66 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 9 



behind gill openings, confluent with the anal around the tail. Pectoral 

 fins well developed. Snout short and blunt, abruptly decurved, shorter 

 than the eye. Flange of the upper lip developed into a short, broadly 

 rounded flap, the highest part of which reaches the edge of the posterior 

 nostril and covers a hollowed-out area. Another uncovered hollowed-out 

 area below the eye. Posterior nostril with a well-developed rim, but no 

 tube, directly in contact with the eye. A well-developed, tubed pore just 

 above posterior nostril and in contact with both eye and nostril. Anterior 

 nostrils tubular, on the upper lip and near tip of snout. Maxillary teeth 

 triserial, not forming a cutting edge ; vomerine teeth in a roughly oblong 

 patch, narrower posteriorly; premaxillary teeth in a semicircular patch, 

 separated from the vomerine teeth by a narrow groove. Tongue well de- 

 veloped, the edges free anteriorly and laterally. Gill openings far apart, 

 vertical, and large. Eye large. Nine branchiostegal rays. 



Close to Ariosoma, but differing in the extremely short, blunt head ; 

 the short snout, which is shorter than the eye ; the excavated sides of the 

 head below the eye and posterior nostril ; and the wide flaplike flange of 

 the upper lip. 



Chiloconger labiatus, new species 

 Plate 7 



Holotype. — AHF no. 9. 



Type locality. — Station 856-38, Port Utria, Colombia, dredged in 

 15-30 fms., mud and sand bottom, February 25, 1938. 



Measurements of holotype in mm. — Length 83, depth 6, head and 

 trunk 33, tail 50, head 14, snout 2.8, eye 3, gape of mouth 4, pectorals 5. 



Description. — Head and trunk 1.5 in tail, 2.51 in total length. Tail 

 1.66 in total length. Head large, 2.36 in head and trunk, 5.93 in total 

 length. Snout short, abruptly decurved and blunt, 5 in head, slightly 

 shorter than the eye. Eye 4.66 in head. Gape of mouth 3.5 in head. Depth 

 13.8 in total length, 2.33 in head. Dorsal fin inserted behind gill openings, 

 over tip of pectoral fins. Dorsal and anal fins continuous around tip of 

 tail ; anal not so high as dorsal. Pectoral fins well developed, 2.8 in head. 

 Gill openings lateral, low on sides, the top of the opening at the upper end 

 of the pectoral base. Isthmus equal to length of gill openings. Gular 

 region ventrally with longitudinal folds. 



Anterior nostrils tubular, inserted on the upper lip at the tip of the 

 lower jaw. Posterior nostrils at level of lower edge of pupil, posterior 



