508 
Cystocephalus Rail., 1895, not Léger, 1892. 
Diceras Rud., 1810, not Lam., 1805. 
Dipeltis Cobb, 1891, not Pack., 1885. 
Discophora Vill., 1875, not Boisd., 1836. 
Eucamptus Duj., 1845, not Chevr., 1833. 
Eurystoma Marion, 1870, not Raf., 1818. 
Fimbria Cobb, 1894, not Bohadseh, 1761. 
Hoplocephalus Linst., 1898, not Cuy., 1829. 
Leptoderes Duj., 1845, not Serv., 1839. 
Litosoma Ben., 1873, not Douglas & Scott, 1865. 
Mitrephorus Linst., 1877, not Schoenherr, 1837. 
Oxzysoma Schneid., 1866, not Gerv., 1849. 
Oxzystoma Buetschli, 1874, not Dum., 1806. 
Oxzyurus Lam., 1816, not Raf., 1810. 
Paradosxites Lindem., 1865, not Goldf., 1843. 
Pelodytes Schneid., 1860, not Fitz., ante 1846. 
Pterocephalus Linst., 1899, not Schneid., 1887. 
Ptychocephalus Dies., 1861, not Agassiz, 1843. 
Rhabdogaster Metschnikoff, 1867, not Loew., 
1858. 
Ehabdonema Leuck., 1883, not Kuetzing, 1844. 
Ehabdonema Perr., 1886, not Kuetzing, 1844. 
Rhytis Mayer, 1835, not Zed., 1803. 
Spilophora Bast., 1865, not Bohem., 1850. 
Spinifer Linst., 1901, not Raf., 1831. 
Spira Bast., 1865, not Brown, 1838. 
Spirura Dies., 1861, not E. Bl., 1849. 
Trichina Owen, 1835, not Meig., 1830. 
Trichoderma Greef, 1869, not Steph., 1835. 
Trichodes Linst., 1874, not Herbst, 1792. 
Triodontus Looss, 1900, not Westwood, 1845. 
Tropidurus Wiegm., 1835, not Neuwied, 1824. 
Tropisurus Dies., 1835, not Neuwied, 1824. 
GORDIACEA: 
Paragordius Montgomery, 1898, —Camerano, 
1897. 
ACANTHOCEPHALA: 
Arhynchus Shipley, 1896, not Dejean, 1834. 
Neorhynchus Ham., 1892, not Sclater, 1869. 
11. The names in question are published 
for the information of all persons interested. 
Objection to the proposed action should be 
filed with the undersigned secretary not later 
than January 1, 1913, together with ground 
upon which objection is based. 
12. The above names will be forwarded im- 
mediately to the International Commission 
on Medical Zoology, and to the special sub- 
committees in the groups in question for 
special report. 
13. The list will be forwarded about July 
1, 1912, to the International Commission on 
SCIENCE 
[N.S. Vou. XXXV. No. 900 
Zoological Nomenclature, and the secretary 
expects to call for a vote on these names at 
the next regular meeting of the commission, 
in the summer of 1913. 
14. The secretary takes this opportunity to 
state that his policy is to bring into the list a 
number of names upon the adoption of which 
no difference of opinion seems to exist, and to 
reject a large number of preoccupied names, 
before he submits for study the names upon 
which differences of opinion are expressed by 
authors. OC. W. Stes, 
on Zoological Nomenclature 
Secretary International Commission 
SPECIAL ARTICLES 
ON THE ORIGIN OF A PINK-EYED GUINEA-PIG WITH 
COLORED COAT’ 
THE rediscovery of Mendel’s law in 1900 
with the immediate and striking verifications 
which it received from both animal and plant 
breeders gave great impetus to the mutation 
theory of De Vries, and secured wide accept- 
ance of the idea advanced earlier by Galton 
and Bateson that new organic forms arise only 
as discontinuous variations, in the production 
of which continuous or fluctuating variations 
have no part. An extreme form of this idea 
has been ably advocated by Johannsen in his 
pure-line conception of heredity. This has 
met with a reception so hearty that it is now 
endangered chiefly by the zeal of its adherents, 
who seem to some of us to be carrying the doc- 
trine to ridiculous lengths. They can see 
nothing but pure lines in heredity of any sort; 
selection is wholly rejected except as an in- 
strument for the sorting out of genes. Pos- 
sibly this is the correct interpretation of the 
action of selection, but if so it will be found 
necessary to invoke the existence of multiple 
and subsidiary genes to such an extent that 
continuous and discontinuous variation will 
become practically indistinguishable. I am 
inclined, therefore, to question the validity of 
1In the investigation described in this paper the 
author was aided by a grant from the Carnegie 
Institution of Washington, for which grateful 
acknowledgment is here made. 
