PALEONTOLOGY. 4()3 



Bisulcus UQdulatus E. H. I Cochlichuus angnineus E. H. 



Trisulcus laqueatiis E. H. two u. sp. 



Cochlea archimedea E. H. 



Incertd- sedia. 



Hoplichnus equus E. H. 



poledrus'E. H. 

 jEnigmiclinus multiformis E. H. 



Grumiiuclimis aljjha E. H. 

 Ampelichnus sulcatus E. H. 

 Climacodichnus corrngatus E. H. 



Of lower arthropods aud worms there may be half a dozeu uew species and two 

 new genera. 



Summarii : 



Marsupial 1 | Hexapod arthropods 24 



Paohydactylous birds 17 | Lower arthropods aud worms 16 



Leptodactylous birds 18 



Diuosaurs 28 



Reptiles and amphiliia 27 



Batrachians 16 



Chelouians 6 



Mollusca 6 



Incerta; sedis 6 



Total 165 



The class of Birds is still retained for convenience, altlioiigli the bones fonnd in 

 the west seem to point to reptijes as most probably the animals thus designated. It 

 is still a fact that such special reptilian characteristics as would be exhibited in walk- 

 ing are absent in the genera Brontozoum aud Grallator, while those creatures called 

 Dinosaurs are thus referred, either because of the marks of front feet, heels to the 

 hind feet, or of tails. The bird group is also characterized by long legs, while most 

 of the Dinosaurs had short legs, as indicated by their numerous stops. I do not 

 change the reference of a group to Chelouians, though it is not satisfactory. 



The Arthropoda are most likely to be referred to the lower classes; yet the 

 presence of only 6 feet in the impressions leads us to speak of them as Hexapods. 

 They may not be true insects, but larval forms, requiring further investigation 

 before satisfactory references can be made out. Further statement of the reasons 

 for referring various imprints to their lowly owners would involve a discussion of 

 the third part of the subject, which can not be undertaken now.' 



It will be proper to state a few facts about museums and localities before describ- 

 ing the new species. 



THE AMHERST MUSEUM. 



A few slabs have been added since 1865, and the arrangement of the rooms has 

 not been changed since the printing of the catalogue. One slab shows a Brontozoum 

 with two toes on one foot and three upon the other, as if the owner had lost a toe by 



' Of modern authors, A. G. Nathorst has treated of the invertebrate tracks most fully in his 

 Mi?moire sur quelques traces d'animaux sans vertebn^, etc., et de leur port(?e pal^oiitologique, 1880. 

 His bibliography notices several Americau authors, but he has evidently not seen the Ichnology of 



Massachusetts. 



