BARNACLES OF JAPAN AND BERING SEA. 
65 
The scutum is narrow, with the beak reaching over the base of the tergum. The basal margin 
makes a right angle with the occludent margin, and is less than half its length. The diagonal ridge is 
acute in its lower part. 
The tergum is about three times as long as wide, with straight occludent and basal margins. The 
carinal margin is straight except near the lower angle, where it becomes convex. The apex of the carina 
lies in the middle of the carinal margin. The surface of the plate is lightly concave near the occludent 
margin. 
T'he carina is regularly and strongly arched throughout, with rounded roof. In section it is U-shaped. 
The sides are wide near the base, pass gradually into the roof and taper regularly toward the apex, near 
which an extremely narrow intraparietal area is visible through the cuticle. The lines of growth descend 
V-like on the roof. 
The upper latus is quadrangular, more than twice as long as wide. The scutal border is much the 
longest and is concave; tergal border straight, somewhat serrate; carinal border slightly convex; basal 
border very oblique and straight. The lower angle of the plate is concealed under the apex of the 
inframedian latus. The umbo is terminal above. 
The visible part of the rostrum is lozenge-shaped or rather narrowly pointed-oval, with regularly 
convex sides and a ridge down the middle. 
The rostral latus is about as high as wide, with straight and equal scutal and lateral borders meeting 
at an angle of about 6o°. The basal margin is very short, and the rostral margin is concave. 
The inframedian latus is narrowly triangular, the height more than double the basal width. It 
is longer than the adjacent edge of the rostral latus, and toward the apex it curves slightly toward the 
carina. 
The carinal latus is higher than wide, with the acute apical umbo curving scutad and situated at 
the suture between carina and upper latus. The carinal border is longest, strongly arched; upper 
border concave; the lateral margin is somewhat concave. The surface of the plate is divided by a 
curved diagonal line from the apex to the baso-lateral angle separating the sunken lateral area from 
the strongly convex carinal area. In carinal view, the carinal latera meet at the base, their carinal 
edges forming a long V. 
The peduncle tapers strongly toward the base. It is closely covered with strongly imbricating and 
laterally interlocking subtriangular white scales, which under a high power are seen to be finely striated 
from summit to base. The scales form six regular longitudinal rows, of fourteen scales each. 
Length of the capitulum n mm.; greatest width 5 mm. Length of the carina 8.2 mm.; width 
near the base 1.5 mm. Length of the peduncle about 4 mm. 
A single example was taken. In order to preserve this entire, I was compelled to forego examination 
of the internal organs. It is closely related to 5 . album Hoek described from the Malay Archipelago 
in 500 fathoms, but that species seems from the description and figure to be smoother, more compressed, 
and larger. Hoek writes of .S. album: “surface smooth * * * when studied with the microscope 
the beautiful striation of the valves distinctly appears”. In S. weltnerianum the costation is distinctly 
visible to the naked eye. 5 . -weltnerianum is also related, though rather distantly, to Scalpellum penta- 
crinarum Pilsbry, 0 a West Indian species also living on the pinnules of crinoids. The peculiar armor 
of the peduncle is the same in the two species, which further agree in the structure of the carina and the 
general shape of the other plates; but the sculpture and proportions of the individual plates are quite 
diverse. The very sparsely scattered hairs mentioned in my preliminary description are, I am now 
disposed to think, foreign growths. 
This species is named in honor of Herr W. Weltner of the Museum der Naturkunde in Berlin, author 
of several useful papers on cirripedes. 
Scalpellum gonionotum Pilsbry. [PI. ix, fig. 2, 3, 4.] 
Type no. 38678, U. S. National Museum. 
Type locality: Albatross station 4901, 32 0 30' 10" N., 128° 34' 40" E., 10-20 miles southwest 
of the Goto Islands. 
®U. S. National Museum Bulletin no. 60, p. 55, fig. 20. 
48299° — Bull. 29 — ir s 
