C. J. Bond 103 



In 19 a dark duplex ray was present on a lighter shade of brown or 

 yellow as a background, the other eye being also light duplex. 



In two of the 40 cases there was more than one ray. In five cases 

 the pigment covered more than half the surface of the iris in a con- 

 tinuous sheet with sharply defined ray-like margins. 



In nine cases the duplex ray in the one eye was associated with the 

 ring duplex pattern in the other eye. 



In one case both eyes were of the duplex type, but in the left eye 

 the anterior pigment was absent from two small triangular areas, one on 

 either side of the iris in the equatorial line, thus giving the appearance 

 of two pale blue rays in these situations. In one case only was the 

 irregular ray pattern bilateral (E. Frake, Pi). 



The Hereditary Transmission of the Ray Pattern. 



In 19 cases in which the eye colour of the parents could be verified 

 by personal examination, in 15 one parent was duplex and one simplex, 

 in four cases both parents were duplex. 



Four families (Baines, Frake, Masters and Whitby) are of especial 

 interest in which more than one example of the ray pattern occurred in 

 the same family, and their pedigrees are shown as far as the facts could 

 be ascertained in the accompanying tables. 



In the "A" family (Masters), Fig. I, two sisters D. M. and I. M. showed 

 narrow but distinct dark brown rays on a yellow and blue background 

 respectively in different eyes and on different sides of the iris in each 

 case. In one the other eye was faintly duplex, in one simplex. The 

 father of these children was simplex and the mother dark duplex. 

 Three other children were regular simplex and one regular duplex in 

 the same family. 



In the "B" family (Baines), Fig. II, the father G. B. had a well- 

 marked duplex ray covering the inner half of the left iris, the remainder 

 being blue and the right iris yellow duplex in the ring form. 



One daughter F. B. had a corresponding yellow brown ray covering 

 the outer side of the left iris, the inner half being blue and the right 

 eye yellow brown ring duplex like the father. 



One son W. B. the lower half and inner and outer quadrants of the 

 right iris were brown leaving a ray of blue in the middle of the upper 

 half of the iris. The left eye was ring duplex like the father and 

 sister. 



The mother of this second family of ten children, of which two were 

 of the ray pattern and the remainder all simplex with the exception 



Journ. of Gen. ii 8 



