LIST OF ILLUSTRATIONS 



PLATES 



Notes on trematode parasites of birds 



By Edwin Linton 



Facing page 



1. Monostome trematode of the loon 36 



2. Distomes of herring gull, laughing gull, loon, and grebe 36 



3. Distomes of grebe and herring gull 36 



4. Distomes of white winged scoter 36 



5. Distomes of white-winged scoter and herring gull 36 



6. Distomes of herring guU, red-necked grebe, loon, and Arctic tern 36 



7. Distomes of Arctic tern, green heron, sanderling, and frigate bird 36 



8. Distome of laughing gull 36 



9. Distomes of surf duck and herring gull 36 



10. Distomes of herring gull, laughing guU, and ring-billed gull 36 



11. Distomes of laughing gull, ring-billed gull, and herring gull 36 



Two new nematodes op the family Strongylidae, parasitic 



IN THE INTESTINES OF MAMMALS 



By Benjamin Schwartz 



1. Phacochoerosirongylus pricei, new species 6 



2. Oesophagostomoides giltneri, new species 6 



Further consideration of the shell of Chelys and of the 

 constitution of the armor of turtles in general 



By Oliver P. Hay 



1. Carapace of Chelys fimbriata 12 



2. Carapaces of Chelys and Clemmys insculpla 12 



New HELMINTH PARASITES FROM CENTRAL AMERICAN MAMMALS 



By Emmett W. Price 



1 . Bradypostrongylus panamensis, new species 8 



2. Graphidium browni, new species and Controrchis bibliophilus, new 



species 8 



Two NEW CRABS FROM THE EoCENE OF TeXAS 



By Mary J. Rathbun 



1. Notosceles bournei from the Eocene of Texas 6 



2-3. Harpactocarcinus americanus from the Eocene of Texas 6 



