80 MTJSTELID.S;. 



5. Gtmnoptts. False grinders |. Head elongate, narrow. Feet 



rather naked, bald beneath, between, and rather behind 

 the pads ; toes largely webbed. Soles hairy behind. Body 

 slender. 



B. Subplantigrade. Soles and between the pads hairy. Body stout. 



Tail short, bushy. Anal glands none. False grinders f . 



6. GuLO. Tubercular grinder oblong, transverse ; flesh-tooth elon- 



gate, with a small subanterior inner lobe. 



C. PlantigTade. Soles of hind feet bald, callous. Body elongate. Anal 



glands distinct. False grinders f ; tubercular grinder oblong, 

 transverse. 



7. Galera. Tail elongate. Soles of hind feet with a central 



longitudinal depression behind, and obscurely divided into 

 four large pads in front. Heels hairy. 



8. Geisonia. Tail short. Body slender.' 



Tribe 2. Lutrina. Head depressed. Feet normal, rounded ; toes 

 webbed. Tail thick, tapering, depressed. Tubercular grinder 

 oblong, transverse. 



A. Tail conical, tapering, entirely covered tvith hair. 

 t The palms and soles of the feet bald between the pads. 

 * The muzzle hairy ; otdy the thin margin of the nostrils bald. 

 9. Baeangia. Claws rudimentary, blunt. Toes rather elongate. 



** The muzzle hairy between the nostrils; upi)er and front edge 

 of the nostrils bald. 



10. LoNTRA. Toes rather elongate, well webbed ; claws sharp. 



*** The muzzle bald, hand-like between the front and ujiper edge 

 of the nostrils. 



X Foot oblong ; toes thick, loebbed to the claws, sharply clcnoed ; 

 jnids of toes and palm large, close together. 



11. LuTEA. Orbit of skull defined by a conical pj'ocess behind. 



Head and skull elongate. 



12. Nutria. Orbit of skuU defined by a conical process behind. 



Head and skull short, broad. 



13. LuTEONECTES. Orbit of skull scarcely defined behind. Claws 



acute, strong. Head and skull elongate. 



\ \ Foot oblong ; toes rather slender, free at the etid, bluntly or imper- 

 fectly clawed ; pad of palm large, of toes slender, sejxirated. 



14. AoNYX. Orbit defined behind. Skull broad, depressed. 



