BARNACLES OF JAPAN AND BERING SEA. 
63 
A series of ten specimens was taken by the Albatross at station 4934, Eastern Sea, off Kagoshima 
Gulf, 30° 58' 30" N., i30°32 / E., 152 fathoms, rocky bottom. (No. 386S0 U. S. National Museum.) 
These show that the Challenger example was a very young one. I have therefore thought it well to 
describe the adult stage. 
The oceludent margin of the scutum is slightly convex, that of the tergum a trifle concave. The 
plates are crimson, passing into a dull yellowish tint. The pattern varies somewhat, but there is usually 
a ray of the paler tint down the middle of each of the three larger plates, while the borders have crimson 
rays. In some examples nearly the whole scutum is yellowish. The plates of the lower whorl are 
generally crimson. The narrow sides and rounded ribs bordering the roof of the carina are milk white. 
The flat, sunken roof has a crimson stripe bordering each lateral rib, the middle being pale. The plates 
are covered with a very thin cuticle which is most minutely downy. 
Fig. 1 . — Scalpellum rubrum Hoek. A, 15th and 16th segments of outerramusof cirrusv; B, nth segment of inner ramus 
of cirrus v; C, maxilla; D, terminal appendage; E, mandible. 
The scutum and tergum each has a low median diagonal riblet running from umbo to the baso- 
carinal angle. On both sides of this the surface is sculptured with low, irregular growth-wrinkles, and 
extremely minute growth-striae; and weak fine radial striae may be seen in suitable lights. A low rib 
runs along the scutal border of the upper latus, which is sculptured with growth-wrinkles and indistinct 
radial striae, like the other plates. 
The carina is very long, reaching upward beyond the upper fourth of the length of the carinal 
border of the tergum; and its apex is thrust between the terga, w'hich diverge at the tips. On the roof 
the fine growth-striae are broadly V-shaped. 
The visible portion of the rostrum is small and triangular or oblong (pi. vm, fig. 2). 
