612 MR. C. DAVIES SHERBORN ON A PROPOSED (June 2, 
of slips, the toughness necessary for constant handling, a surface 
equally convenient for pencil and carbon paper, and a cheapness of 
1s, 2d. per 1000 slips. The size of slip employed is 127 x 63 mm. 
(5 x 23 inches). 
Nomina nuda are distinguished by the letters |n. n.]. 
Nomina nuda accompanied by figures by the letters [7. et f.]. 
In those cases where an author has described and figured a 
species some time after printing his nomen nudum, a reference is 
also given to the nomen nudum, when possible. 
Particular attention has been paid to the date of publication of 
books, periodicals, and serials. This is a part of the work which 
demands considerable time and patience, but the results obtained 
fully justify the labour. The more important results as to dates 
already arrived at and published are :— 
Pallas, P. S., Icones Insect. (See Annals Mag. ser. 6, vii. 
p- 236, 1891.) 
Pallas, P.S., Nov. spec. Glir. (See Annals Mag. ser. 6, vii. 
p- 236, 1891.) 
Schreber, J.C. D.,Saugthiere. (See Proc. Zool. Soc. 1891, p. 587.) 
Sowerby, Genera Recent Shells. (See Annals Mag. ser. 6, xiii. 
p. 370, 1894.) 
Encyclopédie Méthodique. (See Proc. Zool. Soc. 1893, p. 582.) 
Jardine and Selby, Illustr. Ornith. (See Ibis, 1894, p. 326.) 
Moore, F., Lepidopt. Indica. (See Annals Mag. ser. 6, xi. 1893, 
p. 260, and ser. 6, xiv. 1894, p. 464.) 
Siebold, P. F. von., Fauna Japonica. (See Proc. Zool. Soc. 1895, 
p- 149.) 
The date of publication of a species is taken to be that date on 
which the print in which the name appears is offered for 
public sale or public distribution. 
No author’s copy, and no excerpt from any publication distri- 
buted privately before such publication is offered for public 
sale or public distribution, has been accepted. 
In the case of privately printed books, entries taken from them 
are distinguished by the words [auct. typ.]. 
In all cases where the date is doubtful and cannot be definitely 
ascertained, the date figures are enclosed in brackets [ ], or have 
some other distinguishing mark—e. g., ?—placed against them. 
In the case of plates appearing before the text, the date of each is 
given if ascertainable (e. g., Schreber’s ‘ Siugthiere’), but in no case 
is the date of a plate accepted in preference to the date of text, for 
the reasons which follow :— 
The figure depicted on a plate may, or may not, be the drawing 
intended by the author; it is the work of the artist, who 
is also responsible for the descriptive legend. In numerous 
instances the descriptive legend on a plate is quite erro- 
neous, and has been repudiated by the author in his text. 
Until the text descriptive of a plate appears, the names on 
the plate must be considered as nomina nuda, and it is open 
to anyone to describe and rename such nomina nuda. 
