34 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL. 62. 
SQUALODON TIEDEMANI Allen. 
Squalodon tiedemani ALLEN, J. A., Bull. Amer, Mus. Nat. Hist., vol. 2, art. 2, pp. 
35-39, pls. 5-6, 1887. 
Type specimen.—Consists of the rostral portion of the skull, 50 cm. 
in length, with 12 teeth in place and 2 vacant alveolae. Type, No. 
10445, department of geology, American Museum of Natural His- 
tory, New York. 
Type locality—Specimen was obtained “in dredging phosphatic 
material from the Wando River, at Charleston, this material occur- 
ring in detached fragments in the mud of the river bottom; it was 
thus presumably an erratic from the phosphate beds of the neigh- 
boring region,’ South Carolina. ? Edisto marl or Upper Miocene. 
Subsequent allocation.—Allen remarks” that this rostral fragment 
indicates a species of much larger size than Squalodon holmesi, ‘and 
on this account perhaps might be provisionally referred to Squalodon 
atlanticus.”’ The crowns of the premolars of this specimen are im- 
perfectly preserved, and the characters exhibited by the cutting edges 
of these teeth are thus unknown. Considerable uncertainty exists as 
to whether or not Squalodon tiedemani should be placed nearest the 
squalodonts or the zeuglodonts. The teeth of this form may suggest 
relationship with either group, but in the point of size it is much larger 
than any previously described squalodont. A careful comparison of 
the types of Squalodon atlanticus and Squalodon tiedemani has failed 
to convince the writer that these two cetaceans are closely related to 
one another. 
RHYTISODON TUBERCULATUS Costa. 
Rhytisodon tuberculatus Costa, O. G., Atti dell’Accad. Pontaniana, Naples, vol. 
7, pt. 1, fasc. 1, pp. 83-84, pl. 6, figs. 16a, 6, 17, 18, 1853 [an earlier reference is 
quoted, namely, Costa, O. G., Cenni sulle scoperte paleontologiche fatte nel 
Regno durante l’anno 1851, Naples, pp. 10, 11, 1852].—CaprELuini, G., Mémorie ~ 
della Accad. delle Sci. dell’Istituto di Bologna, ser. 3, vol. 9, fase. 2, pp. 
242-243, pl. 2, fig. 4, 1878. 
Type specimen.—Original description was based upon one rugose 
molar tooth, consisting of a nearly perfect crown, but with the base 
of only one root present, the other having been broken off below the 
crown. Type, No. 4527, collection of the ‘“‘ Museo geologico della R. 
Université di Napoli,”’ Italy. 
Type locality —T ype tooth came from the “ calcare leccese, a mezzo 
miglio allo incirca dalla Cittaé, verso l’owest, ed alla profondita di 
palmi 34.” Environs of Lecce, Compartment of Apulia, Italy. 
Langhiano or Lower Miocene. 
Subsequent allocation.—It was not until 1864 that Costa * under- 
stood the true relationships of this tooth and placed it near Sqgualodon. 
S2 Allen, J. A., Bull, Amer. Mus, Nat. Hist., vol. 2, art. 2, pp. 38-39, 1887. 
88Costa, O. G., Atti dell’Accad. Pontaniana, Naples, vol. 8, Appendice, p. 85, 1864. 
