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Show 1902.] VARIATION IN THE NORWAY LOBSTER. 8 of frequency of these arrangements, it will be convenient to describe each of them separately. They are as follows :-- A. The normal arrangement. B. The normal apertures and two additional ones at the bases of the fourth legs, making a total of four apertures. C. The normal apertures and an additional one at the base of the left fourth leg, making a total of three apertures. D. The normal apertures and an additional one at the base of the right fourth leg, making a total of three apertures. E. The normal apertures and four additional ones on the third and fourth legs, making a total of six apertures. F. The normal apertures and three additional ones on the fourth legs and the left third leg, making a total of five apertures. G. The normal apertures and three additional ones on the fourth legs and the right third leg, making a total of five apertures. H. The normal apertures and two additional ones on the left third and left fourth legs, making a total of four apertures. K. The normal apertures and an additional one on the left third leg (there being a gap in the series), the total number of apertures being three. L. The normal apertures and two additional ones on the right third and left fourth legs, the total number of apertures being four. M . The normal apertures and five additional ones on the fourth and third legs and also on the left second leg, the total number of apertures being seven. These arrangements may be represented graphically as follows:- B. C. D. E. r. I. r. I. r. I. r. I. Third legs. Fourth legs. Fifth legs. • • F. G. H. K. r. I. r. I. r. I. r. I. Third legs. . . Fourth legs. Fifth legs. L. M. r. I. r. I. Second legs. • Third legs. Fourth legs. Fifth legs. fThe letters r. and I. denote the right and left sides.] |