DLNOTOPTBRUS. 



277 



1. DINOTOPTERUS CUNNINGTONT. 

 Bouleng. 11. cc, Tr. pi. xxxi. 



Depth of body 7^ times in total length, length of head 3f times. 

 Head extremely flattened, 1| times as long as broad, its upper surface 

 covered with very thin skin and rugose with stripe radiating from the 

 occipital region; frontal fontanelle large, 2£ times as long as broad, 

 £ length of head; occipital fontanelle very small; a rather long and 

 narrow occipital process ; snout broad, truncate, not projecting beyond 

 mouth ; eye small, 3 times in length of snout, 1\ times in interorbital 



Tig. 228. 



Dinotopterus cunningtoni. 

 Adult and young, types (Tr. Z. S. 1906). |. 



width ; nasal barbel f length of head ; maxillary barbel a little longer 

 than head, reaching posterior third of pectoral ; outer mandibular 

 barbels once and ^ as long as inner and nearly as long as head. Jaws 

 with bands of minute villiform teeth ; similar teeth form a rather broader 

 crescentic band on the vomer. Gill-rakers very long and slender, closely 

 set, about 110 on anterior arch. Dorsal 53, its distance from occipital 

 process ^ length of head ; adipose dorsal low and short, in contact with 

 caudal. Anal 43, separated from caudal by a space equal to twice 

 diameter of eye. Pectoral \ length of head ; spine rather weak, not 



