66 
BULLETIN OF THE BUREAU OF FISHERIES. 
The capitulum is narrow and long, widest near the middle, tapering toward both ends, with no 
perceptible cuticle or pubescence. Occludent margin straight, carinal margin obtusely angular in the 
middle. The plates are white, everywhere closely juxtaposed, with sculpture of rather widely spaced 
grooves indicating former growth-periods. 
The scutum is long, with straight, subparallel occludent and lateral margins; basal margin straight, 
at a right angle with the occludent margin. 
The tergum is longer and larger than the scutum, with slightly convex basal and carinal margins, 
the apex erect. 
Carina very short, nearly straight, with apical umbo at the upper fourth of the carinal margin of 
the tergum. Roof flattened; sides rounded, narrow, of nearly equal width throughout. Upper latus 
triangular, the sides and angles subequal. 
Rostrum very narrow, separating the rostral latera in the upper half of their length. 
Rostral latus somewhat wider than high, quadrangular, divided into triangular areas by a low 
diagonal ridge. 
The inframedian latus is triangular, the apex curving toward the occludent margin. The basal 
width is about half the height. 
The carinal latus is enormously lengthened, as long as the Carina. The two latera meet behind in 
a straight suture, diverging only near the apices, which curve ventrad. The carinal outline of the plate 
is convex; the lateral border is divided into two concave arcs, a point between them projecting toward 
the occludent margin. 
The peduncle tapers rapidly to the small base. It is densely covered with ivory-like scales 
arranged in five regular longitudinal rows, of which one is carinal, two on each side lateral. The 
carinal row has 14 scales, which are not so wide as those of the other rows. In the largest specimen a 
few additional scales are interposed between the lateral rows near the base of the capitulum. 
Length of the capitulum 7.3 mm.; breadth 3.5 mm. Length of the carina 3.5 mm.; length of the 
peduncle 4.2 mm. A second specimen is slightly smaller; length of the capitulum 6 mm. 
This curious little species is closely related to 5 . balanoides Hoek, taken by the Challenger in 
5 0 42' S., 132 0 25' E., in 129 fathoms. A number of specimens were seated on a crinoid arm, none of 
them so large as S. gonionotum, the capitulum being only 4.5 mm. long, peduncle with five rows of seven 
scales each. S. balanoides has no rostrum; the dorsal margin is regularly curved, not hunchbacked like 
S. gonionotum , and the inframedian latus is very much narrower. Moreover, the roof of the carina 
is flat in S. gonionotum. The two species seem therefore to be quite distinct. The two specimens of 
.S. gonionotum were detached when received, but from the shape of the impression near the base of 
the peduncle, they were attached to some narrow object, probably a crinoid pinnule. 
GROUP OP SCALPELLUM japonicum. 
The species of this group have one or more longitudinal rows of spines on the segments of the 
posterior cirri, besides the usual pairs on the anterior and along the posterior margins. The posterior 
side is also minutely spiculose. The somewhat allied .S', imperjectum Pilsbry has similar segments. 
This group seems to be rather richly developed off southeastern. Japan. The species are variable, 
and many more forms probably await the dredge. 
Scalpellum japonicum Hoek. [PI. x, fig. 1 to 5, 9.] 
1SS3. Scalpellum japonicum Hoek, Challenger Report, vm, Cirripedia, p. 67.pl. 3, fig. 9, 10 (type locality, Chal- 
lenger Station 235, lat. 34 0 7' N., long. 138° E., in 565 fathoms). 
1907. Scalpellum japonicum metapleurum Pilsbry, Proc. Acad. Nat. Sci. Phila., 1907, p. 360 (type locality 
Albatross station 4972). 
This species was based upon a single example with the capitulum 13.5 mm. long, taken in the Pacific 
off Japan south of the middle of Plondo Island in deep water. 0 Since the published drawing does not 
show clearly the shape of the calcified portion of the upper latus, I have given a view of the right side 
a The shell upon which this barnacle is seated was thought by Hoek to be perhaps a species of Rissoa, but from its 
size and shape, as shown in Hoek’s drawing, I think it may be a Balhybembix ( Turcicula ). 
