108 S. A. Miller—Glyptocrinus and Reteocrinus. 
and imposing a new name on the three-toed group which Swainson 
had called Picumnus.” 
“When no type is indicated, then the original name 18. ito be 
kept for that subsequent subdivision which first received it 
‘“* When the evidence as to the original type of a genus is not 
perfectly pre and indisputable, then the person who first pr 
vides the genus may affix the original name to any portion of it 
at his discretion, and no later author has a right to si stoe that 
name to any par rt of the original genus.’ 
en an author ep the law of: priority, by giving a 
new name to a genus which has been properly defined and named 
already, the only penalty which can be attached to this act of 
negligence or injustice is to expel the name so introduced from 
the pale of science.’ 
“When two authors define and name the same genus, both 
making it exactly of the same extent, the later name should be 
canceled in toto, and not retained in a ‘modified sense,’ 
“No special rule is fag eae for the cases in which the later of 
two generic names is so defined as to be less extensive in significa- 
tion than the earlier, Yor if the later includes the type of the “earlier 
genus, it would be canceled by the operation of the rule that the 
generic name should always be retained for that portion of the 
original genus which was Seca typical by the author.’ 
“Tf the later name be so defined as to be equal in extent to 
two or more previously published genera, it must be canceled, 
in toto. 
“A genus compounded of two or more previously peepee: 
genera, whose characters are now deemed insufficient, shoul 
retain the name of one of them. If these po net generic names 
differ in date, the oldest one should be the one adopted.” 
The committee on zoological nomenclature, consisting of 
Wm. H. Dall, who was assisted by Dr. Asa Gray, appointed 
by the American Association for the Advancement of Science 
in 1876, reported to the Nashville meeting in 1877. Upon the 
subject ‘of names to be preserved in writing, dividing or modi- 
fying the limits of existing groups, the committee said : 
“§1L. A change in the diagnostic characters, or a revision 
which carries with it the exclusion of certain elements of a group, 
or the inclusion of new ate does not authorize the change of 
the name or names gro 
“SLL When a gr vid Bes or “genus is sate into two or more 
groups, the o riginal : name t be preserved and given to one of 
the principal divisions. The division including the. typical species 
of the primitive genus, if any type been specified, or the 
. 
is to be pre- 
