LIST OF CONTRIBUTORS. 97 



Leidy, Joseph. Continued. 



On two genera of fossil mammals, Eucrotaphus and Archaeo- 



thcnuni. P "50, 90 



Contributions to hclminthology. P '50, 96 



Notes on the development of the Grordius aquatieus. P '50, 98 



Description of some nematoid Entozoa infesting insects. P. 



'50, 100 



— Two new species of infusorial Entozoa. P '50, 100 



— Descriptions of three Filarige. P '50, 117 



— On the nettling organs of the Hydra. P '50, 119 



— On a fossil Rhinoceros from Missouri. P '50, 119, 121 



— Description of new genera of Vermes. P '50, 124 



— Descriptions of new species of Entozoa. P '50, 155 



— On the maxilla of a species of Palaeotherium. P '51, 170 



— On fossil tortoises from Nebraska. P '51, 172 



— On transplantation of animal tissues. P '51, 201 



— On fungus growth in the mole cricket. P '51, 204, 210 



— Contributions to helminthology. P '51, 205, 224, 239, 349 



— On a case of nigrites. P '51, 211 



— On the introduction of cancerous matter into the integument 

 of a frog. P '51, 212 



— On fungi in Cicada. P '51, 235 



— On fossil ungulates from Nebraska. P '51, 237 



— On the genus Plumatella. P '51, 261 



— On the GordiaceEe. P '51, 262, 266, 275 



— On Cristatella. P '51, 265 



— On the remains of fossil mammals. P '51, 276, 278 



— On a freshwater sponge from the vicinity of Philadelphia. 



P '51, 278 



— Corrections and additions to former papers on helmin- 

 thology, published in the Proceedings of the Academy. P 

 '51, 284 



-r— On Crocodilus antiquus. P '51. 307 



— On fossil whales. P '51, 308 



— On some American freshwater Polyzoa. P '51, 320 



— On fossil reptilian and mammalian remains. P '51, 325 



— On fossils from the Green Sand of New Jersey. P '51, 329 



— On two species of Rhinoceros from Nebraska. P '51, 331 



— On fossil teeth from Nebraska. P '52, 2 



— On Cretaceous mammals. P '52, 3 



— On a fossil tortoise from Nebraska, P '52, 34. 59 



