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Show 996 DR. R. O. CUNNINGHAM ON ABNORMAL [Dec. 15, meist nicht zu sehen ist, weil fast aile Salpenarten syrnmetrische Muskeln haben." This adds an eighteenth species to the list of Salpoe occurring in the North Atlantic. It was obtained at two stations (four hauls) in small quantities : Sta. 13, 60° 2' N., 5° 49' W . ; and Sta. 19, 59° 42' N., 7° 7' W . On these four hauls it was at the surface; in two more hauls at the same stations it was also taken from uncertain horizons with an open tow-net, probably at or near the surface. EXPLANATION OF PLATE L. Sayitta whartoni, sp. n. (p. 992). Fig. 1. Ventral view. X 2. Fig. 2. Dorsal view of head, showing some of the cirrhi, the two rows of accessory teeth, and the row of sensory processes. Gam. luc. X 12. Fig. 3. Cephalic armature, a, end of cirrhus; b, tooth of ventral row; c, tooth of dorsal row. X 210. Spadella (Krohnia) hamata (p. 993). (Drawn by camera lucida.) Fig. 4. Ventral view. X 2. Salpa asymmetrica, sp. n. (p. 994). a-f. main muscles of the mantle. en. endostyle. at. atriopore. ne. nerve-ganglion. cl. cloaca. nu. nucleus. dl. dorsal lamina. pl. placenta. dt. dorsal tubercle. st. stolon. el. ela^oblast. Fig. 5. Sexual form, dorsal aspect. X 45. feg. 6. Sexual form, ventral aspect. X 4*5. Fig. 7. Solitary form, right side. X 16. Fig. 8. Solitary form, left side. X 16. 2. On the Occurrence of a Pair of Supernumerary Bones in the Skull of a Lemur and on a Peculiarity in the Skull of a young Orang. By ROBERT O. CUNNINGHAM, M.D., F.L.S., F.G.S., C.M.Z.S., Professor of Natural History, Queen's College, Belfast. [Eeceived November 9, 1896.] A short time ago, when taking part in an oral examination on zoology at the Royal University of Ireland, Dublin, I was somewhat surprised to recognize in the skull of a common Lemur a small pair of supernumerary bones intervening between the frontals, nasals, and lachrymals. As I could not find any reference to such bones in any of the works on comparative anatomy at m y disposal, I wrote to Sir William Flower, as our highest authority on the osteology of the Mammalia, to ask him if he could furnish m e with any information on the point. H e kindly handed my letter with its accompanying sketch to Dr. Forsyth Major, who showed him a skull with exactly the same bones, observing that |