EXPLANATION OF PLATE 66 

 All figures approximately natural size 

 Pig. 1. Trophon carisaensis F. M. Anderson. Altitude, 69 mm. 

 Pig. 2. Trophon carisaensis P. M. Anderson. Altitude, 61 mm. 

 Pig. 3. Trophon ponderosum Gabb. Altitude, 56 mm. 

 Pig. 4. Trophon ponderosum Gabb. Altitude, 41 mm. 



Pig. 5. Trophon ponderosum Gabb. var. diabloensis, n. var. Altitude, 59 mm. 

 Pig. 6. Trophon gracilis Perry var. pabloensis, n. var. Altitude, 36 mm. 

 Pig. 7. Trophon gracilis Perry var. pabloensis, n. var. Altitude, 34 mm. 



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