62 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. ']2 



Surv., No. 1/9, 1902. Incorrectly formed names which cannot 

 be accepted as finally settled are, in the present treatise, marked 

 with " 



"(P. 13.) The backbones of the Egyptian " Zeuglodon" osiris 

 with its short vertebrae (especially Stromer, Beitr. Palaontol. u. Geol. 

 Oesterreich-Ungarns, etc., vol. 21, 1908, pi. 4, fig. i), and those of 

 the American Z. cetoides with its long vertebrae (especially Gidley, 

 Proc. U. S. Nat. Mus., vol. 44, 1913, p. 81) differ to such a degree 

 that according to ordinary standards the placing of these animals in 

 the same genus, as has hitherto been done, is certainly out of the 

 question. Z. cetoides is the type of the genus Zeuglodon. By acci- 

 dent no special name has been proposed that can with full right be 

 used for the genus to which " Zeuglodon " osiris belongs. But the 

 name Prozeuglodon seems to have become vacant and may therefore 

 with some propriety be used. It was proposed by Andrews (espe- 

 cially Tert. Vertebr. of the Fayum, Egypt, 1906) for a lot of Eocene 

 cetacean remains from Egypt which he united under the name 

 P. atrox. But according to Stromer, the type of the species, a skull, 

 and some of the other remains belong to the previously described 

 Zeuglodon isis, which is probably correctly called Zeuglodon, while 

 still others are referable to " Z." osiris. In a way therefore " Z." 

 osiris has also been called Prozeuglodon. Possibly the name Doryo- 

 don {" Dorudon") might be used for the genus in question with 

 short vertebrae, or, if there are several genera with short vertebrae, for 

 one of them (see, among others, Leidy, Journ. Acad. Nat. Sci. 

 Philadelphia, ser. 2, vol. 7, 1869, pp. 428, 431, and Lucas, Proc. U. S. 

 Nat. Mus., vol. 23, 1900, p. 331). But Doryodon is still not suffi- 

 ciently known, not even after True (Bull. Mus. Comp. Zool., vol. 52, 

 1908, pp. 65-78, pis. 1-3) has examined the fragments on which 

 Gibbes founded the genus ; the remains in question are altogether 

 too incomplete. For the American '''' Zeuglodon hrachyspondylus 

 minor " Joh. Miiller and Stromer, also with short vertebrae, which 

 True compares with Doryodon and finds different, True (/. c.) pro- 

 poses to erect a new genus, Zygorhisa; but the relationship between 

 it and " Zeuglodon " osiris is not at all clear. 



" (P. 15.) The pelvis and femur of Zeuglodon cetoides are 

 described and figured by Lucas (Proc. U. S. Nat. Mus., vol. 23, 1900, 

 pp. 327-331, pis. 5-7). Both right and left innominates were found 

 associated with a backbone lying in the position relative to the 

 vertebrae in which one would expect to find them. In spite of this 

 circumstance Abel explained the bones in question as the coracoid of 



