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Show 1897.] SPECIES O F POTAMOCHCERUS. 369 Museum-show that whilst approaching P. porcus in the strong but low apophyses above the canine, and in the breadth of the upper cranial region anterior to the postorbital processes, it is very remarkable and distinct from that of all the other species of Potamochcerus in the elongation of the hinder part of the skull backwards from the postorbital processes of the frontals. Fig. 4. Skull of Potamochozrus hassama, $, from Abyssinia (seen from above). To resume, we have the following species and varieties of the African genus Potamochcerus :- 1. Potamochcerus larvatus (F. Cuv.). Madagascar. 2. Potamochcerus chceropotamus (Desmoul.). S. and S.E. Africa. P. chceropotamus nyasce. Nyasaland (B. C. A.). P. chceropotamus dcemonls. Kilima-njaro. 3. Potamochcerus johnstoni, sp. n. N.W. Nyasaland. 4. Potamochcerus hassama (Heuglin). Abyssinia. 5. Potamochcerus porcus (L.). West Africa, from Angola to Sene-gambia and eastwards to Monbuttu (teste Schweinfurth and Emin). |