BY C. W. DE VIS. 
Ill 
anteriorly, parallel with outer side and not incurved posteriorly. 
A largely dilated intero-posterior cusp linked to the lobe apically, 
separated from it by a wide cleft posteriorly. Ledge very narrow 
within a broadly tubercular basal rim which extends to the 
anterior fifth. Mesial two-thirds of the outer side impressed, 
with three strong short ribs, decreasing in length rearwards. 
Molars. — (PL xvn. figs. 14-15). Mandibulary, with a narrow 
basal ridge posteriorly; hind lobe of m. 4 distinctly the narrower. 
Examples — -seventy-three. 
Maxillary. — Four adults. 
Mandibular. — Fifty-six adults, thirteen young. 
Halmaturus odin, n.s. 
Lower premolar unilobate, mesially corrugated, expanded but 
not developing a cusp on intero-posterior angle. Molars with an 
accessory process in relief on intero-anterior surface of lobes and 
with basal talons. Lower contour line undulated. 
Dimensions. 
Mandibular. — The full series of cheek-teeth measures 46*7 in 
length (1); the first four 37*0 (1); the first two true molars 18*6 
(1); the last molar 12-4 (1); the premolar from 8-0 to 8-7 (3); 
m. 2 10-8 (1). The width of m. 3 7-6 and 8-1 (2). The anterior 
depth is from 19 2 to 24'1 (3); the posterior from 16*1 to 23*8 
(3); the thickness from 115 to 12-5 (3). 
Form. 
Mandibidar. — P. 4 (PI. xvn. fig. 16) elongate; diameters 8 - 0 x 
4-0, gradually widening from the pointed fore end. Crest central; 
anterior and posterior cusps defined by a mesial compression of 
the crown, which has on each side three distinct and two obscure 
short ribs. Crest curving on to a small but distinct dilatation of 
the crown over the intero-posterior angle. Profile of fore end of 
crown gibbous. 
