406 



HIPPOPOTAMUS. 



above the Cataracts, which was brought to Europe by Dr. Euppell' in 

 1827, and -which I have examined in the Frankfort collections (the 

 Senckenberg Museum). I have named it provisionally H. annectens, 

 from its forming a link in size between H. amphibius and //. Liberiensis. 

 The cranium is not known, and further investigations may show that it 

 is identical with II. Pentlandi. Cuvier's II. medius has proved to be a 

 species of Dugong (Halitheriiun). Next follows Cuvier's H. minor 

 (Xo. G), which is a doubtful Tetraprotodon. I range H. Liberiensis 

 (No. 7) last, from its close resemblance to the Indian Hexaprotodons, in 

 the form of tlie upper canines. 1 



Of Hexaprotodon there are three well-marked Indian species. H. 

 Iravaticus (No. 8) is a size larger than H. Liberiensis. H. Sivalensis 

 (No. 9) is less than H. amphibius; and //. Namadicus (No. 10), with 

 other strongly marked characters, is larger than H. amphibius or II. 

 Sivalensis. There are portions of every part of the skeleton showing 

 the closest resemblance to H. amphibius throughout, though it is more 

 slender in its proportions. 



Merycopotamus is a most interesting and well-marked genus, con- 

 necting Hippopotamus with Anthracotherium. The molar teeth, as in 

 the latter, are constructed on the ruminant plan; while the cranium, 

 incisors and canines, together with the leafy expansion of the angle of 

 the lower jaw, connect it with the former. It was nearly of the size of 

 H. Liberiensis. 



SYXOPSIS OF HIPPOPOTAMIDiE. 

 Gen. I. — Hippopotamus. 

 Subgenus L — Tetraprotodon. 



Tet. Major (Cuv.), European fossil, figured in ' Fauna Ant iq. 



Sival,' Plate LXII. 

 Tet. palaeindicus (Falc. and Cant.), Indian fossil, from the Valley 



of the Nerbudda, figured in 'Fauna Antiq. Sival.,' Plates 



LVIL, LVIIL, LXII. 



right side ! and only two as usual on the 

 left. The supplementary incisor about 

 1 inch projecting, and between a swan- 

 quill and tip of little finger in thickness. 

 It is projected in the same plane as the 

 middle ones, being about one-third of 

 the distance from the canine, and two- 

 thirds from the next incisor. The 

 canine of the same side diverges very- 

 much outwards, whde on the left side 

 it is erect. Further, there is a supple- 

 mentary slip of a separate tooth placed 

 like a splint on the inside and angle of 

 the right canine in the same sheath, and 

 projecting about an inch. The upper 

 and lower right canines had not been in 

 contact to wear ; there is an interval of 

 two or three inches. 



1 Note on a remarkable Hippopota- 

 mus Skull in Mr. Ball's Collection at 

 Dublin. — The specimen is the large end 

 of the skull of an adult, but not old, 

 animal. The rear baek molar in both 

 jaws is developed, and worn down on 

 the left side into a trefoil ; it is intact 

 on the right. There are six molars on 

 the left side of the lower jaw ; there are 

 five on the right, the anterior being 

 missing. There are seven molars on 

 the right side, upper jaw, the anterior 

 being isolated, and placed about one- 

 third forward on the diasteme. There 

 are six on!y on the left, the anterior one 

 being wanting. The lower jaw is very 

 remarkable, the anterior part being un- 

 symnietrieal, with three incisors on the 



