228 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



Subgenus Proscymnodon Fowler 



Second dorsal origin above ventral origin, fin greatly larger than 

 ventral. Dorsal spines short, not half height of fins. Pectoral 

 nearly reaches opposite first dorsal origin, which at first third in 

 total length. Orbit but little shorter than snout. 



SCYMNODON PLUNKETI (Waite) 



Centrophorus plunketi Waite, Trans. New Zealand Inst., vol. 42, 1909, p. 384, 

 3 text figs, (mouth, teeth, scales), pi. 37, 1910 (type locality: off Kaikoura, 

 New Zealand); vol. 46, 1913, p. 127, pi. 3, 1914 (young) (Kaikoura).— 

 Phillipps, New Zealand Journ. Sci. Techn., vol. 10, p. 225, fig. 6, 1928 (off 

 Kaikoura ) . 



Scymnodon plunketi Gabman, Mem. Mus. Comp. Zool., vol. 36, p. 210, 1913 

 (compiled). — Fowler, Proc. 4th (1929) Pacific Sci. Congr., Java, p. 496, 

 1930 (reference). 



Proscymnodon plunketi Whitueiy, Mem. Queensland Mus., vol. 10, pt. 4, p. 199, 

 1934 (reference). 



Depth 5% to subcaudal origin; head 5%, width about 1%. Snout 

 3% in head; orbit 314, slightly greater than snout; mouth width 

 equals preoral length, which 2i^ in head, deep groove and labial 

 fold at each mouth angle, lower little shorter; upper teeth small, 

 very acute, in 4 rows, 2 rooted ; lower teeth in single row of 30, form 

 upper oblique cutting edge with laterally directed cusp; nostrils 

 midway in snout length, inferior, internarial 1^ in preoral length; 

 jnterorbital low. Gill openings equidistant, half of orbit, before 

 pectoral. Spiracle large, orbital length posterior to eye. 



Scales on snout tip granular, mosaiclike, on head otherwise and 

 rest of body and fins imbricate, strongly tricarinate and tricuspid; 

 lateral ridges and cusps strong as median, not quite so long; each 

 scale with many as 8 roots. 



First dorsal origin slightly behind depressed pectoral tip, fin length 

 equals head ; second dorsal origin opposite ventral origin, fin length 

 equals head to third gill opening, little higher than first dorsal 

 height; caudal 3l^ in rest of body, front subcaudal edge 1% in caudal 

 length; pectoral equals head to first gill opening, width 2% its 

 length ; ventral length II/2 in head ; least depth of caudal peduncle 3. 



Uniform dark brown. Length 1,414 mm. (Waite.) 



Off Rileys Islands, New Zealand. 



Genus CENTROPHORUS Muller and Henle 



Centrophorus Mtjixeb and Henle, Arch. Naturg., 1837, p. 398. (Type, Squalus 



granulosus Schneider, monotypic.) Syst. Beschr. Plagiostomen, p. 88, 1841. 



(Type, Squalus squamosus Bonnaterre, designated by Swainson, Nat. Hist. 



Animals, vol. 1, p. 146, 1838, invalid.) 

 Lepidorhinus Bonapabte, Nuov. Ann. Sci. Nat. Bologna, vol. 2, p. 207, 1838. 



(Type, Squalus squamosus Bonnaterre, monotypic.) 

 Machephilus Johnson, Proc. Zool. Soc. London, 1867, p. 713. (Type, Machephir 



lus dumerilli Johnson, monotypic.) 



