of the Arabian Sea . 
307 
Platytroctes, Gthr. 
11. Platytroctes apus , Gthr. 
Platytroctes apus , Gunther, Ann. & Mag. Nat. Hist. 1878, yol. ii. 
p. 249 ; and Zool. Cliall. Exp. xxii. p. 229, pi. lviii. fig. A. 
One specimen, 6 inches long, answering in every respect 
to Dr. Gunther’s description, except that the eye is larger in 
this specimen, being f- the length of the head and nearly 
twice as long as the snout. 
Station 105, 740 fathoms. 
Aulastomatomorpha, gen. nov. 
Head naked. Body elongate, covered with minute hardly 
imbricate scales. Anterior bones of the head produced into 
a long tube terminating in a narrow mouth. Margin of the 
upper jaw formed equally by the premaxillm and maxilke. 
Uniserial teeth, in the jaws only. Eye large. Gill-cover 
apparently complete. Gill-opening wide below, contracted 
above, and not surpassing the level of the pectoral fin ; four 
gills with narrow laminae. Pseudobranchise almost rudimen- 
tary. Dorsal fin belonging to the caudal portion of the body ; 
no adipose dorsal. Anal fin very long. Caudal forked. 
Pyloric caeca few, small. No air-bladder. 
12. Aulastomatomorpha phospherops y sp. n. 
B. 5? D. 21. A. 41. P.7. V. 6. 
Body elongate and compressed, surrounded from the mid- 
dorsal line behind the nape to the mid-ventral line behind the 
vent by a continuous thick succulent fold of the integuments, 
like, but not so wide as, that of Platytroctes ; its greatest 
height, including this fold, is a little more than ^ of the total 
without the caudal. 
Head low and rather depressed, its length 3^- in the total 
without the caudal ; produced anteriorly into a long tubular 
snout, at the end of which is the small mouth ; completely 
invested by a thick spongy or fungus-like poriferous skin, of 
a brilliant snow-white reflexion, and probably luminous in 
function. This covering is continuous round the branchio- 
stegal rays and opercles with the equally thick velvety mem- 
brane which lines the external parietes of the gill-chambers, 
and it sends a fold backwards to the base of the pectoral on 
each side. 
