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Show 1869.] MR. W. S. KENT ON A NEW NUDIBRANCH. 109 while the abdominal parts are light yellowish. As they grow older they alter little. 4. Males a couple of years old or more become of a rich brown shade on the back and sides, and lighter or yellowish beneath. Old males alone are maned. 5. There is a sparse underwool on the young, which sensibly diminishes with age. 6. The skulls of the adult male and female differ considerably, the latter being comparatively the narrower of the two-the former possessing a somewhat different form of teeth, besides proportionally immense canines. 7. The teeth of Otaria jubata are occasionally subject to a peculiar wearing, of a median constricted character. - 8. The sexes differ in size, the males attaining far the largest growth. 9. Between the female and male of this species there is a wide difference as regards the stretch of the pectoral flippers. In the skin of the male the breadth from tip to tip of the fore flippers is equal to or greater than the length of the body; in the female the reverse obtains. This fact points to greater strength and swimming-power in the former. 10. It appears that the Elephant-Seal (Morungu elephantina) is now only rarely met with in the Falklands. 11. The bones of the pectoral limb of the Fur-Seal of commerce (Otaria nigrescens, Gray) differ from those of the Sea-lion (Otaria jubata). DESCRIPTION OF PLATE VII. Fig. 1. Adult male Otaria jubata, from the skin No. 1. The abraded surfaces have not, however, been delineated. 2. Adult female of the same species, from the skin described as No. 2. 3. Young Otaria jubata, about four months old, referred to as No. 10 in the preceding list. 5. On a new British Nudibranch (Embletonia grayi). By W . S. K E N T , F.R.M.S. (Plate VIII.) The last October excursion to the Victoria Docks of the Quekett Microscopical Club afforded me the pleasure of capturing, in some quantity, a minute representative of the Nudibranchiate Mollusca. It belongs to Alder and Hancock's genus Embletonia, which is characterized as follows : - " Head terminal, furnished with two flattened lobes, broadly expanded laterally. Tentacles two in number, linear. Branchiae papillose, placed in a single or double row down each side of the back, alternating posteriorly." Three species are described by the authors above quoted, viz. E. pulchra, E. minuta, and E. pallida. Of these, Embletonia pallida is the most closely allied |