NO. 8 INTERRELATIONSHIPS OF THE CETACEA WINCE 8l 



maxillary, and a slightly projecting intermaxillary, may also be found 

 in Stcno, DclpJiinus, and several other of the recent Delphinidcc. 

 (3) There is no evidence that cetaceans are descended from mammals 

 with bony armor ; the so-called dermal bones that were found on rare 

 occasions with remains of Zeuglodon and DclpJiinopsis are too doubt- 

 ful to prove anything; in the great majority of instances no dermal 

 armor has been found with bones of Zeuglodon and other Archceoceti. 

 The " dermal armor," that is, the small spots of more or less tubercu- 

 late, mosaic-like skin, in Neomeris and PJwccena is assuredly a new 

 development. (See pp. 56-58.) (4) It cannot be correctly said that 

 the nostrils in Phocccna and Neomeris lie relatively far forward. It 

 appears so merely because the anterior part of the face is somewhat 

 shortened and the braincase is unusually large. In reality the nostrils 

 lie, with respect to the orbits and other surrounding parts, in the same 

 position as in most Delphinids. Neither can it be said that the 

 parietals are excluded from the upper side of the braincase to a less 

 degree than usual. As may be seen in the young skulls the parietals in 

 PhoccBna are widely separated by the large interposed interparietal 

 quite as usual in other Delphinids. 



^ (P. 35.) On the Delphinidse see especially: 

 Cuvier : Recherches sur les Ossemens f ossiles, ed. 4, vol. 8, pt. 2. 

 1836, pp. 75-170, Atlas, pis. 222-224, with figures of skull and 

 some other skeletal parts, of most of the recent genera. 

 Schlegel : Beitrage zur Charakteristik der Cetaceen ; Abhandlungen 

 aus dem Gebiete der Zoologie und vergl. Anatomic, Heft, i, 1841, 

 pp. 1-44, pis. 1-6. Contains among other things a synopsis of the 

 Delphinids, with figures of skulls of Steno, Prodclphinus, Dcl- 

 phinus, Lagcnorhynchus, all under the name Delphinus. 

 J. E. Gray: The Zoology of the Voyage of H. M. S. Erebus and 

 Terror, pts. 3-5, Mammalia, On the Cetaceous Animals, 1846, 

 pp. 13-53, P^s. 1-30. Most of the plates give figures of skulls 

 of Delphinids: Delphinapterus {"Beluga"), " Feresa" {Orca 

 intermedia) , Orca, Lagcnorhynchus, Tursiops (under the name 

 Delphinus), Prodclphinus (under the name Delphinus), Delphi- 

 nus, Steno. 

 Burmeister : Descripcion de cuatro especies de Delfinides de la costa 

 Argentina en el oceano Atlantico ; Anales del Museo Publico de 

 Buenos Aires, vol. i, 1864-69, pp. 367-388, pis. 21-24. Pseudorca 

 (under the name Globicephalus) , Orca, Phocccna. Figures of 

 exterior, skulls and other parts. 



