NO. 9 MAMMALS FROM CAVES IN HAITI MII.LKR 23 



Remarks. — The genus Quemisia is a member of the group which is 

 represented by Elasmodontoinys in Porto Rico and Ainhlyrhisa in 

 Anguilla. The cheekteeth in all three of these genera are very hypso- 

 dont but not ever-growing. The enamel pattern is pentamerous with 

 the inner reentrant fold of the upper teeth (in Amblyrhisa and 

 Elasmodontoinys, at least) and the outer fold of the lower teeth 

 passing behind the posterior outer reentrant. All of the reentrant 

 folds penetrate nearly or quite across to the opposite side of the crown, 

 thus producing a grinding surface which consists of a series of essen- 

 tially parallel transverse enamel ridges. 



The most striking known peculiarities of Quemisia are the long 

 mandibular symphysis, short lower incisor, and the very unusual for- 

 wardly-directed enamel folds in the lower teeth. I have chosen the 

 name because of my belief that the animal is probably the " Quemi " 

 of Oviedo (Hist. Gen. et Nat. de las Indias, Madrid, 1851, p. 389). 



QUEMISIA GRAVIS sp. nov. 

 Plate 4, figs. 2, 2a 



Type. — Mandible of immature individual ( m-, with crown not yet 

 in place). No. 253175. U. S. Nat. Mus. Collected in the crooked cave 

 near the Atalaye plantation, March, 1925, by Gerrit S. Miller, Jr. 



Characters. — As compared with a mandible of Elasmodontomys 

 obliquus in corresponding stage of tooth growth the type specimen 

 of Quemisia gravis shows many peculiarities in addition to those which 

 have already been described. The depth of the horizontal ramus at 

 middle of m^ is greater in proportion to the length of the toothrow 

 (21.5:33 instead of 18:34); the maximum width through the 

 symphysis is greater (17.5 instead of ii ) a difference occasioned partly 

 but not wholly by the more posterior point of termination of the 

 symphysis in the Haitian animal. The anterior base of the angular 

 process is laterally compressed in Quemisia, so that it forms about 

 one-third of the transverse diameter of the mandible; in Elasmodon- 

 tomys it is so thick that it forms considerably more than half of the 

 entire transverse diameter. The roots of the third and fourth cheek- 

 teeth extend down into this thickened area in Elasmodontomys. In 

 Quemisia the roots of the three molars form a broadly curved ridge 

 extending backward and upward from the symphysis and separated 

 from the base of the angular process by a shallow groove; this ridge 

 has, at first sight, something the appearance of the ridge which marks 

 the course of the incisor root in Elasmodontomys. 



