504 Memoir Sears Foundation for Marine Research 



Nostrils: distance between inner ends 3.2, 2.6. 



Labial furrow length from corner of mouth: upper 1.8, 1.8; lower 2.0, 1.6. 



Gill opening lengths: ist r.6, 1.8} 2nd 1.6, 1.85 3rd 1.6, 1.9; 4th 1.9, 1.9; 5th 



2.1, 2.1. 



First dorsal -fin: vertical height 5.3, 4.4; length of base 4.9, 5.2. 



Second dorsal fin: vtTt\zz\he.\ght. 6. 1, 5.9; length of base 6.2, 6.8. 



Cfl«ii<z/^«; upper margin 25.2, 2 1.8 J lower anterior margin I2.l, 11. 3. 



Pectoral fin: extreme length 14.1, 13.O; extreme breadth 6.2, 6.3. 



Distance from snout to: ist dorsal 35.3, 34.2; 2nd dorsal 60.2, 63.OJ upper 



caudal 74.8, 78.25 pectoral 22.1, 19.7; pelvics 55.4, 57.6. 



Interspace between: ist and 2nd dorsals 20.6, 23.5; 2nd dorsal and caudal lO.o, 



9'5- 



Distance from origin to origin of: pectoral and pelvics 36.8, 39.2; pelvics and 



caudal 17.9, 18.2. 



Trunk slender, subcylindrical, its height at ist dorsal a little less than Yq (15 to 

 16%) its length to origin of caudal. Body sector to cloaca a little less than twice as long 

 as tail sector, the back without mid-dorsal ridge. Caudal peduncle without lateral ridges 

 or precaudal pits. Dermal denticles, over trunk as a whole, small, loose-spaced, scale-like, 

 their blades close to the skin, thick, quadrate, with 3 weak ridges uniting posteriorly at the 

 margin in a tooth that varies in length and in acuteness from denticle to denticle 5 pedicels 

 thick and short. Denticles on lower side of snout overlapping, ovate, without marginal 

 teeth, but usually with 3 weakly marked longitudinal ridges. 



Head about % (24 to 25%) of length to origin of caudal, strongly flattened above. 

 Snout thick, fleshy, broadly rounded or slightly ovate anteriorly, very short, its length in 

 front of mouth being only V4 to Vs (about 22%) as great as that of head. Eye oval, its 

 horizontal diameter % to nearly % as long as snout in front of mouth in late embryos and 

 newly born specimens, but decreasing in relative size with growth to only about V2 as long 

 as snout in front of mouth and thus only about % as long as head in adult, its midpoint a 

 little anterior to front of mouth. Spiracle on dorsal side of head a little above level of eyes, 

 transverse, about ^2 as long as horizontal diameter of eye. Gill openings small, the longest 

 about V2 as long as horizontal diameter of eye in newborn, but about as long as eye in adult, 

 low on the sides, the 5th close in front of pectoral. Nostril close to anterior margin of snout, 

 oblique, about V2 as long as horizontal diameter of eye, its anterior margin with a low, 

 triangular lobe, rounded "at the tip. Mouth only very slightly arched, its breadth about as 

 great as length of snout in front of mouth. Lips noticeably thick and fleshy, but without 

 special cartilaginous supports near corner of mouth, the lower lip free, but the upper joined 

 to gum along central Vs of jaw. Upper labial fold extending about Vs of distance toward 

 symphysis, but lower less than V2 that far. Pit at corner of mouth extremely voluminous, 

 but its rearward prolongation extending only about Vs or Ve of the distance toward the ist 

 gill opening. 



