386 General Notes. [ April, 
into a very small cusp or tubercle, which is not of sufficient size to 
truncate the internal outline of the crown. e crown of the 
second true inferior molar displays a contracted triangle of three 
well developed cusps anteriorly, and a wide basin posteriorly. 
The rim of this basin is elevated all round and develops into a 
cusp on the external side. An external, no internal cingulum. 
Enamel longitudinally wrinkled. 
Measurements: Length of three true molars .0185 ; diameters 
of M. 11, anteroposterior .0075, transverse .0075; do. of second 
inferior true molar, anteroposterior .0075, transverse posteriorly 
.006. As the fourth inferior premolar of this species is unknown, 
its reference to the genera Chriacus is provisional only. It is 
dedicated to my friend, Professor Alpheus Hyatt, of Boston, 
S: 
Mixodectes ? sp.—Two rami with true molars. 
Loxolophus adapinus, gen. et sp. nov.— Char. gen.—Known only 
from inferior molars. Crowns with three cusps anteriorly and a 
basin posteriorly. The internal and external anterior so con- 
nected as to form a transverse crest on a little wear; anterior or 
fifth cusp distinct. Rim of basin elevated on the external side 
and extending as a crest to the base of the anterior cusps. Inter- 
nal rim acute, and so near the external as to resemble a large 
cingulum. Third true molar with a small heel. The position of 
this genus cannot be determined without further material. The 
oblique direction of the crests resembles what is seen in the 
genus Adapis Cuv. 
Char. specif.—The posterior rim only rises into a cusp at the pos- 
terior external angle. There are no cingula. The enamel is 
slightly wrinkled longitudinally. The posterior molar is consid- 
erably smaller than the first, which is a little smaller than the 
second. The last molar rises obliquely with the anterior base 
of the coronoid process, The anterior masseteric ridge is quite 
predominant, but the fossa is not distinctly bounded below. 
Measurements ; Length of true molars .o1g; of last molar 
.006 ; width of do. .003; length of second true molar .007 ; width 
