REGAN—MARINE FISHES, 219 
B. Dorsal and abdominal ridges entire ; no spines on the tail. 
1. A single downwardly directed spine at the angle of pre- 
Onereulnmisndorsalidim withiOmayss 5. . | 2 ss es! olfersii, Cuy., 1829. 
2. Two spies at the angle of praoperculum, one directed down- 
wards, the other backwards. 
Dorsal with 9 rays; supra-anal photophores separated from the pree- 
anals by a very short interspace 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 
preanals by a distance of more than } the length of the supra-anal 
series and from the caudals by a distance greater than the length of 
the supra-anal series 5. hemigymnus, Cocco, 1829. 
From this it will be seen that A. sladeni is intermediate between A. olfersii and 
A. hemigymnus. It agrees with A. olfersii in general form and in the arrangement of 
the photophores, except that the caudal peduncle is more slender and the supra-anal 
and caudal series of plotophores are more widely separated—characters in which it 
appreaches A. hemigymnus, which it also resembles in having two spines at the angle of 
the preeoperculum. 
All the species hitherto described have a wide distribution. A. affinis, A. olfersii, 
and A. hemigymnus 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. heathi, Gilbert, 1905, from the Sandwich Islands, 
seems to be identical with 4A. hemigymnus. Probably A. lychnus, Garm., 1899, from the 
Pacific, will prove to be the same as the North Atlantic A. aculeatus, which has also 
been described by Sauvage from the Indian Ocean. 
Chanide. 
6. Chanos salmoneus, Bl. Schn. 
Chagos Archipelago, Diego Garcia. 
Scopelide. 
7. Neoscopelus macrolepidotus, Johnson. 
Saya de Malha Bank, 300 to 500 fathoms. 
8. Saurus varius, Lacep. 
Maldives, S. Nilandu, 30 to 36 fathoms, Felidu, 34 fathoms, Kolumadulu, 33 fathoms, 
and N. Male, 35 fathoms. 
9. Sawrida nebulosa, C. & V. 
Maldives, 8. Nilandu, 36 fathoms, Felidu, 34 fathoms, and N. Male, 35 fathoms. 
10. Saurida tumbil, BL. 
Maldives, Suvadiva, 44 fathoms, Felidu, 34 fathoms, and Kolumadulu, 33 fathoms. 
Cargados Carajos, 28 to 30 fathoms. 
Bike 
