REGAX — MAKIXE FISHES. 219 



B. Dorsal and abdominal ridges entire; no spines on the tail. 



1. A single downwardly directed spine at the angle of prse- 



operculnm ; dorsal fin with 9 rays 3. olfersii, Cuv., 1829. 



2. Two spines at the angle of praeoperculum, one directed down- 



wards, the other backwards. 

 Dorsal with 9 rays; supra-anal photophores separated from the pra;- 



anals by a very short intersj^ace and from the caudals by a distance 



which is much less than the length of the supra-anal series ... 4. sladeni, sp. n. 

 Dorsal with 7 or 8 rays ; supra-anal photophores separated from the 



praeauals by a distance of more than i the length of the supra-aual 



series and from the caudals by a distance greater than the length of 



the supra-anal series .5. /temii/ymnus, Cocco, 1829. 



From tliis it will be seen that A. sladeni is intermediate between A. olfersii and 

 A. hemigymnns. It agrees witli A. olfersii in general form and in tlie arrangement of 

 the photophores, except that the caudal peduncle is more slender and the supra-anal 

 and caudal series of photophores are more Avidely separated — characters in which it 

 approaches A. hendgymnus, which it also resembles in having two spines at the angle of 

 the praeoperculum. 



All the species hitherto described have a wide distribution. A. affinis, A. olfersii, 

 and A. hemigyimitis have been recorded from various localities in the Atlantic and 

 Indian Oceans. A. caninus, Garman, 1899, from the Pacific Coast of Panama, appears 

 to be a synonym of A. olfersii, and A. heatJii, Gilbert, 1905, from the Sandwich Islands, 

 seerns to be identical with A. hemigymnus. Probably A. lychnus, Garm., 1899, from the 

 Pacific, will prove to be the same as the North Atlantic A. aciilecdus, which has also 

 been described by Saiivage from the Indian Ocean. 



Chanidae. 



6. Chanos salmoneus, Bl. Schn. 

 Cbagos Archipelago, Diego Garcia. 



Scopelidae. 



7. JVeoscopelns macrolepidotus, Johnson. 

 Saya de Malha Bank, 300 to 500 fathoms. 



8. Sauriis varlus, Lacep. 



Maldives, S. Nilandu, 30 to 36 fathoms, Pelidu, 31 fathoms, Kolumadulu, 33 fathoms, 

 and N. Male, 35 fathoms. 



9. Scturida nebulosa, C. & V. 



Maldives, S. Nilandu, 36 fathoms, Pelidu, 31 fathoms, and N. Male, 35 fathoms. 



10. Scturida tumbil, Bl. 



Maldives, Suvadiva, 44 fathoms, Pelidu, 34 fathoms, and Kolumadulu, 33 fathoms. 



Cargados Carajos, 28 to 30 fathoms. 



31* 



