iiND OTHER SPECIES OF CEPHALORHYNCHUS. 637 



Skidl. — Total length at least 29-30 cm. Rostrum about 47 pei^ 

 cent, of the total, at base half as wide as long, without pro- 

 jecting lateral lobes posteriorly. Tooth-row 41-42 per cent. 

 Posterior lobes of maxillas large, almost completely covering 

 the orbits ; the postorbital process nearly vertical and hardly 

 visible from above. PremaxillEe little prolonged behind the 

 anterior nares, the floor of the depressed triangle flat. Nasals 

 subquadrangular, meeting in a median suture, the width much 

 less than twice the length. Pterygoids separated behind by a 

 fl- or A-shaped interval ; the posterior border oblique, its tip 

 30-36 mm. from the vomer. Upper border of mandible 

 horizontal, behind the teeth, the coronoid process bluntly tri- 

 angular. 



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