A LIST OF THE GENERA AND FAMILIES OF MAMMALS. 35 
These 16 variations of ‘beautiful mouse’ are all available as valid 
generic designations of mammals (if applied to different animals), 
according to those who ‘‘regard all generic names as different unless 
originally spelled alike." 
In common English no difference is recognized between enclosure and 
inclosure, gray and grey, meter and metre, program and programme, 
theater and theatre, and similar words. (Generic names derived from 
the same words in the same way, and therefore having the same mean- 
ing, even though differing in gender or connecting vowel, should like- 
wise be considered identical. For the sake of expediency or that there 
may be an ironclad rule which all may follow, the opposite course is 
adopted by some writers, but agreement in the matter seems almost 
impossible. <A list is here given of 43 actual cases which occur in 
mammalogy and ornithology. 
Examples of Preoccupied Names in Mammalogy and Ornithology. ^ 




Name adopted. Name rejected. Preoecupying name. Authority for name adopted. 
| E —— —— 
MAMMALS. | 
Callotaria, 1892 ...... Callorhinus, 1859 ...| Callirhinus, 1850 (Coleop- | Palmer, Proc. Biol. Soc. Wash., 
| tera). VII, 156, 1892. 
Carponyeteris, 1891 ..| Maeroglossus,1824..| Macroglossum, 1777 (Le- | Lydekker, Mamm. Liv. and 
pidoptera). |  Ext.,654, 1891. 
Conicodon, 1894. ..... Calamodon, 1874 aoe Calamodus, 1829 (Aves) ..| Cope, Am. Nat., XXVIII, 594, 
footnote, 1894. 
Dideilotherium, 1889.| Delotherium,1889 .. Deilotherium, 1882 (Un-  Ameghino, Act. Acad. Córdo- 
gulata). ba, VI, 920-921, 1889. 
Diochoticus, 1894 ....| Notocetus, 1892 ..... Notiocetus, 1891 (Bale-  Ameghino, Enum. Synop. 
nide). Mamm. Patagonie, 182, Feb., 
| | | 1894. 
Dolichophyllum,1891 | Macrophyllum, 1838. Maerophylla, 1887 (Cole- | Lydekker, Mamm., Liv. and 
optera). Ext., 673, 1891. 
Euelaphas, 1857...... | Elasmodon, 1846 ....  Elasmodus, 1843 (Pisces)... Falconer, Quart. Journ. Geol. 
| Soc., XIII, 315, 1857. 
Eurygeniops,1896....| Eurygenium, 1895 .. Eurygenius, 1849(Coleop- Ameghino, Bol. Inst. Geog. 
tera). Argent., XVII, 92, 1896. 
Hemiderma, 1855 ....| Carollia, 1838 ....... | Carolia, 1837 (Mollusca) .. Lydekker, Mamm. Liv. and 
Ext., 674, 1891. 
Hydrelaphus, 1895 ...; Hydropotes,1870.... Hydropota, 1861 (Diptera), Lydekker, Deer of All Lands, 
| 219, 1898. 
Kiodotus, 1840 ....... | Macroglossus, 1824... Macroglossum, 1777 (Le- | Blyth, Cuvier's Anim. King- 
| pidoptera). dom, 69, 1840. 
Entax5182//2- eee oper | Enhydra, 1822 ...... Enhydris, 1820 (Reptilia).| Stejneger, Naturen, 172, 1885. 
Linsang,1839 ........ | Prionodon, 1824..... Priodon, 1822 ( Edentata ) | Thomas, Ann. Mus. Genova, 
| | 24 ser., X, 9, 1892, 
Mesodectes, 1875 ..... | ISACus 195735 - 4-2 Isaca, 1857 (Hemiptera) . | Cope, Syst. Cat. Vert. Eocene, 
| | N. M., 30, 1875. 
4? Jordan & Evermann, Fishes North and Middle America, I, p. v, 1896. 
Dr. Gill states his position as follows: '* 1 agree with those who think that even a difference of à 
single letter in most cases is sufficient to entitle two or more generic names so differing to stand. 
The chemist has found such a difterence not only ample, but most convenient to designate the 
valency of different compounds, as ferricyanogen and ferrocyanogen. Iam prepared now to go back 
on myself in this respect." (Proc. Am. Ass. Adv. Sci., XLV, pp. 15-16, 1896.) 
Compare also recommendations of Carus & Stiles, Rept. on Rules Zool. Nomenclature, p. 301, 1898. 
5l am indebted to Dr. J. A. Allen, Mr. H. €. Oberholser, and Dr. C. W. Richmond for several of the 
names of birds cited in this list. 
