. Annals of the South African Museum. Annale van die Suid-Afrikaanse Museum. Natural history. South African Fossil Reptiles and Amphibia. 159 are those of D. planus. (Unfortunately, I am not aware of the exact relations of the lachrymal and the state of the occipital conclyle in the type of D. planus.} The question then arises—Can the relations of the bones in the pre- parieta region be taken as factors of generic, or even of specific, impoi'tance among the many forms of Dicynodon and its allies ? There can be little doubt that the skull ( Mus. 2364) referred to D. planus and that under di
. Annals of the South African Museum. Annale van die Suid-Afrikaanse Museum. Natural history. South African Fossil Reptiles and Amphibia. 159 are those of D. planus. (Unfortunately, I am not aware of the exact relations of the lachrymal and the state of the occipital conclyle in the type of D. planus.} The question then arises—Can the relations of the bones in the pre- parieta region be taken as factors of generic, or even of specific, impoi'tance among the many forms of Dicynodon and its allies ? There can be little doubt that the skull ( Mus. 2364) referred to D. planus and that under discussion closely resemble one another in all points save in these relations. Nevertheless, following Dr. Broom's classification, they would be placed in different genera according to. SM- FIG. 38.—Chelyrhynchus laclirymalis, Htn. Type. of skull. x -8. No. 3334. Side view the presence or absence of the preparietal bone. To settle this question, it is necessary to show that the preparietal is constant in any one species, /. e. that forms which agree in all other characters agree also in the possession, shape, .and position of the preparietal. In describing the following Auomodont species, Dicynodon platyceps, Dicynodon ictidops, Emydops longiceps, and EmydorhyncJnis palustris, Dr. Broom was able to base his descriptions upon a number of skulls in each case, and in each instance he remarks upon the close agree- ment of the individuals within any one species. Moreover, a long series of skulls in the Mus. collection referred to Dicynodon jouberti have the preparietal very constant. On the other hand, the two closely-allied skulls 2364 and 3334 differ in that the former has a i/ long narrow preparietal while the latter is without. This skull can be taken as the type of a new genus and may be. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not per
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