proposal of the Diaptosauria 

 to include all of the most primitive two-arched 

 reptiles without armature, by Osborn (1903). 

 (9) The classification of the Reptilia accord- 

 ing to the accompanying table (1903^). 



CLASS EEPTILIA. 



I. Subclass Synapsida, Osborn. 



1. Order Cotylosauria, Cope [= Pareiasauria, 



Seeley] . 

 Family Diadeetidfe. 

 Family Pariotiohidae. 

 Family Pareiasauridse. 



2. Superorder Anomodontia, Owen [^Thero- 



morpha. Cope, in part]. 

 Order I. Thekiodontia, Owen. 



Suborder I. Tlierocephalia. 



Suborder II. Cynodontia, Owen. 

 Order II. Dictnodontia, Owen. 



Inc. Sedis. 

 Order III. Placodontia, Owen. 



3. Order Sauropterygia. 



Suborder I. Simosauria, Gervais [= Notho- 



sauria] . 

 Suborder- II. Plesiosauria. 



4. Order Testudinata. 

 Suborder I. Pleurodira. 

 Suborder II. Cryptodira. 

 Suborder III. Trionyehia. 



II. Subclass Diapsida, Osborn. 



1. Superorder Diaptosauria, Osborn. 

 Order I. Procolophonia, Seeley 

 Order II. Protorosauria, Seeley. 



Order III. Proganosauria, Baur. 

 Order IV. Gnathodontia, Owen. 

 Order V. Pelycosauria, Cope. 

 Order VI. Choristodera, Cope. 

 Order VII. Rhykchocephalia, Giinther. 



2. Order Para^uchia, Huxley. 

 Suborder I. Aetosauria. 

 Suborder II. Phytosauria. 



3. Order Ichtiiyosauria, Blainville, 1835 



[^ Ichthyopterygia, Owen, 1839]. 



4. Order Crocodilia. 

 Suborder I. Mesosuchia. 

 Suborder II. Eusuohia. 

 Suborder III. Thalattosuchia. 



5. Superorder Dinosauria, Owen. 

 Order I. Theropoda, Marsh. 



Suborder I. Megalosauria [^ Thecodontia, 



Owen] . 

 Suborder II. Compsognatha, Huxley. 

 Order II. Opisthoccelia, Owen [^Sauro- 



poda. Marsh]. 

 Order III. Ornithopoda, Cope [= Preden- 

 tata. Marsh]. 



6. Superorder Squamata. 

 Order I. Lacertilia. 

 Order ,11. Mosasauria. 

 Order III. Ophidia. 



7. Order Pteeosauria. 



Miss Fielde's paper, on the ' Sense of- Smell 

 in Ants,' described her experiments with many 

 species of these insects. Each species appears 

 to have its distinctive odor, discernible by 

 other ants. Within each species there are also 

 differences of odor, dependent on the age of 

 the colony and the age of the queen from 

 whose eggs its inmates are produced. The 

 ant's organs of smell are its antennae, in which 

 the joints are as a series of noses, each having 

 a special function. The distal joint appre- 

 ciates the nest-aura informing the ant 

 whether it is in its own nest or in that of an 

 enemy. The second joint discriminates be- 

 tween the odors of ants of the same species as 

 itself, but of different colonies. The third 

 joint discerns the scent of the track laid down 

 by the ant's own feet, and enables the ant to 

 return upon any route that has been pre- 

 viously traversed. The fourth and fifth joints 

 smell the larvse and pupae, and the removal of 

 these joints disables the ant from further care 

 of the inert young. The sixth and seventh 

 joints make known to the ant the presence of 



