Vol. XXI 

 1904 



J Recent Literature. 497 



I 



and Corvidte, for example, one fourth to one third of the new genera, new 

 species, and new subspecies are omitted, and the titles of the papers in 

 which they are described are also absent from the general list of titles. 

 As another test, it is found that under Anatidae there are 39 references in 

 the Zoological Record and 52 under Anseres (' special ') in Vol. N of the 

 International Catalogue ; but of these 24 relate to a single work — Finn's 

 ' How to know the Indian Ducks ' — overlooked in making up the Z. R.; 

 excluding this work leaves the comparison as 39 in Z. R. against 28 

 in I. C. In the latter a titmouse {Pcecile salicaria bianchi) is included 

 under Anseres and omitted under Paridse. Further, there are only 3 

 references in the I. C. under Icteridge against 16 in Z. R., with the con- 

 sequent omission in the I. C. of 2 new genera and 12 new species and 

 subspecies. 



Turning now to 'Geographical Distribution,' and taking Africa (with 

 Madagascar) for comparison with the ' Ethiopian Region ' in the Z. R., we 

 find 16 titles under each, but of these 32 titles 12 of those in the Z. R. are 

 not in the I. C, and 11 of those in the I. C. are not in the Z. R. under 

 ' Ethiopian Region,' but several of them occur in the Z. R. list of titles. 

 Several of the I. C. titles are only remotely pertinent to the subject under 

 which they are ranged. The space occupied by the 16 references under 

 Africa in the I. C. is nearly a full page ; in the Z. R. only 4 lines, consist- 

 ing merely of cross-references to the list of titles. 



In the section Aves, as in the other sections, the titles of papers relating 

 to its subject are reprinted from the general list of titles in Part I, and 

 here segregated in alphabetic order. They are again reprinted in full 

 under each of the various subheadings of Aves to which they may relate, 

 necessitating their repetition from three to six or eight times, at great 

 expenditure of both space and funds. The subdivisions under the section 

 Aves are very numerous, as follows : — 



CoJiiparative and General Works, divided into : General, Treatises, 

 Economics, Technique, History, Biography, Bibliography, the last three 

 collectively forming one division. 



Structure, divided into : General, Comparative Anatomy, Special Anat- 

 omy and Histology, Nervous System and Organs of Sense, Osteology, 

 Alimentary System, Circulatory and Respiratory Organs, Urogenital Sys- 

 tem, Special External Characters, Organs of Uncertain Nature. 



Physiology , divided into : General, Production of Caste, Function of 

 Special Structures, Metabolism, Physiological Chemistry, Environmental 

 Effects. 



Development, divided into : General, Ogenesis and Ovum, Embryology, 

 Postembryonic Ontogeny, Changes during Life. 



Ethology, divided into : General, Habits, Migration, Hibernation, 

 Parental Relations, Sexual Relations, Oviposition, Voice, Luminosity, 

 Pelagic Animals, Instinct, Psychology, Parasitism, Colour and Habits, 

 Defensive Processes, Resemblances, Utility and Hai-mfulness. 



Variation and ^Etiology, divided into : General, Substantive-Varia- 



