SCHISTODELTA—SCHIZOSTOMA. 623 
Schistodelta—Continued. 
Extinct. Based on molar teeth. 
Schistodelta: Gyz6rós, divided; 6éAra, the Greek letter 4, a triangle—in allusion 
to the interruption or division of the enamel layer of the molars by a fine 
groove at the external or free apex of each triangle. 
Schistomys Awramnixo, 1887. Glires, Eocardid:e. 
Enum. Sist. Especies Mamif. Fós. Patagonia Austral, p. 13, Dec., 1887. 
Type: Schistomys erro Ameghino, from the lower Tertiary of southern Patagonia. 
Extinct. 
Schistomys: 6x16 0s, cloven, divided; js, mouse—in allusion to the upper molar, 
which is divided into two nearly equal prisms. 
Schistopleurum Nopor, 1855. Edentata, Glyptodontid:e. 
Comptes Rendus, Paris, XLI, No. 8, pp. 335-338, July-Dec., 1855. 
Species, 3: Schistopleurum typus Nodot, S. gemmatum Nodot, and Glyptodon tuber- 
culatum Owen, from the Pampas of Buenos Aires, Argentina. 
Extinct. 
Schistopleurum: Gyiórós, cloven, divided; zAevp«, side—'' parce que la carapace 
. . . n'offre jamais de segmentations latérales." 
Schizastoma (see Schizostoma ). Chiroptera, Phyllostomatid:e. 
Schizodelphis Gervais, 1861. Cete, Platanistid:e. 
Mém. Acad. Sci. Montpellier, V, pt. 1, 125-126, pl. rv figs. 1-3, 1861; Zool. et 
Paléont. Gén., 1° sér., 152, 237, 1867-69. 
Type: Delphinorhynchus sulcatus Gervais, from the Miocene of Loupian, Dépt. du 
Hérault, France. 
Extinct. 
Schizodelphis: Gxif@, to split, to divide; deA@is, dolphin—in allusion to the 
longitudinal grooves on the rostrum. 
Schizodon (sub*enus) WArERHOUSE, 1842. Glires, Octodontidee. 
Proc. Zool. Soc. London for 1841, No. cvr, 89-91, Mar., 1842; Nat. Hist. Mamm., 
II, Rodentia, 263-267, 1848. 
Type: Schizodon fuscus Waterhouse, from Valle de las Cuevas, about 6 leagues 
from the volcano of Peteroa, Chile. 
Name preoccupied by Schizodon Agassiz, 1829, a genus of Pisces. Replaced by 
Aconaemys Ameghino, 1891. 
Schizodon: 6xiZ@, to divide, to split; 66@v=66 ovs, tooth—tfrom the fact that **the 
crown of each molar is divided into two parts by the meeting of the folds of 
enamel of the outer and inner side,’’ thus forming a series of cylinders which 
are compressed antero-posteriorly. 
Schizodon Srurcnsury, 18538. Marsupialia, Phalangerid:e. 
“Rept. Geol. Surveyor, Australia, 1853"' (fide Owzw, Phil. Trans. Roy. Soc. 
London, vol. 149 for 1859, 320, 1860). 
Extinct. ‘‘The portion of the lower jaw with the carnassial and tubercular teeth 
of the same extinct species [ Thylacoleo carnifer Owen], which was obtained by 
my friend Mr. Stutchbury during the period in which he was fulfilling his valu- 
able duties as ‘Geological Surveyor’ of the colony of Australia, is alluded to 
under the name Schizodon in a Report to the Colonial Secretary, dated Darling 
Downs, Ist October, 1853. If this generic name had had priority of the one 
given by me to the same extinct genus, it must have been suppressed, since 
Schizodon had been previously applied in 1829 to a genus of Fishes, which still 
retains it, by Agassiz; to a genus of Mammals by Mr. Waterhouse, in 1842; 
and slightly modified as Schizodus to a genus of Mollusks by Mr. King." 
Schizostoma Gervais, 1855. Chiroptera, Phyllostomatid:e. 
Expd. Comte de Castelnau, Am. Sud, Zool., Mamm., 49, 1855 (also pp. 44-45). 
Schizastoma Gray, Cat. Bones Mamm. Brit. Mus., 88, 1862. 
