NO. 7 WADE: EASTERN PACIFIC APODAL FISHES 195 



Measurements of holotype in mm. — Total length 286, head and trunk 

 106, tail 180, head 48, snout 13.1, eye 9, cleft of mouth 15, depth 19, 

 pectoral length 17, width of gill-opening 6.1, isthmus 14.5, bony inter- 

 orbital 2. 



Diagnosis. — Head and trunk 1.68 in tail, 2.7 in total length. Tail 

 much longer than head and trunk, 1.59 total length. Depth 15.1 in total 

 length. Head 1.2 in trunk, 5.95 in total length. Eye 1.45 in snout, 5.3 

 in head, mouth 3.2, snout 3.67. Dorsal origin slightly behind lower edge 

 of pectoral base. Pectoral 2.82 in head. Maxillary, premaxillary, and 

 vomerine teeth closely united at front of upper jaw. 



Description. — Body elongate, subcylindrical anteriorly, becoming 

 compressed posteriorly on tail. Dorsal and ventral outlines gradually 

 tapering to bluntly rounded tail. Tail much longer than head and trunk, 

 1.59 in total length. Head 1.2 in trunk, 5.95 in total length. Eyes moder- 

 ate, 1.45 in snout, 5.3 in head. Gape of mouth moderate, reaching to a 

 vertical from anterior edge of pupil, 3.2 in head. Snout 3.67 in head, 

 projecting moderately beyond tip of lower jaw. Dorsal origin slightly 

 behind lower edge of petcoral base, confluent with anal around tip of tail. 

 Low anteriorly, becoming higher posteriorly. Anal fin similar to dorsal. 

 Pectoral fins well developed, 2.82 in head; ventral fins absent. Gill- 

 openings low on sides, their free edges deeply curved anteriorly, obliquely 

 placed. Pectoral base entirely above upper end of gill-opening. Anterior 

 nostrils tubular, directed downward, placed near lateral edge of ventral 

 surface of snout, close to premaxillary teeth. Posterior nostrils ovate pores 

 with raised rims, placed before the eye at its mid-depth. Anteroventral 

 surface of snout with an elongate, shallow groove on its mid-line. 



Edge of upper lip not developed into an upturned flange. Lower lip 

 with a small, evenly rounded flange. Labial canal present, beginning 

 anteriorly at rostral cavity and extending backward above the edge of the 

 upper lip to beneath the eye and upward around its posterior edge. 

 Superior, inferior, and interior surfaces of canal bony, external surface 

 covered by skin only. Inferior edge of canal with three small, pointed, 

 bony processes extending downward into membrane of upper lip. Rostral 

 cavity divided into two parts by a median septum, each half opening to 

 the outside by one of the two enlarged pores between anterior nostrils. 

 On each side, close to dorsal mid-line and opening into rostral cavity 

 anteriorly, a small muciferous canal extends backward over upper surface 

 of snout to behind eyes. Three round pores with slightly raised rims 

 along the edge of the upper lip. Two small pores placed one above the 

 other before each anterior nostril at tip of snout. A large, elongate pore, 



