118 ACANTHOPTERYGII. 



Genus II. — Lampeis, Betzius. 



Chrysostosus, Laeepede. 



Branchiostegals seven. Body oval, elevated, and compressed. Mouth terminal, 

 protractile, and with a slialloio cleft. Opercular pieces entire. Teeth absent from 

 the mouth. A single, many-rayed, dorsal fin destitute of spines : anal with less rays 

 than the dorsal and also spineless. Ventrals elongated and many rayed. Scales small 

 and very deciduous. Air-bladder large and bifurcated posteriorly. Byloric 

 appendages numerous. 



Geographical distribution. — This beautifully tinted pelagic form is found in 

 the seas of Norway and extending in the Atlantic certainly so far as Madeira : 

 occasional examples are also captured in the Mediterranean. 



1. Lampris luna, Plate XLII. 



Sibbald, Scotia Illus. pi. vi, f. 3 ; Wallace, Orkneys, p. 37 ; Mortimer, Phil. 

 Trans, xlvi, p. 518, t. iv. Zeus cauda bifurca, Stroem, Scendmer, i, p. 323, t. 1, 

 f.'20; Mull. Prod. Zool. Dan. p. 44, No. 370. Opah, Penn. Brit. Zool. (Ed. 1) iii, 

 p. 223, pi. xlii (Ed. 2), iii, p. 299, pi. xlvi. Zeus Strosmii, Walb. Artedi, iii, 

 p. 398. Boisson lune, Duhamel, Peches, iii, p. 74, t. xvii. Zeus regius, Bon. 

 Ency. Method, p. 72, f. civ. The Opah, Low, Fauna Oread, p. 208. 



Scomber pelagicus, Gunner, in Dronth. Selsk. Skr. iv, p. 80, t. xii, f. 1. 



Zeus luna, Gmel. Linn. p. 1225 ; Bl. Schn. p. 96 ; Donovan, Brit. Fish, v, 

 pi. 97 ; Sowerby, Brit. Misc. pi. xxii ; Turton, p. 95. 



Zeus guttatus, Briinn. Nya. Saml. Danske Vid. Selsk. Skr. 1788, iii, p. 398, 

 t. A ; Holten, Nat. Selsk. Skr. v, p. 129 ; Faber, Fische Islands, p. 132 ; Richard- 

 son, Fauna Bor. Amer. Fishes, p. 83. 



Zeus opah, Pennant, Arct. Zool. Suppl. p. 419 ; Shaw, Zool. iv, p. 287, 

 pi. xlii. 



Lampris guttatus, Betzius, Nov. Mem. Acad. sc. Suede, 1799, t. xx, pt. 3, p. 91; 

 Holten, Zool. Dan. iv, t. 144; Cuv. and Val. x, p. 39, pi. eclxxxii (Young) ; Cuv. 

 Begne Anim. 111. Poissons, pi. lxi ; Yarrell, Brit. Fish. (Ed. 1) i, p. 173, c. fig. 

 (Ed. 2) i, p. 194 (Ed. 3) ii, p. 263 ; Parnell, Fish. Firth of Forth, p. 63, pi. 27, and 

 Wern. Mem. vii. p. 223, t. xxvii ; White, Catal. Brit. Fish. p. 38 ; Swainson, ii, 

 p. 251 ; Gaim. Voy. Groenl. Zool. Poissons, pi. x ; Schlegel, De Dieren v. Neder. 

 p. 12, pi. i, f . 5 ; Collett, Norges Fiske, p. 48 ; Winther, Ich. Dan. 1879, p. 15. 



Scomber gunneri, Bl. Schn. p. 38. 



Ghrysotosus luna, Lacep. iv, p. 586, pi. ix, f. 3. 



Zeus imperialis, Shaw, Nat. Misc. iv, pi. cxl and Zool. iv, p. 289, pi. xlii. 



Lampris luna, Bisso, Eur. Merid. iii, p. 341 ; Flem. Brit. An. p. 219 ; 

 Templeton, Mag. Nat. Hist. (2) 1837, i, p. 409; Jenyns, Manual, p. 369; 

 Thompson, Nat. Hist. Ireland, iv, p. 96; Gunther, Catal. ii, p. 416; Steind. Ich. 

 Span. u. Port. 1868, p. 31 ; Mcintosh, Fish. St. Andrew's, p. 174 ; Giglioli, Catal. 

 Pesc. Ital.'p. 27; Moreau, Poiss. France, ii, p. 484. 



Lampris lauta, Lowe, Trans. Zool. Soc. ii, p. 183, iii, p. 6, and Proc. Zool. Soc. 

 1839, p. 80, and Fish. Madeira, p. 27, t. v ; Gray, Ann. and Mag. (3) 1861, p. 192 ; 

 Lowe, Fauna of Norfolk, p. 11. 



Opah, Couch, Fish. Brit. Isles, ii, p. 133, pi. xciii. 



B. vi-vii, D. 53-55, P. 24, V. 14-16, A. 38-41, C. 22, Vert. 20-24/21-22. 



Length of head 3f to 4, of caudal fin 4f to 5, height of body 2\ to 2f in the 

 total length. Bye — placed slightly above the middle of the height of the head, 

 diameter 4 to 5^ in the length of the head, If diameters from the end of the 

 snout. Head a little higher than long, with the profile over the eye slightly 

 concave. Jaws nearly equal anteriorly : the posterior extremity of the maxilla 

 does not extend so far as to beneath the eye. Teeth — Jaws and palate toothless. 

 Bins — the dorsal commences over or slightly behind the base of the pectoral : in 



