arr. 16. TWO SQUALODONTS FROM MARYLAND—KELLOGG. Di 
SQUALODON HYPSISPONDYLUS Brandt. 
Squalodon hypsispondylus ? Branpt, J. F., Mém. Acad. Imp. Sci. de St.-Peters- 
bourg, ser. 7, vol. 21, No. 6, p. 42, pl. 5, figs. 9-12, 1874. 
Type specumen.—Species proposed provisionally for a caudal ver- 
tebra in the Museum Francisco-Carolinum at Linz, Austria. 
Type locality—No locality is given by Brandt. Itis possible that 
the vertebra was collected by Ehrlich, and in that case it was prob- 
ably found in the marine sand in the vicinity of Linz, in the valley of 
the Danube River, upper Austria. ¢ Upper Oligocene. 
Subsequent allocation.—Additional material will be necessary before 
this species can be properly compared with other known forms. 
AGRIOCETUS INCERTUS (Brandt). 
Squalodon grateloupi MEYER, H. von, Neues Jahrbuch fiir Mineralogie, Stuttgart, 
p- 189, 1847 (part). 
Squalodon ehrlichii Branovt, J. F., Mém. Acad. Imp. Sci. de St.-Petersbourg, ser. 
7, vol. 20, No. 1, p. 360, pl. 31, fig. 3, 1873. 
Squalodon incertus ? Branpt, J. F., Mém. Acad. Imp. Sci. de St.-Petersbourg, 
ser. 7, vol. 21, No. 6, pp. 39 (footnote), 42,, pl. 5, figs. 1-8, 1874. 
Agriocetus austriacus ABEL, O., Denkschr. Kais. Akad. Wiss. math.-naturw. K1. 
Wien, vol. 90, pp. 188-194, pl. 4, fig. 2; pl. 5, figs.1-2; pl. 7, 1918. 
Type specimen.—Based on a posterior cranial fragment of a cetacean 
skull that was referred to Squalodon ehrlichii by Van Beneden.* <A 
tympanic and a lumbar vertebra are also provisionally assigned to 
this new species. Typein the Museum Francisco-Carolinum at Linz, 
Austria. 
Type locality —Y¥ound in a bed of marine sand in the vicinity of 
Linz, in the valley of the Danube River, upper Austria. Upper 
Aquitanian or Upper Oligocene. 
Subsequent allocation.—Abel™ restricted the application of the name 
incertus to the tympanic and the lumbar vertebra and proposed the 
new genus and species, Agriocetus austriacus, for the skull. Brandt, 
however, based his name Squalodon incertus upon the cranial frag- 
ment described and figured by Van Beneden and only provisionally 
assigned the other skeletal material to the same species. Hence, the 
application of incertus could hardly be shifted from the type skull to 
other included material. According to the accepted rules of nomen- 
clature the validity of the older name incertus was not impaired by 
this process of redefinition and should stand. Agriocetus austriacus 
Abel thus becomes a synonym of Agriocetus incertus (Brandt). Abel 
regards Agriocetus as a near relative of Patriocetus, and as an inter- 
mediate stage in the evolution of the true whalebone whales. 
The characters which were assumed to be peculiar to the tympanic 
and the lumbar vertebra are not sufficiently diagnostic to show what 
89 Van Beneden, P.J., Mém. Acad. Roy. Sci. Belgique, Bruxelles, vol. 35, pp. 72,81, pl. 2, fig. 4, 1865. 
90 Abel, O., Denkschr. Kais. Akad. Wiss, math.-naturw. Kl. Wien, vol. 90, p. 189, 1913. 
