SCHEME OF CLASSIFICATION 21 



Genus 107 Rhinoscopelus 



coccoi 226 

 Genus 108 Myctophum 



punctatum 227 (Lantern Fish) 

 Genus 109 Benthosema 



arcticum 228 

 Genus 110 Tarletonbeania 

 crenularis 229 

 Family XLVIII Paralepididce. Included in Scopelidae by some. Placed in the order 

 Iniomi by Jordan and Evermann. 

 Genus 111 Arctozenus 

 borealis 230 

 Family XLIX Plagyodontidm. Known also as Alepidosauridse. Placed in the order 

 Iniomi by Jordan and Evermann. 

 Genus 112 Plagyodus 



ferox 231 (Lancet Fish) 

 sesculapius 232 (Wolf -fish: Hand-saw Fish) 

 borealis 233 (Hand-saw Fish) 

 Family L Percopsidai. As a family equivalent to the sub-order Salmopercse of Acantho- 

 pterygii (Acanthopteri) of Jordan and Evermann, and as such, of course, by them, 

 raised in rank. 

 Genus 113 Percopsis 



guttatus 234 (Sand Roller: Trout Perch) 

 Genus 114 Columbia 



transmontana 235 (Oregon Trout Perch) 

 (Series B 1 — Physoclistous Teleostomes, or such in which the air bladder, as a rule, 

 does not communicate with the oesophagus, or digestive tract, by a pneu- 

 matic duct, except in the embryos.) 

 ORDER XI HETEROMP (Spiny Eels) 

 Family LI N otacanthidce 

 Genus 115 Notacanthus 



phasganorus 236 (Spiny Eel) 

 Genus 116 Macdonaldia 



rostrata 237 (Spiny Eel) 

 ORDER XII SELENICHTHYES. 3 (Represented solely by the Op ah— Lampris luna). 

 Instituted as a sub-order by Boulenger to contain Lampris luna. 



'See note to series A, page 13.' 



2 "Closely related to the Haplomi, but separated chiefly on account of the closed air-bladder." Boulenger. 



' 8 "A very aberrant type of uncertain affinities. Its only representative is the opah, Lampris luna a large 

 pelagic fish of wide distribution." Boulenger. 



In the Vllth volume of the Cambridge Natural History (1910) Boulenger places Lampris luna in his division 

 Selenichthyes of the sub-order Catosteomi, but later in the Xlth edition of the 1 Encyclopaedia Britannica (1911) 

 he separates Selenichthyes as a distinctive sub-order, and places the rest of Catosteomi in the sub-order Thora- 

 costei a group proposed by Swinnerton to 'contain Hemibranchii and Lophobranchii. 



