594 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
Centrobranchus ehoerocephalus « Fowler. Plate 69, Fig. 1. 
Dorsal 11; anal 18; pectoral 13; ventral 8; scales in a longitudinal series 39; in a transverse series 
10, excluding the median row above and below. 
Greatest depth of body 20 hundredths of total length- without caudal; least depth of caudal 
peduncle 4; length of head 26; diameter of orbit 7; interorbital width 8; length of snout 7.5; projection 
of snout beyond premaxillaries 4.5; length of maxillary 14; distance from tip of snout to front of 
dorsal 45, from front of dorsal to adipose dorsal 29, from front of adipose dorsal to rudimentary caudal 
rays 27, from tip of snout to ventrals 37, from tip of snout to origin of anal 53; base of anal 24; distance 
from last anal ray to base of median caudal ray 26; length of pectoral 12; length of ventral 10. 
Body very slender, ventral outline a little more strongly curved than dorsal; behind the vent 
the form tapers rapidly to the very long and slender caudal peduncle; eyes small, the diameter a trifle 
shorter than length of snout; cleft of mouth strongly convex upward, extending well behind the 
orbits, and overpassed anteriorly by the strongly protruding conical snout; maxillary a very slender 
rod, not at all widened toward tip; premaxillary teeth in a single series; mandibular and palatine 
oeeth in narrow bands; head of vomer with a pair of small round prominences covered with teeth; 
inside the palatine band is a shorter wider patch of teeth on each side median line of roof of mouth; 
preopercular margin entire, but little oblique; gill-rakers nearly obsolete, represented only by 2 to 4 
small protuberances on each limb near the angle, each rudiment bearing minute spines. 
The first dorsal ray is over the fourteenth scale of the mid-lateral series, and over the tips of the 
ventrals; base of ventrals vertically below the ninth scale of this series, first anal ray below the eight- 
eenth; the pectorals fail to reach the middle of ventrals, and the ventrals do not reach the vent. 
Scales thin, with entire edges, rather firmly adherent, those of the mid-lateral series larger than 
the others, but largely concealed anteriorly by the series above and below them; they bear no tubes; 
head entirely invested with scales, which cover mandibles and snout; 2 to 4 series of scales cover 
the basal half of the anterior portions of dorsal and anal fins. 
Photophores arranged as follows: Preoculars 2, one at the upper, the other at the lower end of a 
narrow vertical pigment band on the anterior orbital rim, both minute, but the lower easily visible, 
the upper usually concealed beneath the protruding margin of the frontal in alcoholic specimens and 
made out only on dissection; mandibulars 3; operculars 2, the upper large, the lower minute and rudi- 
mentary beneath the preopercular margin, visible Only on dissection; pectorals 3, the upper very 
slightly above and in front of the base of the upper pectoral ray, the middle immediately below base 
of lower ray, the lower concealed beneath the opercular margin, nearly midway between base of 
pectoral and the second thoracic photophore; thoracics 5, forming with their fellows 2 gently diverging 
series, the first, second, and third pairs usually a little more widely spaced than the others, the third 
and fourth pairs usually less widely spaced than the fourth and fifth; ventrals 4, evenly spaced, the 
lines parallel; anals 5+11, the break in the series over the middle of the anal fin; the second and third 
antero-anals often more widely spaced than the others; caudals 2, in a horizontal line immediately in 
front of the rudimentary caudal rays, more closely approximated than those forming the anal series; 
supraventrals 1, halfway between base of ventrals and middle of sides;' supra-anals 3, forming a very 
oblique gently curved line, the upper encroaching on the mid-lateral row of scales and vertically above 
the vent, the middle one halfway between middle of sides and the fourth of the ventral series and 
slightly in front of the latter, the lowermost occupying a similar position with reference to the third 
of the ventral series, which it more closely approximates; posterolateral 1, over the break in the anal 
series and just below the mid-lateral line; the antero-anals vary from 4 to 7, in the following propor- 
tions, each side of each specimen separately enumerated: 4 in 2 cases, 5 in 64 cases, 6 in 68 cases, 7 in 8 
cases; the postero-anals vary from 9 to 12: 9 in 15 cases, 10 in 84 cases, 11 in 42 cases, 12 on but one side 
of one specimen. 
The combinations 5+10, 5+11, 5+12, 6+9, 6+10, 6+11, and 7+9 are found, those occurring most 
frequently being 6+10, 5+11, and 5+10, in the order named. 
The sum of the anals varies from 14 to 17, as follows: 14 in 3 cases, 15 in 37 cases, 16 in 90 cases, 17 
in 12 cases. 
a This species was recognized by me as new and as representing a new generic type, and the descriptions here given 
had been prepared before the receipt of the paper by Mr. Fowler. 
