64 
bulletin of the bureau of fisheries. 
A dissected specimen shows that the true shape of the rostrum is very unlike its externally visible 
face. It is wider than high, with concave upper and convex lower margin, as shown in figure 3, an inside 
view of rostrum and rostral latera. 
The inframedian latus is triangular, the base slightly longer than the sides. 
The peduncle is short, with six rows of large erect scales, five to seven scales in each row. It is 
rather copiously hairy. The scales are dull olive-yellowish, those of the carinal and adjacent rows 
edged with crimson. 
The measurements of three individuals follow: 
Length of 
capitulum. 
Breadth of 
capitulum. 
Length of 
carina. 
Diameter of 
carina. 
Length of 
peduncle. 
Mm. 
Mm. 
Mm. 
M m. 
Aim. 
16.0 
9 - 7 
17. 0 
3 - 1 
9. 0 
17. 0 
9. 2 
17. 0 
3 -o 
8 . 0 
17-0 
10. 0 
18.5 
3 -o 
12.0 
The mandible (fig. 1, E) has four teeth and a multispinose lower point. There is a very small 
beard on the lower edge. 
The maxilla (fig. 1, C) has a slightly sigmoid edge, closely spinose. 
The first cirrus has very unequal rami of 8 and 1 1 segments, which are densely hairy. The other 
cirri are of the usual slender form. The second cirrus has many spines on the inner faces of the cirri, 
and five pairs on the anterior side. The third and fourth cirri have a row of about 3 small spines on the 
inner face. The fifth cirrus has rami of about 27 segments, the median ones with four pairs of large and 
one of small spines, and the usual tufts at the posterior sutures (fig. 1, A, 15th and 16th segments of 
outer ramus cirrus v) ; besides these, the inner ramus has 1 to 3 small spines on the inner face of some of 
the median segments (fig. 1 B, nth segment). The terminal appendages have 17 segments (fig. 1, D). 
The penis is extremely long and slender, with some short, very sparsely scattered hairs. 
GROUP OF SCALPELLUM ALBUM. 
A group of Arcoscalpellum; rostral latera rather high; inframedian latus narrowly triangular with 
apical umbo; carinal latus high, with incurved apical umbo. Scales of the peduncle well developed, in 
few (5 or 6) regular longitudinal rows. Small forms, living so far as we know on the pinnules of crinoids. 
The following species belong here : 
a. Rostrum well developed; carina extending downward V-like between the carinal latera. 
Scalpellum album Hoek, Malay Archipelago, 500 fathoms. 
S. weltnerianum Pilsbry, ofF southern Japan. 
5 . pentacrinarum Pilsbry, off Havana, Cuba. 
b. Rostrum minute or wanting; carinal latera enormously long, united in a suture below the carina 
Scalpellum balanoides Hoek, 5 0 42' S., 132 0 25' E., 126 fathoms. 
S. gonionotum. Pilsbry, Goto Islands, Japan. 
Scalpellum weltnerianum Pilsbry. [PI. ix, fig. 5, 6, 7.] 
Type no. 32679 U. S. National Museum. 
Type locality: Albatross Station 4918, 30° 22' N., 129 0 08' 30" E., 361 fathoms, about 90 miles 
WSW. of Kagoshima Bay, Japan; one specimen on a crinoid pinnule. 
The capitulum is fully twice as long as wide; the occludent border is straight, the dorsal border 
arched. The plates are white, with an extremely thin, not hairy, cuticle, and those of the upper whorl 
are separated by distinct but rather narrow chitinous spaces which isolate the carina and upper latus 
except at their bases. All of the plates are sculptured with radial striae or fine riblets, which are weaker 
and worn near the apices; and there are some spaced impressed lines indicating growth periods. 
