542 PHrLLOSTOMID^. 



Upper middle incisors moderately large, unieuspidate, triangular ; 

 outer incisors very small, flat-crowned (Plate XXX. fig. 5 6) ; lower 

 incisors equal, close together, their longest diameter at right 

 angles to the direction of the jaws, their cutting-edges unnotched ; 

 upper canine with a prominent posterior basal projection ; first upper 

 premolar very small, but slightly larger than one of the outer upper 

 incisors, the second equals three fourths the canine ; molars very 

 broad, with concave crowns and prominent notched outer and inner 

 cutting-edges ; the central molars largest, the last upper and lower 

 molars but slightly smaller than the first. 



The CBsophagus is very narrow, and enters the stomach close to 

 the pyloric extremity ; the cardiac portion of the stomach is ex- 

 panded upwards and to the left side ; the pyloric muscular con- 

 striction is not well defined ; the intestine measures about 20 inches 

 in length. 



Length, head and body 3""3, head l"-3, ear 0"-8 x 0"-5, tragus 

 0"-35, nose-leaf 0"-2x0"-25, forearm 2"-5, thumb 0"-65; third 

 finger— metacarp. 2"-l, 1st ph. 0"-65, 2nd ph. 0"-9, 3rd ph. 0"-7 ; 

 fourth finger— metacarp. l"-95, Ist ph. 0"-6, 2nd ph. 0"-85 ; fifth 

 finger— metacarp. 2"-l, 1st ph. 0"-55, 2nd ph. 0"-6 ; tibia 1", 

 foot 0"-75. 



Hah. West Indies (Cuba ; St. Vincent's). 



a. S ad., al. (type). Cuba. W. S. MacLeay, Esq. [P.] 



h. c3' ad., al. St. Vincent's. 



c. 5 ad., si. West Indies. 



31. CENTUEIO. 



Centurio, Gray, Annals Sf Mag. Nat. Hist. x. p. 259 (1842). 



Muzzle even shorter and broader than in Ametrida, the crown of 

 the head much raised above the face-line ; face naked ; no distinct 

 nose-leaf, but the nostrils open in a concavity at the extremity of 

 the muzzle, bounded by raised cutaneous edges ; upper lip divided 

 in the centre, the reflected margins continuous above with the sides 

 of the concavity, in which the nostrils open ; ear-conch deeply di- 

 vided internally ; under surface of the lower jaw and throat with 

 transverse cutaneous bands. 



Dentition. Inc. |, c. ^, pm. |^, m. |^. 



Teeth as in Ametrida, the last upper molar but slightly smaller 

 than the first. 



According to the form of the skull and teeth, this genus is most 

 closely related to Ametrida and Stenoderma, and the white shoulder- 

 spots further indicate its afiinity to these genera. The absence, 

 however, of a distinct nose-leaf, the very peculiar form of the face, 

 the presence of gular bands and pouches, and the structure of the 

 vring-membrane, render the genus so distinct from all others, that 

 it is probably more properly placed at the end of the group. 



