556 



THE AMERICAN NATURALIST [Vol. LII 



induced as a regular thing in different oceanographic regions 

 can not as yet be stated. 



.v. r. 



1901. The Echinoderms of Porto Rico. Bull. IT. S. Fish Comm. 



1900, Vol. 2, pp. 231-263. 

 1904. The Echinoderms of the Woods Hole Region. Ibid., for li 



pp. 545-576. 



Vol. 24, pp. 443^45. 

 19166. Cell Penetration by Acids. 



Blue Pigment of Chromodo', 



1916. Ophiura brevispina. II. An Embryological Contribution and a 

 Study of the Effect of Yolk Substance upon Development and 

 Developmental Processes. Jour. Morph., Vol. 27, pp. 413- 



W. J. Crozier 



A CASE OF ABNORMAL INHERITANCE IN 

 DROSOPHILA MELANOGASTER 



Among great numbers of cultures one is occasionally found 

 which gives exceptional results not explainable by the usual 

 mode of inheritance. Although such cases do not aid in under- 

 standing genetic problems unless the mechanism involved is 

 worked out, the present case seems to be sufficiently remarkable 

 to merit brief mention. The writer has no explanation to offer. 



In culture 76, which was made up February 9, 1917. a large 

 preponderance of males was observed, the ratio being 38 males 

 to 3 females, and the males included unexpected classes. The 

 parents of the culture were one homozygous eosin ruby forked 

 female from stock and a male which was normal wild-type in 

 all respects with the exception that the posterior cross veins of 

 the wings were missing. His pedigree is unknown and he was 



