!U DISCUSSION OF SPECIES AND THEIR DISTRIBUTION. 



NANOBRANCHIUM MACDONALDI, Goode and Bean, n. s. (Figure 110). 



Height of body contained 5 in total length; head 31 times. Bye moderate, its diameter 

 contained 5 times in length of head, and considerably greater than that of snout. Mouth 

 extremely wide; rather oblique; with lower jaw somewhat projecting, extending backwards 

 to end of preoperculum. Intermaxillary as long as maxillary, toothed throughout its entire 

 length; both bones narrow and rod-shaped. Gill lamina* very short; gill rakers long, 

 needle-shaped, the longest a little longer than eye. Origin of dorsal nearer extremity of 

 snout than root of caudal, its last ray opi)osite fourth or tilth ray of anal, while the origin 

 of anal is opposite tenth ray of dorsal ; the longest ray of the latter equal to length of head 

 without snout. Adipose fin small, opposite penultimate ray of anal. Caudal much forked. 

 Pectoral composed of three or four small, short, delicate rays. Ventral inserted slightly 

 in advance of dorsal, and extending to vent. Phosphorescent organs arranged much as in 

 N~. nigrum. The glandular organ of white upon the top of the caudal peduncle is much 

 smaller than that described for X. nigrum, but has possibly been partially obliterated; the 

 one on the lower part of the peduncle is much larger. Coloration, purplish blown. 



Badial formula: D. 13; A. 16—17; Scales 4 | 35 | 4. 



Nannobranchium McDonaldi is dedicated to the United States Commissioner of Fish- 

 eries. It appears clearly distinguished from X. nigrum, Giinther, obtained by the Chal- 

 lenger south of the Philippine Islands, at a depth of 500 fathoms. This species is described 

 from a single specimen (Xo. 3947S, U. S. X. M.) 5 inches in length, obtained by the 

 Albatross from station 2553, in 39° 48' N. lat., 70° 36' W. Ion., at a depth of 551 fathoms. 



In an individual (Xo. 494S1, U. S. X. M.), taken by the Albatross from station 2549, in 

 39° 51' 30" X. lat., 70° 17' W. Ion., the pectoral is much more developed than in any of the 

 types, its length being two-fifths that of the head, and- readies nearly to origin of ventral. 



Other specimens were taken by the Albatross as follows: Xo. 35445, 1*. S. X. M., 64 

 inches in length, was taken from station 2182, in 39° 25' 30" X. lat,, 71° 44' W. Ion., at a 

 depth of 861 fathoms; a specimen from station 2103, in 38° 47' 20" X. lat,, 72° 37' W. Ion., 

 at a depth of 1 ,091 fathoms: a specimen 4J inches in length, from station 2379, in 28° 00' 

 15" X. lat., 87° 42' W. Ion., at a depth of 1,467 fathoms: No. 28840, U. S. X. M., 2f inches 

 in length, from station 2546, in 39° 53' 30" X. hit., 70° 17' 30" W. Ion., at adepthof 53S fathoms; 

 six specimens, the largest of them 5J inches in length, from station 2094, in 39° 44' 30" X, 

 lat,, 71° 04' W. Ion., at a depth of 1,022 fathoms; specimens from 37° 20' 42" X. lat,, 74° 

 17' 36" W. Ion., and 39° 57' X. lat., 69° 16' W. Ion., and from station 2680, in 39° 50' X. 

 lat., 70° 26' W. Ion., at a depth of 535 fathoms; and station 2553, iu 39° 48' X. hit., 70° 36' 

 W. Ion., at a depth of 551 fathoms; Xo. 32666, U. S. X. M., from station 2003, in 37° 16' 

 30" X. lat.. 74° 26' 36" W. Ion., at a depth of 641 fathoms; Xo. 35539, U. 8. X. M., from 

 station 2202, in 39° 38' X. lat., 71° 39' 45" W. Ion., at a depth of 515 fathoms; Xo. 35616, 

 U. S. X. M., from station 2201, in 39° 39' 45" X. lat., 71° 35' 15" W. Ion., at a depth of 538 

 fathoms; Xo. 35557, U. S. X. M., from station 2204, in 39 ^ 30' 30" X. lat., 71° 44' 30" W. 

 Ion., at a depth of 728 fathoms; Xo. 35411, U. S. X. M., 110 millimeters iu length, from 

 station 2181, in 39° 29" X. lat., 71° 46" W. Ion., at a depth of 693 fathoms; and a specimen, 

 106 millimeters in length, from station 2102, in 38° 44" X T . lat., 72° 38" W. Ion., in 1,209 

 fathoms; from station 2,530, in 40° 53' 30" X T . lat,, 66° 24' W. Ion., in 956 fathoms. 



SCOPELOSAURUS, Bleeker. 



Scopeloeaurus, Bleeker, citation. 



This genus stands far apart from all the others in the family, having a cylindrical body, 

 with small scales, median dorsal, and teeth in the lower jaw in several series. It is repre- 

 sented by a single species, S. Hoedti, Bleeker, from Amboyua, and it is not known whether 

 or not it is abyssal in its habits. 



