Responds to CD’s two objections to the principles involved in the "Rules of zoological nomenclature": (1) that strict enforcement of the rule of priority would cause much inconvenience, and (2) attaching name of the first describer in perpetuity puts a premium on careless description by "species mongers".

Has altered and added to HES’s list [compiled for Bibliographia zoologiæ et geologiæ, edited by Louis Agassiz and enlarged by HES, (1848–54)].

On zoological nomenclature CD cites a case in which he believes more harm than good would be done by following the rule of priority. Thinks the rule of the first describer’s name being attached in perpetuity to a species has been the greatest curse to natural history. Every genus of cirripedes has a half-dozen names and not one careful description.

Sends a paper he once wrote [missing] on the subject [of zoological nomenclature].