Miscellaneous. 247 superior incisor is elevated and terminated by a single point ; the second, lying outwards, is low and projects but little from the gum. The ears are rounded quadrangular, entire, margined, clothed with short hairs within ; the outer margin terminates sharply a little behind the angle of the mouth, and bears there a distinct lobe. The auricle is bent inwards, rounded at the apex, broadest below the middle, and furnished with a small notch at the base. The metacarpal joints of fingers 3 to 5 differ but little from each other in length. The wing-membranes are thin, naked, and adherent as far as the roots of the toes. The interfemoral membrane encloses the tail as far as its apex, and is sparingly furnished with hair both above and below to the end of the first third. The spur bears a distinct mem-branous lobe. The penis of the male is provided with a bone. Pale brown, the hairs of the back rather darker at the base ; wing-membrane dark brown. Measurements of an adult male. metre. Total length 0-092 Head 0-016 . Entire elevation of ear 0*015 Anterior margin of ear 0-010 Breadth of ear 0-0125 Length of auricle 0-007 Length of tail 0-042 Humerus 0-024 Forearm 0-0365 Length of fingers : — 1st metacarpal, 0-0025 ; 1st phal. 0003 ; 2nd ph. 0-0025 0-0075 2nd „ 0034 ; „ 00004 0038 3rd „ 0-035 ; „ 0-015; 2nd ph. 0-0185 ; Cart. 0-005 0-076 4th „ 0-034 ; „ 0011; „ 0-0105 „ 0-002 0067 5th „ 0033 ; „ 0010; „ 0006 „ 00015 0-049 Thigh 0-018 Leg 0-018 Foot 0007 Spur 0-017 Monatsb. Bed. Akad. Wiss. Dec. 7, 1868, p. 626. . , Nudibranchs in Fresh Water. Mr. Kent described, at the last meeting of the Zoological Society, a new Nudibranch under the name of Embletonia Grayii, discovered in the Victoria Docks at Kotherhithe. When I mentioned the cir-cumstance to Dr. Mobius at Kiel, he observed : — " It was very interesting to me to find that a mollusk of the family ./Eolididse had been discovered in brackish water near London Bridge. In the Baltic Sea, Embletonia pallida extends as far as East Prussia, near Konigsberg, where the water has only 7 of salt in 1000. In like manner, Protolimax capitatus (=Limapontia nigra)
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