446 



ON A NEW FISH FROM THE LOWER CHALK OE DOVER. 



EXPLANATION OF PLATE XIX. 



Daptinus intermedins, n. sp. 



den. Dentary bone of mandible. 



mt.pt. Metapterygoid. 



a. Transverse section of a tooth. 



ms.pt. Mesopterygoid (or entoptery- 



art. Articular bone of mandible. 



goid). 



mx. Maxilla. 



qu. Quadrate. 



p.mx. Prasrnaxilla. 



sym. Symplectic. 



eth. Ethmoid. 



pi. These letters are placed upon 



pr.fr. Prefrontal, 



some pyrites which pro- 



fr. Frontal. 



bably covers the palatine. 



pa. Parietal? 



na. Nasal bone ? 



s.o. Supraoccipital. 



ju. Jngal? 



ep.ot. Epiotic. 



pr.op. Praeoperculum. 



pt.ot. Pterotic. 



op. Operculum. 



sp.ot. Sphenotic (or postfrontal). 



s.op. Suboperculum. 



a.s. Alisphenoid? 



pt.tem. Posttemporal. 



h.m. Hyo mandibular. 



3,6,7,8. Vertebrae. 



The letters have the same signification in all the figures. 



Fig.l 



View of the left side of the head, with vertebrae, &c. Two thirds natural 

 size. 



2. Skull, seen from above, with left praemaxilla and maxilla,. 



3. View of skull from behind, to show the manner in which the sides are 



depressed ; natural size. In this view the skull is almost hidden by 

 the matrix. 



4. The symphysial surface of mandible, seen from before. 



Discussion. 



Mr. Etheridoe remarked on the character of the work done by 

 the author, and called attention to the interesting specimens still 

 remaining undescribed in some of the museums of this country. 

 Many of the fish-remains from the English Chalk are well worthy 

 of careful study by competent ichthyologists. 



