ALLEN — FOSSIL CETACEANS FROM FLORIDA 
151 
the glenoid cavity of the jaw and the cranial condyles. The occipital crests 
arise as sharp ridges from the upper side of the squamosal processes, and meet 
in a transverse ridge at the summit of the skull. Posteriorly the squamosal and 
adjacent surfaces are irregularly pitted or roughened for muscle attachments, 
quite unlike the smooth surfaces in skulls of modern dolphins. The glenoid 
cavity for the articulation of the jaw is relatively small, a primitive feature, 
and that of the right side is the smaller. A broad groove bounds the lower inner 
margin of the articulating surface. 
The specimen affords the following complete measurements: 
mm. 
Extreme width of skull across squamosal processes 199.0 
Width of braincase across bases of same 143.0 
Width across occipital condyles 91.5 
Right condyle, greatest vertical diameter 52.0 
Right condyle, greatest transverse diameter 32.0 
Left condyle, greatest vertical diameter 49.0 
Left condyle, greatest transverse diameter 30.5 
Foramen magnum, greatest vertical diameter 27.0 
Foramen magnum, greatest transverse diameter 40.0 
Lip of foramen magnum to basisphenoid suture 81.0 
Remarks . — In establishing this new genus and species a careful 
review of the literature has been made in order to ascertain if other 
specimens, congeneric with it, have been described. It is obvious that 
species and genera based on other parts of the skeleton than the cranium 
can at present afford no sure points of comparison. There are, how- 
ever, two specimens from the Miocene of Europe, that appear to be 
referable to the new genus. The first of these is a fragment of the 
right maxilla first mentioned and figured by Cuvier (Rech. sur les Oss. 
Foss., 1823, ed. 2, vol. 5, pt. 1, p. 317, pi. 23, fig. 38) as belonging to 
a ^‘dauphin dont une portion de machoire superieure a ete trouvee 
dans le calcaire grossier du departement de FOrne. In the fourth 
edition of the same work (1836) the specimen is said to be from the 
‘‘departement de Maine-et-Loire. Whichever locality may be cor- 
rect, it is fairly certain that the horizon is Miocene, probably middle 
Miocene. The specimen is next referred to by Holl (1829) in a work 
rarely cited, Handbuch der Petrefactenkunde. Here it is listed as 
Delphinus stenorhynchus Cuv.” with brief mention and reference to 
Cuvier’s work. The latter author, however, though having observed 
in his original account, that the species was unlike any other hitherto 
described, gave it no name either in this or in the later editions of the 
Ossemens Fossiles, and apparently quite overlooked or ignored HolFs 
name. Thus Holl, though citing Cuvier as authority, seems to have 
been himself the actual author. Later writers, including Brandt, 
