148 DEEP SEA FISHES. 
Mixonus caudalis sp. n. 
Plate XXXVI. fig.2; Plate XXXIX. fig. 2; Plate LXXIV. fig. 2, Lat. Syst. 
Br. r. 9; D. 97=1035 As 73=8l; Ve2 (1)5 P. 14 = 268 @N6. El-tca. 150); 
Ltr. 28. : 
The following may be added to the generic characters as given by 
Giinther: Branchiostegal rays nine; pyloric cca rudimentary ; a mem- 
branous connection between the lower two rays of the pectorals; pseudo- 
branchizw rudimentary ; an air bladder. 
Body elongate, compressed ; body cavity little more than one third of 
the total length. Head short, one sixth of the total, deeper than wide, 
decidedly convex on the crown, slightly swollen at the top of the snout, 
Snout one third longer than the eye, broad, rounded, not deep. Mouth 
wide, anterior. Maxillary at its end wider than the eyes, extending back- 
ward of the orbit more than the length of the latter. Tongue free at 
its edges, Teeth small, in villiform bands on jaws, vomer, palatines, 
and pharyngeals. Vomerine teeth in three groups, a large median at 
the forward angle, and a small narrow group at each side near the pala- 
tines; rarely the groups are united by a slender band on one or both sides 
of the vomer. Eye normal, small, one sixth as long as the head, one 
half as wide as the interorbital space, three fourths of the length of the 
snout; orbit without the bony supraorbital covering seen in Leucicorus. 
A groove forward of the anterior nostril. Mucous cavities and_ pores 
moderately large, arranged as in Leucicorus but less extensive. Over the 
muciferous cavities the skin is translucent, as if the contents were lumin- 
ous. Gill openings wide; membranes not united, free from the isthmus. 
rom) 
¢ behind the fourth. Pseudobranchiz small. 
ro) 
Gills four, a short openin 
Gill rakers close together, rigid, slender, as long as the eye, upper section 
of the first arch with three rudimentary and a couple of long ones, and 
lower with thirteen or fourteen long ones and four or five rudiments. 
Dorsal origin above the base of the pectoral. Anal origin below the 
twenty-fifth ray of the dorsal. Caudal extending much beyond dorsal and 
anal, with which fins it is united near its base, narrow, acuminate, three 
fourths as long as the head. Pectorals narrow, with two of the lower 
rays free in the greater portion of their length, prolonged beyond the bal- 
ance of the fin, reaching behind the origin of the anal fin. The distance 
