DTPTERIDJE. 
237 
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 valenciennesi, 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. Loc. Lower Old Fed Sandstone : Caithness, Orkney Isles, 
Eoss-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. 
