JMAMMALIA. 697 



the three middle toes. Body elongate, clothed with appressed hair, 

 smooth, attenuate backwards, terminated by a very short, conical 

 tail. 



Phalanx I. Upper canine teeth large, exsert, destitute of root. 



Triclieclius L. (excl. of Trichechus Manatus). Incisor teeth 

 deciduous, except an upper one on each side, resembling a molar; 

 molars with crown flat, depressed, oblique. Muzzle covered, tumid 

 forwards. Ears none. Four ventral mammge. 



Sp. Trichechus Rosmarus L., F. Martens Spitzhergische Reisebeschr. Ham- 

 burg, 1675, 4to; pp. 78 — 83, Tab. P, fig. i, Cook's Voycujcs, &c. Atlas 

 fol. PI. 52, Blumenb. Ahh. naturh. Gegenst. No. 15 1, Cuv. R. Ani., ed. 

 ill., Mammif. PI. 45 ; the skeleton is figured in Pander und D'Alton 

 Die Skelete der Robhen u. Lamcntine {Vergl. Osteologie, Liefer, ix.) Tab. i. 

 Comp. K. E. Von Baer Anatomische u. zoologische Untersuchungen iiher 

 das Walross {^Trichechus rosmarus) und Vergleichung dieses Thiers mit 

 andern See-Sdugthiere, Mem. de I'Acad. Jmper. des Sc. de St Petershourg, 

 Ylieme Serie, Sc. math, physiques et naturelles, Tom. iv. 1838, pp. 95 — 235. 

 The Walrus {le morse, — mors or morsz is a Russian word for this animal). 

 It is from 10 to 12 feet long ; it is said that it sometimes attains a length 

 of 20 feet. The walruses live together in troops in the sea towards the 

 North Pole, especially at Spitzbergen and Nova Zembla and in Behring's 

 Straits ; they sleep on the drifts of ice, whilst some keep guai'd, and when 

 danger threatens awake the others by bellowing. The mothers defend 

 their young and carry them off when wounded. 



We have not given the number of teeth on account of the great 

 difference to which it is subject from the period of life. Comp. H. 

 Kersten Capitis Trichechi Rosmari descriptio osteologica. Cum Tab. 2, 

 Berolini, 1821, (from the investigations of Rudolphi), Wiegmann Ueier 

 das Gebiss des Walrosses, Archiv f. Naturgcsch. 1838, s. 390 — 413. 

 G. Jaeger ibid. 1844, s. 70—75. According to Rapp and Wiegmann 



there are originally -p incisors, canines, molars, but the posterior 



molar and all the incisors soon fall out ; the tooth which is usually 

 regarded as the first molar is, according to Rapp, the lower canine. The 

 large superior canines, which are 15 or more inches long, and of which each 

 weighs sometimes 10 pounds, are in some individuals with the points bent 



1 This figure of Blumenbach is a copy after the same original from which that of 

 De Laet Novus Orbis, L. B. 1663, p. 38, was also taken, viz. a specimen brought alive 

 to Holland in 161 2, and which was described by A. E. Vorstius, Professor at 

 Leyden. 



