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Show 130 MR. W. L. SCLATER ON [Feb. 1, two thirds as long as the eye; in a Sprat 35, also two thirds as long as the orbit; and in a Pilchard 71, longer than the eye. Thus these appendages in number in the hybrid (61) were less than in the Pilchard (71), but more than in the Herring(48) or in the Sprat (35) ; while their length did not quite equal that of a normal Pilchard. As to the character of these gill-rakers in the Pilchard, Sprat, and Herring : in the first the lateral denticulations are very minute, a little larger in the Sprat, and largest in the Herring; to which last those in the hybrid had the greatest affinity. Fins.-In the hybrid the distance from the end of the snout to the commencement of the dorsal fin was 3'4 inches, the entire extent of the base of the fin being inserted midway between the snout and the root of the caudal fin ; lower lobe of the caudal the longer; anal rays almost hidden by the scales. Scales.-The number of scutes 22 before and 14 behind the base of the ventral fin; they are weak. As regards the scales, two large rows exist just behind the head on the left side, and the remainder resemble to a great extent those of the Herring, but with the semicircular striae of the Pilchard. The scales on the right side are similar to those normally seen in the Pilchard. The number of scales along the body in Pilchards is from 29 to 30, in about 8 vertical rows, 17-18 scutes before the ventral fin and 14 behind it; in the Sprat 47 scales along the body in 13 rows, 21-23 strong scutes before the ventral fin and 11-12 behind it; in the Herring the numbers of rows of scales along the body vary from 53-60, and there are 13 scutes behind the ventral fin. Colours.-On the left side was seen the beautiful purplish-golden hues of the Herring, but on the right side were the silvery colours of the Pilchard. SALMO PURPURATUS. This specimen, which is 8"5 inches long, died at South Kensington in August 1885. It was one of the fishes raised from the eggs brought over from Canada by Mr. Wilmot in 1883, which were described in the Society's 'Proceedings' for 1884, p. 24. Originally imported as supposed eggs of the Salmon, the edge of the adipose dorsal fin in the fry showed the orange tints of a Trout, while the par-bands were from 7 to 10 and averaged 8_j. It is interesting, because specimens have been turned into the Thames, and were asserted to be Land-locked Salmon, which is an error of identification. 10. Notes on the Ptripatus of British Guiana. By W . L. SCLATER, B.A., F.Z.S. [Eeceived January 31, 1887.] During my recent stay in Demerara I was fortunate enough to procure a considerable number of specimens of a species of Peripatus. This singular form was first discovered in British Guiana by Mr. im Thurn, who sent examples home to Prof. Moseley. But the bottle containing the specimens was broken before arriving in England, and |