38 PTILOCERCUS LOWII. 



bad state of conservation so I prepared the skeleton of it. 



The locality - Sumatra - is new for this species. 



The skeleton presents 1 4 cpstales , 5 lumbares , 3 sacra- 



les and 31 caudales. The ribbs are peculiarly broad. The 



clavicle is well developed; the bones of the forearms and 



of the hind legs are separate. The form of skull and teeth 



has been described by Gray in a few words. I add the 



following remarks. Bony palate like in Tupaja- and Gymnura- 



, , , . , . 2—2 1 — 1 3—3 3—3 



species ; dental lormula : i. - — - c. - — - p m. - — —ni. - — - 



o — 6 1 — 1 3 — 3 3 — 3' 



Upper jaio : incisors with an interior basal cusp ; the ca- 

 nine is sized and shaped like the two anterior premolars , 

 incisors separated by a wide space, a similar interval sepa- 

 rates the hindmost incisor from the canine ; the canine , 

 premolars and molars closely crowded. 



Lower jaw: the first pair of incisors much shorter and 

 smaller than the second incisors ; the third incisor not 

 half as high as the second one ; the canine exceeds in 

 highth the two first premolars , of which the anterior is 

 the most developed one; third premolar exceeds the molars 

 in vertical extent; all the teeth closely crowded, with 

 exception of the first and second incisors, which are 

 separated by a very narrow interval. 



Notes from the Leyden Museum, Vol. "VII. 



