996 BE. a. o. cutftfiffGHAM ox ABNORMAL [Dec. 15, 



meist nicht zu sehen ist, well fast alle Salpenarten sjmmetrische 

 Muskeln haben." 



This adds an eighteenth species to the list of Salpse 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. 

 Sagitta 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. Cam. Inc. X 12. 

 Fig. 3. Cephalic armature, a, end of cirrhus ; b, tooth of ventral row ; 



c, tooth of dorsal row. X 210. 



Spadella (Kroknia) 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. pi. placenta. 

 dt. dorsal tubercle. st. stolon. 



el. elaeoblast. 



Fig. 5. Sexual form, dorsal aspect. X 4'5. 

 Fig. 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 Oraug. 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 some- 

 what surprised to recognize in the skull of a common Lemur a 

 small pair of supernumerary bones intervening between the 

 f rentals, nasals, and lachrymals. As I could not find any reference 

 to such bones in any of the works on comparative anatomy at my 

 disposal, I wrote to Sir William Flower, as our highest authority 

 on the osteology of the Mammalia, to ask him if he could furnish 

 me witli any information on the point. He kindly handed my 

 letter with its accompanying sketch to Dr. Forsyth Major, who 

 showed him a skull with exactly the same bones, observing that 



