NO. 9 MAMMAI,S FROM CAVES IN HAITI MILLER 21 



the extinct animal will permit, are as follows : palate in region between 

 pni* and maxillo-premaxillary suture much smaller relatively to grind- 

 ing area of toothrow ( about 10x14 mm. as compared with 13x18 mm. 

 in a specimen of C. piloridcs with grinding area of toothrow of essen- 

 tially the same length and breadth as that of the type), its upward 

 slope more abrupt ; no obvious pit for attachment of the maxillo-naso- 

 labialis muscle in region between puii and incisive foramen (these 

 pits are visible in all the living species of Capromys and Geocapromys; 

 they are not developed in Isolohodon, Aphcctreus or Flagiodontia) ; 

 posterior emargination of palate extending forward slightly beyond 

 level of posterior border of in- instead of about to middle of m^ ; 

 narrow inferior maxillary zygomatic root, its width through middle 

 of specialized muscle-insertion area considerably less than width of 

 grinding surface of molars instead of distinctly greater than width of 

 this surface. The upper toothrows are more convergent than in 

 Capromys piloridcs, so that the bony palate becomes reduced anteriorly 

 to a width only about one-fifth that of the adjoining alveolus or of its 

 own width posteriorly. In C. piloridcs the anterior width of palate is 

 considerably more than half that of alveolus and almost exactly half 

 of its own posterior width. Posterior emargination of palate extend- 

 ing slightly beyond level of septum between alveoli of m^ and ur. All 

 of the mandibles are broken immediately behind the toothrows. In 

 the portion which remains there are several obvious peculiarities as 

 compared with the corresponding region in Capromys piloridcs. The 

 diastema is short and more abruptly concave when viewed from the 

 side. The symphysis is conspicuously shorter than in C. piloridcs and 

 its long axis is set at a higher angle to the plane of the grinding 

 surface of the molars ; about 50° instead of about 35°. The anterior 

 portion of the ridge which extends forward along the outer side of the 

 mandible from the angular process is heavier and more evenly rounded 

 than in the Cuban animal. The enamel pattern of the mandibular teeth 

 appears to be not positively distinguishable from that of Capromys 

 piloridcs. 



Measurements. — Type : distance from posterior surface of m^ to 

 anterior border of maxillary directly in front of toothrow, 30.0 

 (35.0) ; ^ distance from posterior margin of incisive foramen to poste- 

 rior margin of palate, 24.6 (26.2) ; distance from alveolus of pm* to 

 anterior edge of maxillary, 9.4 (13.2) ; width of bony palate through 



^ Measurements in parenthesis are those of a similarly broken palate of a 

 slightly older individual of Capromys pUorldes from Sierra La Guira, Pinar del 

 Rio, Cuba (No. 253232, U. S. Nat. Mus.). 



