﻿DTPTER IT) -■!•:. 



23' 



compressed and pointed, the apices being inclined outwards. Fins 

 with prominent, narrow, scale-like fulcra ; distance between the 

 origin of the pelvic fins and the pectorals twice as great as that 

 between the former and the anal ; anterior dorsal fin situated 

 slightly behind the pelvic pair, very small compared with the pos- 

 terior dorsal, which is much elevated, its height being greater than 



Fig:. 37. 



Dipterus valencienncsi, Sedgw. & Murch. — Cranial shield, after Pander. 



the length of its base-line ; anal fin acuminate, very deep and 

 narrow, situated close to the lower lobe of the caudal. Scales thick 

 and punctate, exhibiting only the concentric lines of growth. 



Form. 4' Loc. Lower Old Red Sandstone : Caithness, Orkney Isles, 

 Ross-shire, Cromarty, Nairnshire, and Banffshire. 



P. 759-60. Plaster casts of two cranial bucklers, a palato-pterygoid, 

 and an imperfect palate with dental plates ; the originals in 

 the Hugh Miller Collection, Edinburgh. Egerton Coll. 



P. 6263. Plaster cast of palatal aspect of skull ; Caithness. The 

 original is preserved in the Museum of Practical Geology, 

 Jermyn St., and is described and figured by A. Giinther, 

 Phil. Trans. 1871, p. 556, pi. xxxiv. fig. 4. 



Made in the Museum. 



33153, 33165, 33178. Three imperfect heads, displaying the upper 

 aspect of the cranial buckler ; Thurso. Purchased, 1857. 



