THE ANNALS 
AND 
MAGAZINE OF NATURAL HISTORY. 
[FOURTH SERIES. } 
No. 89. MAY 1875. 
XXXVIII.—On the Articular Bone and supposed Vomerine 
Teeth of Ctenodus obliquus ; and on Paleeoniscus Hancocki, 
n. sp., from the Low Main, Newsham, Northumberland. By 
THOMAS ATTHEY. 
[Plate XIX. ] 
Ctenodus obliquus. 
In a communication made by my late friend Mr. Albany 
Hancock and myself to the ‘ Annals and Magazine of Natural 
History,’ ser. 4. vol. vil. p. 190, we pointed out the close 
relationship that exists between the mandible of Ctenodus and 
that of the recent Ceratodus, 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 
Newsham, near Blyth, Northumberland, an angular boné 
associated with the cranial bones of Ctenodus, but could not 
make out to what 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 Forster?, 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. & Mag. N. Hist. Ser. 4. Vol. xv. 22 
