ICHTHYOLOGICAL COLLECTIONS OF THE ALBATROSS. 395 
, Family HEPTATREMIDA. The Borers. 
| 1. Polistotrema stouti (Lockington). 
4 Numerously represented from stations 3343 Seger ed Cape Flattery, Washington, 
| 516 fathoms) , 3348 and 3350 (near Point Arena, Cal.; 455 and 75 fathoms). The species 
was not taken in Alaska. 
a Family PETROMYZONIDA. The Lampreys. 
} 2. Entosphenus tridentatus (Gairdner). 
'  Aspecimen, 11 inches long, presented by the Alaska C ommereial Company, had 
| been taken in one of the small streams of Unalaska Island. It appears not to differ 
| from specimens taken in Monterey Bay, California, with which we have compared it. 
| 
( 
| 3. Raja parmifera Bean. 
The most abundant of the five species which were taken in Alaskan waters. 
Eleven specimens in all were secured, distributed among 10 dredging stations in 
Bristol Bay (8252, 3259, 3267, 3270, 3272, 3281, 3282, 3292, 3293, 3310, and 3313), the depth 
| ranging from 16 to 68 fathoms. 
| The specimen from station 3270, a female, showed the following characters: 
Uniform dark olive-brown above, without distinct lighter areas; lower side white, 
the posterior margins of the disk blackish. 
- Width of mouth 1% times in its distance from tip of snout; the latter distance half 
greatest rostral width.. Teeth, 30-24. A series of 30 large spines (24, 28, 28 in three 
other specimens) on median line of back, the anterior one over middle of branchial 
region, two of the series occupying the space between the dorsal fins. A single 
‘strong spine on each shoulder (two of these in most specimens). Prickles on disk 
comparatively very coarse, with conspicuously stellate bases, not crowded, arranged 
in somewhat definite areas. “A scattered group on terminal half of snout (in other 
individuals not always recognizable); a patch on anterior and one on posterior por- 
tion of orbital rim connected by a line of smaller prickles; a band along the anterior 
and one along the posterior borders of pectoral fins, the two usually not continuous 
at the angles; ventral fins with smaller prickles. A well-defined band along each 
side of median line, continued backwards as conspicuous lateral bands on tail, along 
the middle of which they increase in size, becoming spines. Both dorsals prickly. 
A small patch of minute prickles on under side of snout (not present in all speci- 
mens). The disk is otherwise smooth. 
In the male specimen from station 3282, the armature is essentially as described 
above, the prickles being smaller, and the lateral series on tail scarcely enlarged. 
A band of prickles covers all of the angle of pectorals inside the band of bucklers. 
The snout is naked, except a marginal band, and a patch on tip which extends back- 
wards a short distance on median line. A definite patch of stronger prickles on 
anterior and one on posterior portion of orbital rim, connected as before by a single 
series. Thesespatches of orbital prickles are very different from the single series of 
definitely placed orbital spines, characteristic of R. rhina, R. binoculata, and R. inor- 
nata. A series of 25 strong spines along median line, a single spine on each shoulder. 
Bucklers arranged in 22 series, with 5 in the widest series. The dorsal bands of 
prickles do not reach the shoulder. Color, light brown, a single pale spot as large 
as eye at base of each pectoral fin, without definite margins, and not ocellated. 
A young female, 205 mm. long, from station 3315, is brown, with scattered, ill- 
defined black spots, of which two are larger and occupy the position at base of pec- 
torals in which the ocellated spots of other species are found. A pair of round white 
spots, without darker border on base of pectorals more posteriorly; a pair of smaller 
light spots on tail at end of basal fourth. Prickles coarse, covering all of disk and 
tail, except a roundish area on each side of median line, above the branchial region. 
Family RAJIDA. The Skates. 
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