158 Proceedings of the Royal Physical Society. 



sufficient to warrant the separation of the animal possessing 

 it into distinct genus, then the present species is entitled to 

 that place. 



It is as yet only known by the skull, which was sent by 

 Mr Thomson to Mr Murray. Its dentition differs from that 

 of our common otter, Lutra vulgaris, in having one fewer pre- 

 molar in the upper jaw. Mr Murray had submitted it to 

 Professor Owen, who believes it to be nondescript, and that it 

 approaches Enhydra of Fleming (Phil, of Zool.) in having the 

 first pre-molar suppressed above, but that the latter has also 

 the first pre-molar suppressed below. It has, however, six in- 

 cisors in the under jaw, while the sea otter, Enhydra, has only 

 four in the adult state, which the specimen in question has. 



It would appear to form an intermediate link between the 

 true otter and the sea otter ; and its habitat in an estuary 

 may therefore perhaps be thought suitable enough ; and it was 

 in reference to this that Mr Murray proposed the above generic 

 name for it — Anahyster (belonging to an estuary). 



Phacochceriis 9 (sp. 



Dr Cleland has received a young individual of this genus ; 

 there does not appear to be any essential difference between 

 it and the Cape of Good Hope and Mozambique species, Ph. 

 JEthiopicus. But the individual is too young to allow an 

 opinion to be given with confidence. 



Hipp op o tamus amphibius. — Lin . 



From the information received from the missionaries, there 

 is good reason to believe that the hippopotamus is found in 

 the Old Calabar River further up than the mission stations ; 

 but no specimens, or portions of specimens, have yet been 

 sent home. It may be a question whether there are more 

 than one species of hippopotamus. It is generally supposed 

 there is only one, but it has been found in rivers so widely, 

 and apparently impassably, separated, that it would be noways 

 surprising if more than one species shall yet be determined. 



Manatus Senegalensis. — Desmar. 



Several skulls of this most interesting animal have now 

 found their way into this country from our Old Calabar friends. 



