527. Chrlstensen, R. M. 1975. 40 years ago. Chelonia 2(4): 17. (G. 



polyphemus ) 



528. Chrlstensen, R. M. 1976. Desert tortoises, ORVs and the BLM. 



Chelonia 3(1): 2-6. (G. agassizii ) 



529. Conant, R. 1975. A field guide to reptiles and amphibians of eastern 



and central North America, 2nd ed. Houghton Mifflin Company, 

 Boston. 429 pp. ( Gopherus spp., p. 71; G. berlandieri , pp. 72-73, 

 PI. 4, Map 32; G. polyphemus , pp. 71-72, 235, 348, 350, PI. 4, Map 

 34) 



530. Crampton, B. 1972. The desert tortoise. Animals 14: 204-205. (G. 



agassizii ) 



531. Crandall, R. S. 1975. I dig tortoises! Chelonia 2(4): 8-9. (G. 



agassizii ) 



532. Desert Tortoise Preserve Committee, Inc. 1975a. Desert Tortoise 



Preserve. Chelonia 2(2): 19-20. (G. agassizii ) 



533. Desert Tortoise Preserve Committee. 1975b. (Advertisement). Chelonia 



2(4): 15. (G. agassizii ) 



534. Dessauer, H. C. , and W. Fox. 1964. Electrophoresis in taxonomic 



studies illustrated by analyses of blood proteins. Pages 625-647 in 

 C. A. Leone, ed. Taxonomic biochemistry and serology. Ronald Press 

 Company, New York. (G. f lavomarginatus , p. 636) 



535. Dickinson, L. 1976. (Letter). Turtle Hobbyist 1(6): 2. (G. 



agassizii , G. berlandieri ) 



536. Domning, D. P. 1976. (Book review). Chelonia 3(1): 8-9. ( Gopherus 



spp., p. 8) 



537. Douglass, J. F. 1975. Studies of the gopher tortoise, Gopherus poly - 



phemus , in Egmont Key National Wildlife Refuge. Unpubl. Prog. Rep., 

 U. S. Fish Wildl. Serv., Refuge Permit No. 4-75-1. 4 pp. 



538. Douglass, J. F. 1976a. Studies of the gopher tortoise, Gopherus 



polyphemus , in Egmont Key National Wildlife Refuge. Unpubl. Prog. 

 Rep. No. 2, U. S. Fish Wildl. Serv., Refuge Permit No. 4-75-1. 2 pp. 



539. Douglass, J. F. 1976b. The mating system of the gopher tortoise, 



Gopherus polyphemus , in southern Florida. M. A. Thesis, University 

 of South Florida, Tampa. 79 pp. (G. agassizii , G. berlandieri , G. 

 f lavomarginatus , G, polyphemus ) 



540. Douglass, J. F. 1976c. Patterns of mate-seeking and burrow use in a 



southern Florida population of Gopherus polyphemus . Herpetol. Rev. 

 7: 80. (Abstr.) 



541. Douglass, J. F. 1976d. Abnormalities of scutellation in a population 



of Gopherus polyphemus (Reptilia, Testudinidae). Unpubl. MS. 5 pp. 



542. Douglass, J. F. 1976e. Refugia of juvenile gopher tortoises, Gopherus 



polyphemus (Reptilia, Testudines, Testudinidae). Unpubl. MS. 5 pp. 



543. Douglass, J. F. 1976f. Clutch size in tortoises of the genus Gopherus . 



Unpubl. MS. (G. agassizii , G. berlandieri , G. f lavomarginatus , G. 

 polyphemus ) 



544. Douglass, J. F. , and J. N. Layne. 1976. Burrow constancy in a southern 



Florida population of the gopher tortoise, Gopherus polyphemus . 

 Unpubl. MS. 6 pp. (G. agassizii , G. berlandieri , G. f lavo- 

 marginatus , G. polyphemus ) 



545. Douglass, J. F. , J. N. Layne, and C. E. Winegamer. 1976. Thermo- 



regulation and activity of the gopher tortoise, Gopherus polyphemus , 

 in southern Florida. Unpubl. MS. 42 pp. (G, agassizii , G. ber - 

 landieri , G. f lavomarginatus , G. polyphemus ) 



546. Douglass, J. F., and C. E. Winegamer. (in press). Predators of eggs 



and young of the gopher tortoise, Gopherus polyphemus (Reptilia, 

 Testudines, Testudinidae), in southern Florida. J. Herpetol. 11: 

 236-238. (G. agassizii , G. berlandieri , p. 237; G. polyphemus ) 



