NO. 5 MAMMALS FROM DOMINICAN REPUBLIC MILLER "J 



Boca del Inficrno. — Imperfect palate with left m- in place, i ; 

 mandibles, 7. 



San Gabriel (culture deposit). — Palate, i; fragment of left pre- 

 maxilla with incisor, i ; mandibles, 3. 



Naranjo Aba jo. — Palate with right m- in place, i ; upper molar of 

 a larger individual, i ; mandibles, 3. 



Anadel. — Palate with all teeth, i ; fragments of rostrum with in- 

 cisor, 5 ; occipitals, i ; mandibles, 41. Numerous odd teeth. 



Rio San Juan. — Broken skull, i ; complete palate with all teeth, i ; 

 palate lacking left m^, i ; fragments of palate, 9 ; fragments of rostrum 

 with incisor, 10; mandibles, 184. 



Kilometer 2 site. — Imperfect skull, i ; fragments of palate, 3 ; 

 mandibles, 10. 



ISOLOBODON LEVIR (Miller) 



Plate I, fig. 5 



San Gabriel (owl deposit). — Imperfect skulls, 2; palate with right 

 molars in place, i ; separate maxillary teeth, 2; mandibles, 13. 



Kilometer 2 site. — Palates and fragments, 21 ; mandibles, 281. 



These specimens agree with the original series from caves near St. 

 Michel, Haiti, and dififer obviously from the remains of Isolobodon 

 portoricensis recovered from the kitchenmiddens in the Samana region. 

 Among 15 jaws selected for large size, the length of mandible from 

 articular process ranges from 44.6 to 48 mm., height of ascending 

 ramus through articular process from 20.6 tO' 23 mm., and alveolar 

 length of toothrow from 16 to 17.6 mm. In 11 jaws of /. portoricensis 

 from the San Juan River, also selected for large size, the extremes 

 of the same measurements are respectively 50 to 52.6 mm., 24 to 

 26.6 mm. and 19 to 20.8 mm. 



After examining the entire series of Santo Domingan Isolobodon 

 remains I am still as unable to distinguish the large form from the 

 Porto Rican /. portoricensis as I was in 1918 on the basis of the very 

 few specimens then collected. It seems improbable that such a 

 distribution could exist without human intervention. No other species 

 of rodent has been found to be common to the two islands and 

 no species could be expected to remain constant in two areas that 

 have been separated as long as these two land masses. Finally, 

 Porto Rico and the eastern part of the Dominican Republic, together 

 with the Virgin Islands, where the same large Isolobodon also occurred, 

 are in a region known to have been freely traded over by pre- 

 Columbian man in his sea-going canoes. It must be admitted, however, 

 that the hypothesis of human transportation meets with a difficulty 



