ZOOLOGY. 585 



are of special interest to the American naturalist. Of course zoologists 

 cultivating limited fields of research will find in omissions cause for 

 censure, and may urge that discoveries of inferior importance have 

 been noticed to the exclusion of those better entitled to it. It is freely 

 admitted that this charge may even be justly made ; but the limits 

 assigned to the record have been much exceeded, and the recorder lias 

 studied the needs of the many rather than of the few. The summary 

 is intended, not for the advanced scientific student, but for those who 

 entertain a general interest in zoology or some of the better-known 

 classes. 



A very partial bibliography of noteworthy memoirs and works relat- 

 ing to difierent class of animals is supplied, and will, it is hoped, i)rove 

 to be of use to some to whom the voluminous bibliographies and rec- 

 ords of progress in science are inaccessible. 



It has been a difiicult matter to select the titles which might be 

 most advantageously introduced in a limited report like the present. 

 Articles of a general interest or of special importance as contributing 

 to throw light on the affinities of certain groups, or monographs have 

 been given the first place. Necessarily many very important pajiers 

 have not been referred to, and very few descriptive of species have 

 been admitted, and only when unusual interest attaches to the new 

 species or the groups which they enlarge. 



The compiler desires to make special acknowledgment for most ma- 

 terial assistance to the Zoologischer Anzeiger of Professor Cams and to 

 the Journal of the Royal Microscopical Society. 



SYNOPSIS OF ARRANGEMENT. 

 I. GENERAL ZOOLOGY. 



11. PROTOZOANS. Sporozoans; Rhizopods; Infusorians. 



III. PORIFEKS. Sponges. 



IV. CCELENTEKATES. Polyps ; Acalcphs. 



Y. ECHINODERMS. Criuoids; Asterioids; Echinoids; Ilolothurians. 

 VI. WORMS. Rotifers; Piatyhelminths; Nematelminths; Annelids. 

 VII. ARTHEOPODS. Merostomes ; Crustaceans; Arachnids; Insects. 

 VIII. MOLLUSCOIDS. Polyzoans; Brachiopods. 

 IX. MOLLTJSKS. Acephals ; Gastropods; Cephalopods. 

 X. PROTOCHORDATE8. Tunicatcs. 



XI. VERTEB..ATES. Fish-like Vertebrates; Leptocardians; Selachi- 

 ans; Fishes; Amphibians; Reptiles; Birds; Mammals. 



I. GENERAL ZOOLOGY. 



Ilie deep-sea researches of the United States Fish Commission in 1884. 



Professor Verrill has given an account of the work of the steamer 

 Albatross in 1884. The exploration of the Gulf Stream region was con- 

 tinued under nearly the same conditions as in 1883, and four trips 



