312 Memoir Sears Foundation for Marine Research 



Spiracles: length 2.6; distance between 6.5. 



Mouth: breadth 6.7. 



Exposed nostrils: distance between inner ends 7.0. 



Gill openings: lengths, ist 1.4; 3rd 1.9; 5th 1.3; distance between inner ends, 



ist 13.2; 5th 8.1. 

 First dorsal fin: vertical height 2.3; length of base 5.8. 

 Second dorsal fin: vertical height 2.1; length of base 4.9. 

 Pelvics: anterior margin 12.6. 

 Distance: from tip of snout to center of cloaca 39.5; from center of cloaca to 



1st dorsal 44.7; to tip of tail 60.5; from rear end of 2nd dorsal base to 



tip of tail 3.7. 

 Interspace between: ist and 2nd dorsals 1.4. 



Disc about 1.2 times as broad as long, moderately obtuse in front, tip of snout 

 hardly protruding; maximum anterior angle in front of spiracles about 128°; anterior 

 margins weakly convex from tip of snout to level of eyes, slightly concave at level of 

 spiracles and straight thence outwardly; outer corners broadly rounded; posterior mar- 

 gins weakly and evenly convex; posterior corners broadly rounded, their curvature 

 continuous to axils of pectorals. Lateral folds on tail extremely narrow, extending along 

 posterior four-fifths nearly to tip. Tail from center of cloaca to first dorsal about i.i 

 times as long as distance from center of cloaca to tip of snout, and about 1.5 times as 

 long to tip. Distance from axils of pelvics to first dorsal about as long (i.i) as distance 

 from axils of pelvics to fronts of orbits, about 90 "/o as long as distance from center of 

 cloaca to tip of snout. 



A few small thorns on anterior part of rostral ridge; 5-7 along inner anterior 

 margin of orbit;i' 1-2 on inner margin of orbit and a group of about four between 

 inner posterior edge of orbit and inner end of spiracle; about three on nuchal region; 

 2-3 on each shoulder; two rows along mid-dorsal belt of disc from a little behind 

 pectoral girdle rearward, with an occasional thorn between them in the midline; outer 

 anterior parts of pectorals sparsely strewn with small thorns grading down to prickles; 

 inner parts of pectorals as well as nuchal region roughened generally with minute 

 prickles; a few prickles here and there on anterior part of head, between thorns on 

 shoulders and along mid-dorsal belt; skin over eyes prickly; posterior parts of pectorals 

 smooth. Upper surface of tail with 3-4 irregular rows of thorns along anterior part, 

 these about as large as those on disc, decreasing to 2-3 rows rearward to first dorsal 

 fin; one thorn in interspace between first and second dorsals; each side of tail (from 

 axil of pelvic) with a band of close-set prickles along anterior half, decreasing in number 

 posteriorly to 1—2 rows interspaced with small thornlets past second dorsal fin; dorsal 

 fins and upper surface of pelvics smooth. Lower surface smooth everywhere. 



Snout in front of orbits about 3.5 times as long as distance between orbits, its 

 length in front of mouth about 1.6 times as great as distance between exposed nostrils. 



17. Five on one side and seven on the other on specimen examined. 



