552 Memoir Sears Foundation for Marine Research 



National Museum; fragments of another case, from continental slope off southern 

 Nova Scotia, Lat. 42° 38' N, Long. 64° 05' W, at 450 fathoms, July 17, 1949, trawled 

 by the research vessel Caryn, in Harvard Museum of Comparative Zoology. 



Distinctive Characters. This species is given so distinctive an appearance by its 

 long pointed snout that it could hardly be confused with any other Atlantic chimaeroid 

 except Neoharriotta pinnata from west central and southwestern Africa or Rhinochimaera 

 atlantica, known only from the Irish Atlantic slope. It is sharply set apart from the 

 first of these by its lack of a separate anal fin, from the second by the smoothness of 

 the upper margin of its caudal fin.^'* 



Description. Proportional dimensions in per cent of distance between snout and 

 origin of upper caudal fin. Males, 545 and 558 mm long to origin of upper caudal, 

 from Lat. 42° 40' N, Long. 64° 00' W and vicinity (Harv. Mus. Comp. Zool., Nos. 

 37023 and 37022, respectively). 



Trunk: breadth 8.6, 9.0; height 13.5, 13.7. 



Snout length in front of: eye 28.1, 28.7; mouth 29.4, 26.4. 



Eye: horizontal diameter 5.7, 5.0; vertical diameter 4.0, 3.2. 



Mouth: breadth 4.4, 4.0 



Nostrils: distance between 1.8, 1.8. 



Dorsal spine :\e.x\gt\\ 18.2, 18.5. 



First dorsal fin: length of base 10.6, ii.i. 



Second dorsal fin: length of base 33.8, 32.6. 



Upper caudal fin: length of base to last horny ray 30.3, 30.1. 



Lower candal fin: length of base to last horny ray 42.5, 38.2. 



Pectoral fin: length 25.9, 26.0; breadth 13.8, 15.2. 



Distance from snout to: origin of dorsal spine 42.2, 41.8; 2nd dorsal 57.7, 57.5; 

 pectoral 38.8, 40.2 ; pelvics 65.2, 61.8. 



Interspace between: ist and 2nd dorsals 5.9, 4.5; 2nd dorsal and caudal 8.8, 8.0. 



Distance from origin to origin of: pectorals and pelvics 28.6, 27.7; pelvics and 

 lower caudal fin 27.9, 27.7. 



Trunk tapering evenly rearward; strongly compressed posterior to origins of 

 pectorals; about half as thick as high at level of origin of pectorals, its sides flat or weakly 

 convex; its greatest height, opposite dorsal spine, about ^/j (78 "/o) as great as distance 

 from front of eyes to origin of pectorals, about '/4 that high close behind pelvics. 



Skin with 4-6 sharp conical denticles in a double row on top of head; also at 

 hatching a double row in interspaces between first and second dorsals and between 

 second dorsal and caudal, these disappearing so early in growth that no trace of them is 

 evident on specimens 485 mm or larger. 



Mucous canals open, as narrow slits; lateral canal irregularly wavy, descending 

 opposite upper origin of caudal to follow out along lower margin of caudal axis as in 



106. The upper margin of the caudal of K. atlantica has a series of denticles. For description, see Holt and Byrne (Fish. 

 Ireland Sci. Invest. [1908], 4, 1910: 18, pi. 3). 



