ICHTHYOLOGICAL COLLECTIONS OF THE ALBATROSS. 435 



shallowly concave instead of deeply so. The plates of the lower lateral ridge do 

 not in the yonng bear backwardly directed spinous points as they do in A. monop- 

 terygiuH. The keel in front of the ventral fin, prominent in J. monopicrygius, is 

 here nearly or (jnite obsolete. The same is true of the keel below the eye, and the 

 occipital 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 A. monoptcrygins 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- 

 ciently 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 lU to 121 fathoms. Stations 3213, 3223, 3224, 3225, 3238, 3245, 324G, 

 3248, 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, 

 3309, and 3311. 



This species is named for Mr. Barton A. Bean, of the U. S. National Museum, 

 from whom I have received many courtesies during the preparation of this paper. 



82. Siphagonus barbatus (Steindachner). 



Stations 3239, 3240, 3242, 3243, 3244, 3245, and 32.58 in Bristol Bay; depth, 4^ to 70 

 fathoms. The dark band on sides is often very strongly marked; the barbel varies 

 much in length ; the fins vary from dorsal vii to viii-6 to 8 ; anal 9 to 12. 



83. Brachyopsis dodecaedrus (Tilesius). 



A few specimens taken in Bristol Bay, at stations 3239, 3240, 3242, and 3248 ; depth, 

 H to 31 fathoms. 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 iuterradial membrane of ventral jet black. In none of 

 our 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 

 rays lighter, the outer ones white. Dorsal ix 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. 



84. Odontopyxis frenatus sp. nov. (Plate 30.) 



Botly 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 A. acipensermus, occupied by eight or nine irregularly 

 arranged plates, not in pairs and not corresponding to those of the ventral series, 



