126 
PROCEEDINGS OF THE NATIONAL MUSEUM. 
VOL. XXIV. 
Head and bod}^ naked. Skin along median part of back anterior to 
dorsal, with a peculiar feather-shaped structure; a median elevation 
with short, oblique, lateral branches. 
Dorsal extending a little farther posteriorly than the anal. Caudal 
slightly notched, the lobes rounded. Anal inserted much in advance 
of dorsal. Pectoral rounded, without detached rays on upper edge. 
Ventrals short, free from body posteriorly. 
Color in life translucent, in spirits yelloAvish white; lips with minute 
brownish dots; occiput with a few small spots of same color; median 
Fig. 31. — Leucopsarton petersi, 
dorsal area with small dots; a brownish black line on throat and 
anterior half of belly. Some specimens have the color less intense 
than have others, the small spots on occiput often being absent. 
Described from numerous specimens collected at Niigata, in Echigo, 
presented b}' Dr. C. Ishihawa. We also have representatives from 
Hiroshima. It was not seen elsewhere b}^ us. (Named for Dr. W. 
Peters, of the Universit}^ of Berlin.) 
Measurements of Leucopsafion petersi. 
Length in millimeters 
Deptli expressed in hundredths of length 
Depth of caudal peduncle 
Length of head 
Length of snout 
Width of interorbital space 
Diameter of orbit 
Distance from snout to soft dorsal 
Height of longest dorsal rays 
Distance from snovit to anal tin 
Height of longest anal rays , 
Length of caudal pi'dunele 
LeTigth of caudal fui 
Length of pectoral tin 
Length of ventral fin 
Number of dorsal rays 
Number of anal rays 
39 
36 
36 
13 
13 
14 
8 
1i 
8i 
21 
20 
21 
(i 
5i 
5i 
4 
5 
5 
4 
5 
5 
bl 
61 
60 
10 
11 
6 
55 
55 
54 
12 
n 
7 
21 
21 
21 
14 
15 
15 
14 
17 
14 
7 
6 
17 
13 
13 
13 
17 
17 
17 
32. TRYPAUCHEN Cuvier and Valenciennes. 
Triipauchoi Cuvier and Valenciennes, Hiat. Nat. Poiss., XII, p. 152 (vagina). 
Body elongate, compressed, covered with minute cycloid scales; 
head short, compressed, l)luntly rounded in profile; mouth rather 
small, terminal, oblique, the thick lower jaw very prominent; teeth 
moderate, in bands; tongue inconspicuous, not notched; no barbels; 
gill openings confined to the side, the isthnuis very broad; eyes very 
