: ICHTHYOLOGICAL COLLECTIONS OF THE ALBATROSS. 435 
shallowly concave instead of deeply so. The plates of the lower lateral ridge do 
‘not in the young bear backwardly directed spinous points as they do in A. monop- 
terygius. The keel in front of the ventral fin, prominent in 4. monopterygius, is 
here nearly or quite obsolete. The same is true of the keel below the eye, and the 
‘oecipital ridge. The plates in front of pectorals also protrude less, and in general 
the angles and prominences are less marked. The space between the dorsal ridges 
‘is less, its greatest width being half length of head behind middle of eye in adults, 
and behind posterior margin of eye in young. In 4. monopterygius the same width 
equals half head behind front of eye in adults, behind middle of eye in young. 
Some of these differences scarcely admit of quantitative statements, but are suffi- 
lciently evident on comparing specimens from the Atlantic and the Pacific. 
General proportions, fin rays, and color are the same in the two species, 
! Taken very abundantly both north and south of the Aleutian Islands and in Bris- 
tol Bay, at depths of 114 t0 121 fathoms. Stations 3213, 3223, 3224, 3225, 3238, 3245, 3246, 
$248, 3250, 3251, 3252, 3253, 3255, 3256, 3258, 3263, 3267, 3272, 3273, 3278, 3280, 3281, 3282, 
3283, 3284, 3285, 3286, 3287, 3291, 3292, 3293, 3294, 3296, 3299, 3300, 3301, 3302, 3303, 3306, 
8309, and 3311. 
_ This species is named for Mr. Barton A. Bean, of the U. S. National Museum, 
| oo whom I have received many courtesies during the preparation of this paper. 
fj 
82. Siphagonus barbatus (Steindachner). 
; Stations 3239, 3240, 3242, 3243, 3244, 3245, and 3258 in Bristol Bay; depth, 44 to 70 
fathoms. The dark band on sides is often yery strongly marked; the barbel varies 
{much in length; the fins vary from dorsal vir to vi1I-6 to 8; anal 9 to 12. 
'B3. Brachyopsis dodecaedrus (Tilesius). 
_ A few specimens taken in Bristol Bay, at stations 3239, 3240, 3242, and 3248; depth, 
44 to 31fathoms. In males the colors are much brighter than in females, recalling B. 
verrucosus. The bars on dorsal fins in males intense black and bright white, instead 
‘of olive brown and whitish, as in females. Males show also a larger black patch on 
last anal rays, and have the interradial membrane of ventral jet black. In none of 
ur specimens does the caudal fin show transverse lines of brown points, as described 
by Cuvier. In both males and females the caudal is dusky or black; the median 
tays lighter, the outer ones white. Dorsal rx or x—7 or 8; anal 14 to 16. In life 
the ground color of upper parts is light olivaceous. The median portion of the 
pectoral fins is largely red, divided by narrow lemon yellow lines into quadrangular 
areas, each of which has a black spot in its center. Median portion of caudal yellow 
at base, becoming reddish distally. A faint, long, reddish streak below lateral line. 
B4. Odontopyxis frenatus sp. nov. (Plate 30.) 
Body slightly depressed, tapering regularly backward from occiput, the depth 
about seven-eighths of the width at base of pectorals. The ridges are prominent, 
the dorsal and dorso-lateral ridges provided with strong spines, the ventral and 
ventro-lateral series with weak or scarcely discernible spines, all decreasing in size 
backward, becoming obsolete on caudal peduncle. Dorsal face deeply concave 
anteriorly, its ridges coalescing from 3 to 4 plates behind the dorsal fin. Other faces 
much less concave, the ventral ridges coalescing 3 or 4 plates behind the anal fin. 
Plates in dorsal series 44 or 45; 5 or 6 pairs between occiput and first dorsal, 9 or 
10 under first dorsal, 2 or 3 between dorsals, 7 or 8 under second dorsal, 17 or 18 
behind dorsals. About 25 plates on breast, consisting of a strong median series 
which bears a well-marked rounded ridge, a strong lateral series at edge of breast 
also projecting, and a number of small plates occupying the concave intermediate 
areas. In young specimens the breast plates have central elevations and bear each 
a backwardly-directed spine. These disappear in adults. A number of small irreg- 
ular plates in front of and on base of pectorals. Membranous intervals behind and 
around vent smaller than in 4. acipenserinus, occupied by eight or nine irregularly 
‘arranged plates, not in pairs and not corresponding to those of the ventral series, 
