The Proboscidia. 
205 
simple in construction, and resemble those of the D. cordille- 
rannn Desm., but the species has a short, elephant-like 
symphysis. 
The Tetrabelodon serridens Cope was founded on a first or 
llf 
specimen I 
/^TKjCope; 
second true molar from Texas. It is peculiar among Ameri- 
can species in its acute elevated, entire crests, with tuber- 
culo-serrate edges. It thus resembles the M. turicensis. but 
differs in well-developed longitudinal crests at the inner end 
of the external half of the crests, which consist of two tuber- 
cles on the posterior side of a crest, and one on the anterior 
side of the next succeeding crest. Strong anterior and pos- 
terior cingula ; edge of each cross-crest with six or seven 
tubercles. Length of crown, M. .130; width, .080 ; elevation, 
061 Length of J/. izwrr/c^;«^.y, but narrower. Remains of a 
large Tetrabelodon from Florida have been described by 
Leidy under the name of T. floridamis. Its molars present 
