56 



JOURNAL OF CONCHOT.OGY, VOL. l6, NO. 2, AUGUST 30, I9I9. 



proportionate results would hardly be affected. 



Incidentally it is worthy of note that the periods of incubation varied 

 considerably. The Scarborough specimens, placed in a bow window 

 so as to get a maximum of light and heat, hatched sooner by several 

 days than those kept in Leeds. The latter were placed near a 

 window, but subject only to diffused light, and never to direct 

 sunlight. 



Another difference noted is the smaller number of young obtained 

 in Leeds as compared with similar batches hatched at Scarborough. 

 My friend Mr. Steplienson, of Leeds, hatched out three batches of 

 eggs, numbers 41, 42, 43, the results of which he has kindly allowed 

 me to add to my lists. 



P'or convenience of reference I have placed together the results 

 from sinistral parents omitting those from dextral parents. 



Nos. II, 21, 25 and 31 were infertile, and the egg masses gradually 

 decayed. Nos. 14, to 20 and nos. 23, 24, 27, 28 and 32 were from 

 dextral parents and the results from these are not given in detail. 





RESULTING YOUNG. 



NO. OF RECEPTACLE. 



DEXTRAL. 



SINLSTRAL. 



I 



40 







2 



51 







3 

 4 



5 

 *6 







. 3 







33 



13 



8 

 34 



7 

 8 



115 

 68 





 I 



9 



86 



I 



10 



118 







12 



16 



I 



*i3 



IS 



19 



26 



13 







29 







22 



30 



22 







33 



14 



3 



34 



24 







41 

 42 



25 

 38 





 



43 



25 







Total . . . 



696 



. 138 



See note later. 



