| OCR Text |
Show 906 MR. H. H. BRINDLEY ON THE REGENERATION [Nov. 30, The examination took no account of the sex of immature individuals, because of the very great difficulty or impossibility of rightly ascertaining it without making a dissection in each case. In the great majority of cases only one of the six legs bore a four-jointed tarsus, though many individuals possessed the abnormality on more than one leg. This point was examined in detail in rather more than one thousand young and adult individuals of both sexes distributed among three species, with the following result:- TABLE C. P. americana P. australasice S. orientalis Number of four-jointed tarsi in single individuals. 1. 155 92 583 2. 36 19 108 3. 7 4 23 4. 4 1 10 5. 1 0 0 6. 0 0 4 Number of individuals examined. cases 203 116 733 In all four species the posterior pair of legs was the most frequently affected. The following table gives the percentage incidence of four-jointed tarsi among the three pairs of legs :- TABLE D. P. americana 1 8. orientalis 1 Pair. I. II. III. I. II. III. I. II. III. I. II. III. Adult. 20 3 31-1 48-6 22-8 21 1 56T 62 18-7 75-0 26-9 229 50*2 Young. Ill 333 55*5 30-1 28-8 411 15-7 27*7 56-4 Total. 19-7 31-2 49-1 26-9 25-4 47-7 6-2 18-7 750 21*4 25*4 532 The abnormal tarsi occurred indifferently on the right and left sides-thus, in 1329 cases in S. orientalis, 661 were on the right and 668 on the left side. Having set forth the preliminary results obtained, it becomes |
