DINOTOPTEIiUS. 



277 



1. DINOTOPTERUS CUNNINGTONI. 

 Bouleng. II. cc., Tr. pi. xxxi. 



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

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

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

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

 J 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 



Fig. 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 310 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 



