THE ANNALS 



AND 



MAGAZINE OF NATURAL HISTORY. 



[FOURTH SERIES,] 

 No. 89. MAY 1875. 



XXXVIII. — On the Articular Bone and supposed Vomerine 

 Teeth 0/ Ctenodus obliquus ; and on Palseoniscus Hancocki, 

 n.sp.,from the Low Main, Neiosham, Northumberland. By 

 Thomas Atthey. 



[Plate XIX. ] 



Ctenodus obliquus. 



In a communication made by my late friend Mi*. Albany 

 Hancock and myself to the ' Annals and Magazine of Natural 

 History,' ser. 4. vol. vii. p. 190, we pointed out the close 

 relationship that exists between the mandible of Ctenodus and 

 that of the recent Cerafodus, and showed that the upper outer 

 border of the dental plate of Ctenodus is unsupported. At 

 the date of that communication the articular bone of Ctenodus 

 had not been identified as such. 



For a good many years I had occasionally obtained from 

 the black stone overlying the Low-Main seam of coal at 

 Newshara, near Blyth, Northumberland, an angular bone 

 associated with the cranial bones of Ctenodus, but could not 

 make out to wliat precise part of the head it might belong, 

 until about three years ago, when Sir Philip Egerton kindly 

 sent me for examination two palatal teeth and a mandible of 

 the recent fish Ceratodus Forstcri, brought from Queensland, 

 Australia. A glance at the specimens showed that the bone 

 respecting which I was in doubt was the articular bone of 



Ann. d- Mag. X. Hist. 8cr. 4. Volxx. 22 



