MYXINIDAE 7 



Six branchial pouches. 10 or 1 1 (9 in young) teeth in the first series, 9 to 1 1 (generally 

 10 or 1 1) in the second, the 2 most anterior united. Pores 28-34+63-69 +9-13. Length 

 of head 3^ to 3 § in the total length. Labrum shorter and more obtusely pointed than 

 in M. australis. Coloration of freshly preserved specimens purplish brown, with a 

 narrow area of sharply contrasted yellowish white along the ventral surface. 



Hob. Coasts of Patagonia and southern Chile. 



In addition to the above there are 8 specimens (165-490 mm.) in the British Museum 

 from Orange Bay, Cape Gregory, Puerto Bueno, Messier Channel and Sandy Point, 

 including the type of the species. 



Myxine tridentiger, Garman. 



Myxine australis (part), Giinther, 1870, Cat. Fish., VIII, p. 511 ; Gunther, 1887, Deep-Sea Fish. 



'Challenger', p. 267. 

 Myxine tridentiger, Garman, 1899, Mem. Mas. Comp. Zool., xxiv, p. 345; Regan, 1913, Ann. 

 Mag. Nat. Hist. (8) xi, p. 396. 



Six branchial pouches. Ten teeth in each series, the 3 most anterior in the first 

 series and the 2 most anterior in the second series united. Pores 22+62+9. Length 

 of head 3§ in the total length. Left branchial aperture widely separated from that of 

 the oesophageal duct. 



Hub. Straits of Magellan. 



Known only from the unique holotype, 460 mm. in total length, from Sandy Point. 



LAMNIDAE 



Cetorhinus maximus (Gunner). 



During the summer of 1926 or 1927 a large shark was found dead on the north coast 

 of East Falkland, north by west of Stanley, about midway between McBride's Head 

 and the entrance of Salvador Waters. The length was said to be more than 30 ft. 

 A strip of teeth was taken from the jaws and sent to the British Museum for identifi- 

 cation. 1 This was an undoubted Basking Shark, the southern representative of the 

 common Cetorhinus maximus of the northern hemisphere, and may prove to be a distinct 

 species. 



A shark observed by Mr J. E. Hamilton in 1936 probably belongs to this species. 

 He says : 



I watched it for about forty minutes as it cruised about on the edge of a Macrocystis bed off Cape 

 Dolphin. It had an anterior dorsal fin which may have been thirty inches in height and a much 

 smaller posterior one. The colour was very dark grey or black with a pale mark on the larger dorsal 

 fin. I estimate the length of the fish at well over twenty feet. 



The Basking Shark has been recorded from various localities in Australia and New 

 Zealand, 2 but I can find only one record from southern South America. 3 



1 Norman, 1933, Proc. Zool. Soc, p. 1121. 



2 Whitley, 1934, Mem. Queensland Mus., x, p. 196. Whitley has replaced the name Cetorhinus, Blainville 

 (1816) by Halsydrus, Fleming (1809), but as the latter name was given to a supposed "sea serpent" of the 

 Orkney Islands, which afterwards was said to be a Basking Shark, there would appear to be little justification 

 for interfering with a well-established name. Tetroras, Rafinesque (1810), is of very doubtful validity. 



3 Lahille, 1928, Anal. Mus. Nac. B. Aires, xxxiv, p. 325 — Golfo Nuevo, Argentina. 



