9i&6 : KB. R. O. OUUNINaHAM ON ABNOEMA.L [Dec. 15, 



meist nicht zu sehea ist, well fast alle Salpenarfcen symmetrische 

 Miiskela haben." 



Tliia adds an eighteenth species to the list of Salpas occurring in 

 the North Athiutic. It was obtained at two stations (four hauls) 

 in small quantities : Sta. 13, G0° 2' N., 5° '49' W. ; and 8ta. 19, 

 59° 42' N., T T 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). 



Pig. 1. Ventral view. X 2. 



Fig. 2. Dorsal view of head, showing some of the cirrlii, the two rows of 



accessory teeth, and the row of sensory proccdaes. 0am. luc. X 12. 

 Fig. 3. Cephalic armature, a, end of cirrlms ; 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 asymmelrica, sp. n. (p. 994). 

 a-f. main muscles of the mantle. en. endosfcylo. 

 at. atriopore. ne. norve-j;iinglion. 



cl. cloaca. nu. nucleus. 



dl. dorsal lamina. pi. placenta. 



dt. dorsal tubercle. st. stolon. 



el. elaioblast. 



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



t'ig. 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., 

 P.L.S., F.G.S., C.M.Z.S., Professor of Natural History, 

 Queen's College, Belfast. 



[Received November 9, 1896.] 



A short time ago, when taking part in an oral examination on 

 zoology at the lloyal 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 

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

 io such bones in any of the worivs on comparative anatomy at my 

 disposal, I wrote to Sir "William Plower, as our liighest authority 

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

 me with 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 



