MAMMALIA. 713 



Single tuberculate tooth on each side in both jaws. Feet pentadac- 

 tylous, often plantigrade; claws not retractile. Snout abbreviate, 

 rounded ; cranium elongate, protracted behind the jaws. (Condyle 

 of lower jaw cylindric, transverse, strictly inclosed in the gleno'id 

 cavity by exsert lines. Coecum absent.) 



The head of these animals is round forwards like that of the cats, 

 but the distance from between the orbits to the great occipital fora- 

 men is remarkable, so that the skull has a much elongated form at 

 the back part. 



Lutra BAY, STORR, ILLIG. (Spec, of Mustela L.) Molar teeth 



K 



-= - , upper laniary tooth very large, with large accessory tubercle 

 o o 



internally, the lower tuberculate posteriorly. Ears small, remote. 

 Feet palmate, short. Body elongate. Tail short, round, somewhat 

 depressed towards the tip, flat beneath. (Dent. form. OWEN, 

 ; 3-3 1-1 4-4 1-1 



fca^a' c - r=P p> 3^3' m - 2^2 = 



Enhydra FLEMING 1 , Enhydris LICHTENST. Lower incisor teeth 

 (in adults) four. Ears very small, placed at the sides of head below 

 the eyes. Fore feet short, with toes connate, densely haired, the 

 hair covering the claws ; posterior feet remote from anterior, large, 

 with outer toe longest of all. Tail short. 



Sp. Lutra marina ERXL., DESM., Mustela lutris L., COOK Third Voyage, 

 Adas, PI. 97, SCHBEB. Sauyth. Tab. 128, LICHTENST. Darstettung, Tab. 

 43, 50, KRAUSS 1. 1. Tab. 10, fig. 6. The sea-otter attains a length of 

 more than 3 feet ; the tail is 7 inches long ; the colour of the fur is dark 

 brown or black and shining. This species lives on the islands of the west 

 coast of North America, and was formerly also found upon the islands 

 of the opposite coast of Asia and at Kamschatka. (See on the chase of 

 these animals, amongst others, O. YON KOTZEBUE Reise urn die Welt, in d. 

 J. 1823 1826, IT. s. 2426.) 



In Lutra, as in many other Mustelina, the second incisor of the under 

 jaw, counting on each side from the canine, is placed almost behind the 

 third or middle one. The first two or middlemost in Lutra marina fall out 

 early, and hence those behind them take their place, so that there are then 

 only four incisors in the lower jaw. 



Anatomical particulars of the sea- otter have been also given by HOME 

 Philos. Transact, for 1796, pp. 385 394, PL 8 10. 



Pteronura GRAY, Pterura WIEGM. Tail moderate, surrounded 

 by a lobed cutaneous border. Characters of Lutra. Feet large, 

 palmate, with toes apart. 



Philosophy of Zoology, Edinburgh, 1822, II. p. 187. 



