ILLUSTRATIONS XI 



Three New Chigger Mites of the Genus Trombicula from 

 Panama, with a Key to the Known Adults of Trombicula 

 OF the New World 



By H. E. Ewing 



Page 



1. Ventral view of Trombicula trifurca, new species 2 



2. Ventral view of male of Trombicula cavernarum, new species 4 



3. Dorsal view of Trombicula horninis, new species 5 



A New Species of Extinct Turtle from the Upper Pliocene 



OF Idaho 



By Charles W. Gilmore 



1 . Carapace of Pseudemys idahoensis 2 



2. Plastron of Pseudemys idahoensis 3 



3. Skull of Pseudemys idahoensis (left view) 5 



4. Skull of Pseudemys idahoensis (superior and inferior views) 6 



5. Hyoid of Pseudemys idahoensis 7 



Descriptions of New and Imperfectly Known Species and 

 Genera of Gobioid and Pleuronectid Fishes in the United 

 States National Museum 



By Isaac Ginsburg 



1 . Eleolrica cableae, new species 11 



2. Gobulus crescentalis (Gilbert) 14 



3. A ventral view of Gobulus crescentalis (Gilbert) showing the ventral 



disk 14 



Description of a Tick, Dermacentor halli, from the Texas 

 Peccary, with a Key to the North American Species of 

 Dermacentor 



By Allen Mcintosh 



1 . Dermacentor halli (male and female) 2 



A New Fresh-Water Sponge from South Carolina 



By James T. Penny 



1-9. Spongilla discoides, new species 3 



Camtostroma, a Lower Cambrian Floating Hydrozoan 

 By Rudolph Ruedemann 



1. Diagrammatic cross section of the holotype of Camptostroma roddyi 5 



2. Vertical section of Camptostroma roddyi 5 



