6 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 82 



Boca del Infierno. — Humerus, i. 



San Gabriel (owl deposit). — Lower incisor, i ; humeri, 3. 



San Gabriel (cvilture deposit). — Mandible, i. 



Naranjo Abajo. — Right side of palate with pm* and m^ in place, i ; 

 mandibles, 3. 



Anadel. — Mandibles, 14. 



Rio San Juan. — Right side of palate with all four teeth in place, i ; 

 fragment of premaxilla with incisor in place, 2; mandibles, 43. 



Kilometer 2 site. — Right premaxilla and anterior portion of palate 

 with pm* in place, i ; palate with all the alveoli and pm* left and pm* 

 and m^ right in place, i. Left side of palate with alveoli of all four 

 teeth, I ; mandibles, 61. 



Kilometer 4 site. — Mandibles, 16. 



The frequency with which the bones of this animal occur in the 

 Indian deposits indicates that Brotomys must have been abundant 

 and generally distributed in pre-Columbian days. It was probably 

 much like the living South American spiny-rats in size and general 

 form, but with heavier, less elongated head. I have little doubt that 

 this animal was the mohuy described by Oviedo as the most eagerly 

 sought for of the native edible quadrupeds (see p. 13). 



This material agrees in all essential features with the original 

 specimens from San Pedro de Macoris and with those that have been 

 collected in the Haitian cave deposits. Except for individual pecu- 

 liarities that appear to be due to age the jaws are very constant in all 

 their characters. I can detect no differences between those collected 

 in the humid Samana Bay region and those from the semiarid country 

 near Monte Cristi. 



In one jaw from Kilometer 2 site, the premolar is in a stage of wear 

 to show that the small enamel " lake " usually present in the anterior 

 lobe of the crown is the remnant of a reentrant fold penetrating from 

 the outer side of the tooth.' In two others from Rio San Juan, the lake 

 has been joined to the tip of the anterior inner reentrant fold, while 

 in one specimen from the same locality, the crown, though not exces- 

 sively worn, shows no trace of the anterior " lake," its pattern thus 

 resembling that of the molars. 



ISOLOBODON PORTORICENSIS Allen 



Plate I, fig. 6 



Railroad cave. — Imperfect skulls, 4; left half of rostrum, i ; right 

 premaxillary with incisor, i. Left half of palate, without teeth, i; 

 right half of palate, m^ in place, i ; mandibles, 20. 



^ An even better specimen in the same stage was collected by Arthur J. Poole 

 in the small cave near St. Michel, Haiti. 



