| OCR Text |
Show 6 MR. F. H. A. MARSHALL ON [Jan. 14, (7) Females } Normal males ' «* Abnormal males with arrangement B... 4 Ditto with arrangement C 5 D _3 Total ... 86 (8) Normal males 22 Abnormal males with arrangement B... 1 Ditto with arrangement C 1 D J. Total ... 25 12 85 25 Adding all these together we arrive at the following result :- Females 68 Normal males 878 Abnormal males with arrangement B... 40 ' Ditto with arrangement C 40 77 7) 7> 7> )7 7> )) )) 5> )7 77 •7 77 5J D E F G H K L M 31 2 3 2 1 1 1 1 >122 >1000 J J Grand Total... 1068 The total number of male Norway lobsters examined being 10001, the percentage of abnormality occurring among them is shown to be 12-2. The numerical variation in the apertures, but not the variation in their arrangement, I have indicated by a percentage curve (text-fig. 3, p. 7). It is of interest to note that the homceosis occurs with little regard to bilateral symmetry. The relative scarcity of females is worthy of comment. It may be that the majority of them had migrated to a greater distance from land. The 68 specimens that were examined possessed only the normal apertures on the third pair of walking - legs. Dr. Malcolm Laurie, however, tells me of a female specimen in his possession which has two pairs, the additional ones being on the fourth pair of legs. The 1068 Norway lobsters which enter into m y calculations i Since the above was written I have received 24 male Norway lobsters from the Forth area 21 being normal, one showing arrangement C and another arrangement D, while a third presented an arrangement not hitherto nli«ov,r„i I .*™*ugement |
