FLORIDA Ml'SKRAT. 



329 



Measurements of Ntofiber Alleni, from tie ti/]>ical alcoholic tptcinun from Georgiana, I'la. 



Ccntiiu. i. n. 



Length of head and body 20. 2 



Length of head 5.2 



Length of tail 12. G 



Length of hind foot (without claws) \\. <> 



Length of fore foot (without claws) 2.3 



Nose to eye 2.0 



Nose to base of ear 4.5 



Height of ear 1.8 



Length of middle toe of fore foot (without claw) 9 



Length of middle toe of hind foot (without claw) 1.0 



Longest claw of fore foot 5 



Longest claw of hind foot 6 



Measurement* of the skull. 



Total length 4.7 



Greatest width 2.9 



Length of nasals 1.2 



Length of tooth-row 1.1 



Front edge of first molar to posterior margin of incisors 1.6 



Greatest width of muzzle 7 



Width of iuterorbital bridge. 5 



Center of occipital crest to line of hinder margin of orbits 1.9 



Measurements of the skeleton. 



Total length (along curves) 32.8 



Anterior margin atlas to extremity of post-zygapophysis of last sacral vertebra. 12. 9 



Extremity of post-zygapophysis of last sacral vertebra to end of tail 15. 2 



Length of 7 cervical vertebrae 1.0 



Length of 13 dorsal vertebrae 5 



Length of 6 lumbar vertebrae 3 



Length of 4 sacral vertebrae 2. 7 



Length of 25 caudal vertebrae 15. 2 



Length of scapula (glenoid fossa to superior margin) 2. 4 



Length of sternum (without ensiform cartilage) 3.2 



Length of humerus 2. G 



Length of ulna 3. 3 



Length of mauus 2. 1 



Length of pelvis 4. 5 



Length of femur 3.3 



Length of tibia 3.8 



Length of pes 4.2 



The characters which have been employed to separate Arvicola and 

 Fiber relate to the feet, the tail, and the posterior lower molar. They 

 may be contrasted thus : 



Arvicola. 



Tail terete. 



Hind feet uot specially modified for 

 aquatic progression. 



Posterior lower molar with three cusps; 

 tin- re-entrant angles opposite. 



Fiber. 



Tail compressed. 



Hind feet greatly modified. 



Posterior lower molar with four or five 

 cusps; the re-entrant angles alternate. 



