A REVIEW OF THE CHROMOSOME NUMBERS IN THE 



METAZOA 



Part I 



ETHEL BROWNE HARVEY 



Cornell University Medical School 



The following tabulation comprises the chromosome work 

 that has been done since the pioneer researches of Van Beneden 

 in 1883 until the end of 1915. The list is as complete as possi- 

 ble, and recourse has been had in all cases to the original publi- 

 cations. All the authorities have been given for each species, 

 even when the accounts are conflicting, and these are given in 

 the order of priority. All the species are classified and the vari- 

 ous phyla, genera, families and species are arranged in alpha- 

 betical order. The present paper includes the Annelida, Arthro- 

 poda and Coelenterata, and will be followed by a second paper 

 including a tabulation of the other invertebrates (excluding 

 Protozoa) and the vertebrates together with some general re- 

 marks. Some of the most important abbreviations are : 



chrom = chromosome pa = parthenogenetic 



cl = cleavage p.b. = polar body 



div = division . prim = primordial 



el = elements pron = pronucleus 



fert = fertilized som = somatic 



mat = maturation spc = spermatocyte 



oog = oogonia spg = spermatogonia 



"X to pole" means that X passes undivided to one pole. 

 "XY to poles" means that X and Y pass to opposite poles. 

 "From correction in" means that the tabulation as given is a correction of 

 an earlier account. 



JOURNAL OP MORPHOLOGY, VOL. 28, NO. 1 

 DECEMBER, 1916 



