BARNACLES OF JAPAN AND BERING SEA. 73 
The penis is very small, about 5 mm. long. It has comparatively few annuli, and is very sparsely 
hairy (fig. 5,B). 
This species has an external recognition mark in the lateral cords, defining a dorsal escutcheon. 
Internally the few-jointed inner rami of cirri v and vi, the reduced terminal appendages, and the com- 
paratively small number of annuli of the short penis, are characteristic. 
A single small example from Albatross station 4892, southwest of the Goto Islands in 181 fathoms, 
seems to be referable to H. vetula. It is no. 38685 U. S. National Museum. 
Heteralepas, species undetermined. [PI. xi, fig. 8, 9.] 
Locality; Albatross station 5049, off the east coast of Hondo Island, Japan, 38° 12' N., 142 0 02' E-, 
in 182 fathoms. 
A single specimen, no. 38682 TJ. S. National Museum, externally perfect, but the internal organs 
wholly wanting, seems to represent an undescribed species. 
The eapitulum is oval; the carinal border is almost evenly arched and is rounded, with no trace of 
a keel; rostral border strongly convex below the orifice. There is a pair of minute narrow, yellowish 
scuta; elsewhere the surface is smooth and somewhat transparent. It is flattened laterally, the sides 
being even a little concave. The orifice is very small, about one-sixth the length of the eapitulum, and 
not in the least tubular. Below it the rostral surface is smooth and rounded, not superficially slit as 
in Alepas pacifica. The peduncle is narrow, very short, and coarsely wrinkled transversely. 
Length of the eapitulum 1 1 mm. ; width 8 mm.; length of the peduncle 4 mm. ; width 3 mm. 
The figures will serve to call attention to this species, which I refrain from naming on account of the 
imperfection of the single specimen. 
Family BALANIDAE. 
Genus BALANUS Da Costa. 
SECTION D. 
Balanus rostratus Hoek. [PI. xn, fig. 6 ] 
1883. Balanus rostratus Hoek, Challenger Report, Zoology, vol. VIII, p. 152, pi. 13. fig. 16-22. 
This species was described from off Kobe, Japan, in 8 and 50 fathoms. The type specimens were 
small, the largest 9 mm. high, 7 mm. in diameter of base. The types were not furrowed exteriorly, and 
the orifice is small. A series from Tokyo Harbor (no. 1814 collections of Academy of Natural Sciences 
of Philadelphia) shows that the species attains a far larger size, up to 27 mm. high and 37 mm. in basal 
diameter. Some notes on the adult examples may be useful. While usually almost smooth, or only 
irregularly roughened, the outer wall is sometimes ribbed in places. The walls and opercular plates 
are invariably white throughout, and the egg-shaped orifice is generally about half as long as the base, 
which is strong and flat. The basal ends of the parietes show square holes, exactly as figured by Darwin 
for B. porcalus of the north Atlantic. The large size of the rostral and diminution of the carino-lateral 
pieces has been duly emphasized by Hoek. The radii are deeply sunken below the parietes, appear- 
ing as small, narrowly triangular or wedge-shaped spaces, which are delicately and closely striated 
transversely. 
The opercular plates agree with those described by Hoek, but are less transparent than his figures 
indicate, though still thin. The longitudinal striation of the scutum is very distinct and beautiful 
though fine, and the transverse ridges are almost lamella-like on the lower part of the plate. They pro- 
ject along the occludent margin. The terga show only weak traces of the depressor-muscle crests. 
Externally there are some very weak longitudinal striae near the carinal margin. The band leading to 
the spur is smooth except for transverse growth-lines; and the surface on both sides of it has extremely 
weak oblique riblets, quite narrow and hardly raised above the level surface. 
This species, I have little doubt, is identical with “some fine, brilliantly white specimens (without 
opercula) from the coast of China” which Darwin alludes to as possibly a species distinct from B. porcatus 
(Monograph on the Cirripedia, Balanidae, p. 259). 
