196 
MEMOIRS OF THE QUEENSLAND MUSEUM. 
Family HA LS Y DR I L)JE . 
Genus Halsydrus Fleming, 1809. 
( Plate XXIX : Fi gures 1 -3 . ) 
Halsydrus Fleming, Scots Mag. 1809, p. 7 ; Brewster’s Edinb. Encycl. xi, 1817, p. 713, 
and Philos. Zool. ii, 1822, p. 380. Haplotype, Halsydrus pontoppidiani Fleming. 
Based on the “ Sea Serpent” of Stronsav, Orkney Islands, which was later 
identified as a Basking Shark. 
Tetroras Rafinesque, Carat. Ale. X. Gen. Spec. Sicil., April 1, 1810, p. 11. Haplotype, T. 
angiova Rafinesque {fide Jordan, Gen. Fish, i, 1917, p. 77). 
Tetnoras Rafinesque, Analyse Nat. 1815, p. 93, Nom. nud. { fide Sherborn). 
Cetorhinus Blainville, Bull. Sci. Soc. Philom. Paris, Aug. 1816, p. 121 ( fide Sherborn). 
Haplotype C. gunner i Blainville = Squalus maximus Gunner — Linne {fide Jordan, 
Gen. Fish, i, 1917, j). 95). 
5 el ache Cuvier, Regne Anim. ed. 1, ii, “ 1817” = Dec. 1816, p. 129. Haplotype, Squalus 
maximus Blainville = Linne. Id. Schinz, Das Thierreich (Cuvier) 1822, p. 220. 
Id. Cuvier, Regne Anim. ed. 2, ii, 1829, p. 396. Id. Lesson, Diet. Class. Hist. 
Nat. v, 1829, p. 597. 
Selanche Jarocki, Zoologiia, iv, 1822, p. 452 {fide Sherborn). 
Selachus Minding, Lehrb. Naturg. Fische 1832, p. 52 {fide Sherborn). Id. Yarrell, Hist. 
Brit. Fish, ii, 1836, p. 296. Id. Pavesi, Ann. Mus. Civ. Stor. Nat. Genova 
xii, 1878, p. 416. Emend, pro. Selache Cuvier. 
Ceteorhinus Agassiz, Nomenel. Zool. 1846, Index. Univ. p. 75. Emendation for “ Geterhinus ” 
Blainville, 1816. Type, Squalus maximus Linne, by present designation. 
Polyprosopus Couch, Hist. Fish. Brit. Is. i, 1862, p. 67. Logotype, Squalus rashleighanus 
Couch, selected by Jordan and Evermann, 1896, Id. Gill, Proc. Acad. Nat. Sci. 
Philad. 1864, p. 207. 
? Hannovera Van Beneden, Bull. Acad. Roy. Belg., xxxi. 1871, p. 504. Orthotype, 
H. au-ata Van Beneden {fide Jordan, Gen. Fish, iii, 1919, p. 360). Id. Smith 
Woodward, Cat. Foss. Fish. Brit. Mus. i, 1889, p. 429. Fossil Shark. 
T have not seen Rafinesque’s original description of Tetroras , but Jordan 
and Evermann, in 1896, note it as stating ‘ Two dorsals;' one anal; four 
gill openings ; tail unequal, oblique ; snout blunt ; teeth rasp-like ; a keel on 
each side of tail : eyes very small ; gill openings rather large ; length about 
6 feet. Called Angiova at Palermo." They regard it as applicable to Cetorhinus 
but suggest that it may be a melange of Isurus and Heptranchias, the latter 
now being called Anciova at Palermo. The rasp-like teeth and blunt snout, 
however, preclude Isurus and one hesitates to make scientific identifications 
on the treacherous basis of vernacular names, especially as Heptranchias has 
seven gill slits and the basking shark has only five, the last of which is 
sometimes overlooked by casual observers, hence the name Tetroras. 
The earliest name for this genus appears to be Halsydrus Fleming, 
based on the famous “ Sea-serpent ” of the Orkney Is. which was later shown 
to be a basking Shark, II. maximus (Linne). 
