CADUCIBRANCH1ATA. 3 1 



short; tail much compressed; blackish above with large 

 irregular yellow spots, confluent on sides; below yellow- 



BICOLOR* 



C. Costal grooves twelve; mucous pores on each 

 side the muzzle. 



(a) Larger species with two distinct plantar tuber- 

 cles. 



(b) No canthus rostralis; head longer. 



External nares as widely separated as inner; frontal 

 and nasal region very convex in transvere section ; teeth 

 in four distinct series forming together a V with concave 

 sides projecting between the nares; body long, tail short; 

 color brown obscurum. 



External nares nearer tog-ether than the internal on 

 account of narrower muzzle; brown with usually small 

 spots; brown always predominating; teeth continuous 

 or slightly interrupted externally tigrinum. 



External nares as widely separated as internal ; muzzle 

 broad, obtuse;brown,yellow spotted,the yellow spots large, 

 often excluding the ground color; teeth continuous, or 

 slightly interrupted 1 externally mavortium. 



External nares as widely separated as internal; muzzle 

 broad, obtuse ; dark brown, with vertical spots on sides ; 

 teeth in four distinct series, in a nearly transverse line- 



TRISRUPTUM. 



bb. Canthus rostralis distinct; tail longer than head 

 and body, head shorter. 



External nares nearer together than internal; muzzle 

 obtuse, head small, width five times to groin; front con- 

 vex; vomerine teeth in one series slightly convex for- 

 wards; yellow, with irregular brown bands above... 



XIPHIAS. 



