ALLEN — FOSSIL CETACEANS FROM FLORIDA 
157 
MEASUREMENTS OF 15787 M.C.Z. 
mm. 
Greatest transverse width across both condyles 144 
Greatest vertical diameter of right condyle 93+ 
Greatest vertical diameter of left condyle 100=t= 
Greatest width of right condyle 57 
Greatest width of left condyle 59 
Distance between right and left condyles above 41 
Distance between right and left condyles below 14 
Foramen magnum, vertical diameter 63=^ 
Foramen magnum, transverse diameter 45 
It is possible that a cetacean vertebra from Brewster figured by Sellards (1915, 
p. 105, fig. 33) belonged to a whale of this same species. 
SUMMARY 
It is evident that the three fossil cetaceans here noticed have much 
in common with species occurring elsewhere in Miocene formations. 
The first, Schizodelphis depressus, is closely allied to a species represented 
in the Miocene of Shiloh, New Jersey, if indeed it is not identical with 
it. The second, Pomatodelphis inaequalis, is referred to a new genus 
that apparently occurs as well in the lower and the middle Miocene 
of France, where, however, it is represented by a less specialized species. 
The implantation of the teeth suggests a possible relationship to Platan- 
ista, though it is considered one of the Iniidse. The third is closely 
related to a cetacean described from the lower Miocene of Patagonia 
and is believed to be identical with a species, Diaphorocetus mediatlan- 
ticiis, discovered in the upper Miocene of Maryland. On the whole, 
therefore, the evidence of the cetacean remains points to a late Miocene 
age for these pebble phosphate’’ deposits of Florida. The two species 
of Iniidse seem to represent the terminal members of a group now ex- 
tinct, though related to the existing river dolphins. The one Physeter- 
oid is a more primitive representative of a group that has survived 
to the present day, but whose living members, perhaps through a 
change from fish-eating to squid-eating habits, have lost the functional 
teeth of the upper jaw. 
LITERATURE 
Abel, 0. 1899. Untersuchungen ueber die fossilen Platanistiden des Wiener 
Beckens. Denkschr. Akad. Wiss. Wien, vol. 68, p. 839-874, pi. 1-4. 
Case, E. C. 1904. Systematic paleontology of the Miocene deposits of Mary- 
land. Mammalia. Md. Geol. Surv., Miocene, p. 3-58, pi. 10-26. 
Cushman, J. A. 1920. The American species of Orthophragmina and Lepido- 
cyclina. Prof. Paper, U. S. Geol. Surv., no. 125-D, p. 39-105, pi. 6-35. 
(See Correlation table facing p. 40.) 
JOUENAL OP MAMMALOGY, VOL. 2 , NO. 3 
