STELFOX : HEREDITARY CHARACTERS OF BRITISH MOI.HJSCA. 269 



were of a deep yellow colour with translucent bands, a variety for 

 which I now propose the name of aureozotiata to distinguish it from 

 the paler form known as var. citrifiozonata of subsequent experiments. 

 All four examples possessed the normal five bands, but in the case of 

 two of these the bands coalesced as follows, i (23) (45) and (123) (45). 

 Although fully grown in 191 1 no eggs were laid until May, 19x2, and 

 the first of the Fi generation did not hatch out before the 6th July of 

 that year. Fifty-three of these were alive in the following December, 

 all of which were distinctly referable to var. aureozonattx. They 

 proved very difficult to rear, only some seven or eight reaching 

 maturity, the time required for this varying from two to five years. 

 The two furthest developed specimens were isolated in July, 1914, 

 just before reaching maturity, both having the simple band formula of 

 12345. These laid eggs about the 14th July, 1915, and the F2 

 generation appeared on the i6th August following. The time between 

 laying and hatching appears to be generally about 28 to 35 days in 

 this species, probably according to temperature, moisture and other 

 factors of environment. The young F2 were at once noticed to be of 

 a clear deep golden-yellow colour and soon proved to be all aureo- 

 zonata. It may be well to remark here that all Helix nemoralis are 

 born bandless and most of them are yellow, though the shade of this 

 colour varies from pearl-white to golden-yellow, as in the present 

 instance. Prof. Lang ^records having observed reddish tinted newly 

 hatched Helix nemoralis and H. Jiortensis hybrids and I think that 

 such have also come under my notice, although the red colour of most 

 does not become apparent until the growth has considerably advanced. 



It may be well to add what I know of the banding of Fi and F2 

 generations. Of the twelve examples of Fi which reached an age 

 sufficient to show the mature banding, seven were 12345 and five were 

 10345. The bands of a few of the former might possibly have 

 coalesced had they been grown to maturity. The latter having the 

 second band missing differ from any of the originals. Only one 

 specimen of F2 still survives and it is still too young for the banding 

 to be seen; but it will, I think, prove to be 12345. 



From the above results it appears that the parents of the Fr 

 generation were of a pure strain and from this and other experiments 

 I am inclined to regard the forms of H. nemoralis with translucent 

 bands as homozygous and recessive, at least so far as the translucent 

 band character is concerned. It has been suggested to me by Mr. 

 Watson that the results of Prof. Lang's experiments would lead one to 

 believe that the less banding, or the nearer a specimen came to being 



I " Uber die Bastarde von Helix hortensis Miiller und Heli.x nemoralis L.," by Prof. Arnold 

 Lang, Jena, igoS. Versuch xl., Pr. No. 471 ("285). 



