8 DISCOVERY REPORTS 



SCYLIORHINIDAE 



Scyliorhinus (Halaelurus) bivius (Smith). 



"Kayachai" or "Kayachaya"; "Pintarroja". 



Scyllium bivium, Smith, 1837, Proc. Zool. Soc, p. 85 (nomen nudum); Miiller and Henle, 1841, 



Plagiost., p. 8; Dumeril, 1865, Hist. Nat. Poiss., 1, p. 321; Giinther, 1870, Cat. Fish., 



viii, p. 405. 

 Scyllium brevicolle, Philippi, 1887, An. Univ. Chile, lxxi, p. 558, pi. vii, fig. 5. 

 Scyllium gayi, Philippi, 1887, Zool. Garten, p. 86. 

 Scyllium chilense (non Guichenot), Giinther, 1880, Shore Fish. 'Challenger', p. 19; Vaillant, 



1888, Miss. Sci. Cap Horn., vi. Zool., Poiss., p. 10, pi. i, fig. 1 ; Perugia, 1891, Ann. Mus. 



Civ. stor. nat. Genova (2) x [xxx], p. 608; Berg, 1895, Anal. Mus. Nac. B. Aires, iv, p. 6; 



Dollo, 1904, Res. Voy. 'Be/gica', Poiss., p. 79. 

 Scylliorhinus chilensis, Smitt, 1898, Bih. Sv. Vet.-Akad. Handl., xxiv, iv, No. 5, p. 72; Lonnberg, 



1907, Hamb. Magalh. Sammelr., Fische, p. 4; Roule, Angel and Despax, 1913, Deux. 



Expe'd. Antarct. Franc., Poiss., p. 2. 

 Scylliorhinus chilensis (part), Delfin, 1901, Cat. Peces Chile, p. 15. 

 Scyliorhinus bivius, Regan, 190S, Ann. Mag. Nat. Hist. (8) 1, p. 461; Lahille, 1921, Enum. 



Peces Cart. Argent., p. 12. 

 Halaelurus bivius, Garman, 1913, Mem. Mus. Comp. Zool., xxxvi, p. 86. 

 Scylium bivium, Lahille, 1928, Anal. Mus. Nac. B. Aires, xxxiv, p. 302, pi. ii, text-figs. 3-5. 

 St. WS 583. 2. v. 31. 53 39' S, 70 54' 30" W. Small beam trawl, 14-78 m.: 3 specimens, 

 125-170 mm. 



St. WS 586. 8. v. 31. 48 27' 30" S, 74 23' 30" W. Hand line, 22 m.: 2 male specimens, 395, 

 410 mm. 



Snout obtusely pointed, its praeoral length about equal to distance between outer 

 edges of nasal flaps ; latter without cirri, widely separated, acutely pointed and with 

 notched posterior edges ; longitudinal diameter of eye 3I to 4! in distance from tip of 

 snout to first gill-opening. Lower lip not overlapped by the upper; a distinct labial 

 fold at the angle of the mouth, extending along the lower jaw about \ the distance to 

 the symphysis. Denticles all small; no enlarged tubercles on the back. First dorsal 

 a little smaller than second, originating above end of base of pelvics ; base \ to f of 

 its distance from the second. Base of anal \\ to if as long as that of first dorsal, shorter 

 than its distance from caudal. Pectoral with rounded angles, extending f to § the 

 distance from its origin to that of pelvics. Pelvic fins not united. Back with black 

 blotches or transverse bars ; upper parts with rounded blackish spots and usually with 

 some pale spots. 



Hob. Coasts of Argentina, Patagonia and southern Chile. 



In addition to the above, there are 8 specimens (280-750 mm.) in the British Museum 

 from various localities in the Straits of Magellan, including the type of the species 

 (a stuffed skin). Two egg-capsules collected by the 'Challenger' probably belong to 

 this species. 



This species is closely related to S. chilensis (Guichenot), from the coasts of Chile 

 and Peru, in which the anal fin is 1^ times as long as the first dorsal, which measures 

 f to nearly \ of its distance from the second, the longitudinal diameter of the eye is 



