. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Figure 19. Medial and slightly dorsal view of the right side of the mandible of C. parkeri (AMS 21434). Other authors mentioning C. siebenrocki include Ogilbv (1905), Stejneger (1909), Loveridge (1934) and Pritchard (1967). Relationships with C. rugosa and other species. The series of C. siebenrocki de- scribed in this paper shows little phenotypic variation. The greatest variation within the series is found in a single specimen (MCZ 134406), which has a vomer that separates the palatines and a very wide head. Large,
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Figure 19. Medial and slightly dorsal view of the right side of the mandible of C. parkeri (AMS 21434). Other authors mentioning C. siebenrocki include Ogilbv (1905), Stejneger (1909), Loveridge (1934) and Pritchard (1967). Relationships with C. rugosa and other species. The series of C. siebenrocki de- scribed in this paper shows little phenotypic variation. The greatest variation within the series is found in a single specimen (MCZ 134406), which has a vomer that separates the palatines and a very wide head. Large, wide heads occasionally occur in adult specimens of some other Australian chelids (Worrell, 1963), and may also in C. sieben- rocki. The differences exhibited by MCZ 134406 are probably best explained in this way. C. siebenrocki is most closely related to C. rugosa, with which it may be synony- mous, although Burbidge (1967) and Bur- bidge, et al. (1974) believe that it is distinct. The relationship between these animals remains unclear. We have com- pared the New Guinean series discussed here with the type specimen of C. rugosa and with a series of seven specimens from the Cape York Peninsula of northern Aus- tralia that have been referred to C. rugosa on the basis of locality. The type specimen of C. rugosa is only a shell (carapace and plastron). Although it has a slightly nar- rower carapace and plastron (Figs. 11, 12), it agrees in most respects with the New Guinean series and the type photographs of C. siebenrocki. The seven Cape York specimens are quite variable compared to the New Guinean series, and the sample is too small to permit any conclusions con- cerning specific status to be drawn. For the present, we prefer to simply refer to all C. rugosa-\ike turtles (including C. sie- benrocki) from northern Australia and New. Figure 20. Ventral view of the hyoid of C. parkeri (AMS 21353). Guinea as the C. rugosa complex, and defer final judgment on the relationship between
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