CHAP. IX.] 



TEETH : DASYURID^E. 



255 



close to the large incisor. In two cases (C. M., 15 17 and h, prob. both Australian) 

 there are two intermediate teeth, one near the incisor, the other near ^. 



379. Pseudochirus. Of various species 2!) skulls shew no numerical variation in 

 upper series. The number of "intermediate" teeth in lower jaw is very variable, 

 '2 on each side being the most frequent, but 1 and 3 being also common. P. pere- 

 grinus, Upper Hunter K., B. M., 41, 1182, has 2 intermediate teeth in left lower 

 jaw, but on the right side one partially double intermediate tooth. (See also No. 371.) 



Petaurus : 25 skulls shew no numerical variation in upper series. 

 In this genus the number of small teeth in the lower jaw is remarkably 

 constant. In addition to ^ there were 3 small teeth on each side in 



380. all cases seen except two, viz. P. breviceps var. papuanus (8 

 normals): right side normal; left lower jaw has 4 teeth besides J7 4 (Fig. 

 66). B. M., 77. 7. 18. 19. 



Right 



Lyt 



FIG. 66. Petaurus breviceps, No. 380. Lower jaws in profile: on right side 

 three intermediate teeth, on left side four. 



381. Another specimen has, in addition to p*,four small teeth in each 

 lower jaw. There is a small diastema between the 3rd and 4th. B. M., 

 42. 5. 26. 1. [no skull]. 



382. Dactylopsila trivirgata : 3 specimens have upper series normal. 

 In addition one has an extra tooth in left upper jaw between F 1 and 

 canine. This tooth somewhat resembles but is rather smaller than the 

 canine, near and slightly internal to which it stands [? reduplicated 

 canine]. B. M., 1197, d. 



(3) Premolars and molars of Dasyuridse and Didelphyidse. 



Thylacinus, 19 normals; Sarcophilus, 9 normals, no abnormal 

 known to me. 



Dasyurus, 37 normals (4 species). 



383. D. geoffroyi : specimen in which p 4 in right lower jaw has its 

 crown partially divided into two, the plane of division being at right 

 angles to the jaw. C. M., 39, . 



