186 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.9 



of gill-opening reaching upper end of pectoral base. Isthmus one-half 

 of width of gill-opening. Labial flange greatly developed, covering pos- 

 terior nostril when expanded. 



Description. — Body elongate, heavy and bluntly pointed anteriorly, 

 tapering gradually to tip of tail from greatest depth before gill-opening. 

 Head and body subcylindrical anteriorly, becoming compressed pos- 

 teriorly. Depth 15.8 in total length, 2.5 in head. Origin of lateral line on 

 side of nape midway between gill-opening and posterior edge of eye; 

 arches upward over pectoral base, thence gradually descending to mid- 

 line of sides and continuing to tip of tail. Fifty pores from its origin to 

 opposite vent, 130 pores in its entire length. 



Anterior nostrils tubular, directed downward, placed just above edge 

 of upper lip near tip of snout. Posterior nostrils small, elongate pores 

 with slightly raised rims, placed half the diameter of the pupil before the 

 eye at its mid-depth. A small, round pore immediately above each pos- 

 terior nostril, but not in contact with it. Mouth moderate, its gape 

 extending almost to posterior edge of eye, 2.95 in head. Snout projecting 

 slightly beyond tip of lower jaw, abruptly decurved, shorter than eye, 5.7 

 in head. Eyes large, 4.5 in head, interorbital narrow, 2.9 in ej^e. 



Flange of upper lip broad, developed into a high, rounded flap, up- 

 turned against the sides of the snout and in its greatest height covering 

 the posterior nostril and reaching the lower edge of the accompanying, 

 dorsally placed pore. Normally the outer portion of the flange is folded 

 downward behind the basal part, lying in the hollowed-out area covered 

 by the flange. Anterior end of flange joins the snout well above edge of 

 upper lip; immediately behind upper edge of anterior nostril. From 

 this point dorsal edge of flange curves upward until it reaches the ventral 

 edge of the small pore above posterior nostril, thence curving downward 

 around edge of eye until it joins edge of upper lip at the rictus of the jaws. 

 Lower lip flange well developed, slightly longer than maxillary flange 

 but less expanded. 



Labial canal present, extending backward from rostral cavity at tip of 

 snout to behind posterior edge of eye and upward around its posterior 

 edge. Inferior, superior, and interior surfaces bony, external surface 

 covered by skin only. No bony processes extending downward into labial 

 membrane from inferior edge of canal. Edge of lip without bony sup- 

 port. A series of four pores on each side of tip of snout. The two 

 anterior pores placed before anterior nostrils at their upper edge. The 

 third pore placed above and behind the upper edge of the anterior nostrils, 



