278 Memoir Sears Foundation for Marine Research 



Description. Proportional dimensions in per cent of total length. Female, 651 mm., 

 from the New England coast (Harv. Mus. Comp. Zool., type, No. 847). 

 Trunk at origin of fectoral: breadth 9.1; height 10.8. 

 Snout length in front of: outer nostrils 3.4; mouth 7.7. 

 Eye: horizontal diameter 2.3. 

 Mouth: breadth 6.5; height 2.5. 

 Nostrils: distance between inner ends 3.5. 

 Labial furrow length: upper 2.2 j lower 1.6. 

 Gill of ening lengths : ist 2.2; 2nd 2.2; 3rd 2.2; 4th 2.3; 5th 2.3. 

 First dorsal fin: vertical height 9. i ; length of base 9.8. 

 Second dorsal fin: vertical height 5.0 ; length of base 7.2. 

 Anal fin: vertical height 3.8; length of base 5.8. 

 Caudal fin: upper margin 23.5; lower anterior margin 10.2. 

 Pectoral fin: outer margin 14.8; inner margin 5.7; distal margin 11.7. 

 Distance from snout to: ist dorsal 27.6; 2nd dorsal 57.7; upper caudal 76.5; 

 pectoral 19.2; pelvics 47.2; anal 61.O. 



Interspace between: ist and 2nd dorsals 21.5; 2nd dorsal and caudal 10. i; anal 

 and caudal 7.6. 

 Distance from origin to origin of: pectoral and pelvics 26.9; pelvics and anal 14.8. 



Trunk slender, without mid-dorsal ridge, its height at origin of ist dorsal (where 

 highest) a little more than V7 of its length to origin of caudal, tapering evenly rearward. 

 Body sector from snout to cloaca about as long as tail sector. Caudal peduncle slender, 

 without lateral ridges, but with a well marked precaudal pit below as well as above. 

 Dermal denticles moderately closely spaced, partially overlapping, their blades on short 

 pedicels, nearly horizontal, with 5 longitudinal ridges, the margins with as many rather 

 blunt teeth, of moderate length, the median a little longest, and the outermost very small. 



Head about Vs of total length, its dorsal profile moderately arched posteriorly but 

 flattened above anteriorly. Snout moderately thick, broadly rounded, its length in front of 

 mouth about ^3 length of head. Eye broad-oval, its midpoint about opposite front of 

 mouth, its horizontal diameter a little less than ^73 as long as snout in front of mouth. 

 Spiracle a small horizontal slit, about Vr as long as horizontal diameter of eye, on a level 

 with center of latter and behind it by a distance equal to about % the horizontal diameter 

 of eye. Gill openings all about equal in length, about as long as horizontal diameter of 

 eye, the 4th over origin of pectoral. Nostril strongly oblique, its inner end a little nearer 

 to front of mouth than to tip of snout, its anterior margin expanded as a prominent subtri- 

 angular lobe with sinuous inner margin and blunt tip. Mouth obtusely ovate, about 2V2 

 times as broad as high, occupying about % of breadth of head. Labial furrows strongly 

 developed, around corners of mouth, the upper extending about halfway toward the 

 symphysis, the lower about V2 as long as upper. 



Teeth j^ °^ IgZaZu or is ' '^°* serrate; uppers subtriangular with broad bases, the 3 at 



