182 
Cirri. First pair (Pl. XV, fig. 21): rami unequal, sometimes very unequal. Number 
of segments observed: 13 and 24, 17 and 32, 17 and 25, 13 and 24, 12 and 18. The lower 
segments of the longer ramus are separated only indistinctly, those of the shorter ramus are 
very protuberant. 
Second pair (Pl. XVI, fig. 2): rami slightly unequal. Number of segments observed: 
15 and 16, 18 and 19, 16 and 17, 16 and 17, 14 and 16. Most of the segments are distinctly 
protuberant, with tufts of hairs placed on the tip of the protuberances. 
Third pair (Pl. XVI, fig. 3): rami slightly unequal. Number of segments observed: 
18 and 21, 29 and 30, 23 and 26, 18 and 20. Segments not protuberant, but having, the 
anterior face rounded off. A tuft of hairs is situated on the extremity of this rounding, the 
surface of which, moreover, is furnished with several rows of extremely small teeth. The margin 
of the segment bears no teeth. The thorax bears a tuft of hairs or bristles at the basis of the 
ara cits: 
Fourth and fifth pair with from 45—52 segments. Surface of pedicel of 5'* cirrus 
rough, with numerous minute, spine-like teeth. 
Sixth pair has 54 to 55 segments in one specimen, 70, 75, 59, 58 segments respectively 
in the other specimens. Segments in the middle part of the cirrus (Pl. XVI, fig. 4) as long as 
broad, towards the free extremity longer than broad, towards the basis shorter. As a rule each 
segment has two pairs of very long spines on its anterior face, but sometimes, and then not 
even in both rami, some of the middle segments have a 3" pair of very small spines. Between 
the spines of each pair, and immediately beneath them, there is a dense brush of short hairs. 
These brushes are stronger, the number of hairs greater, at the basis of the distal pair ot 
spines of each segment. Each segment bears a group of short hairs on the posterior face 
near the upper extremity. The surface of the lower part of the cirrus, to about the 15‘ to 
20th segment, is rough with numerous microscopical spine-like teeth. 
Penis not very elongated, much thicker towards the basis, tapering towards the extre- 
mity. It is furnished, dorsally, near the basis, with a recurved hook-like point. 
Geographical and bathymetrical distribution. Darwin knew this species only 
from the 3 and 7 provinces, which he distinguished for the distribution of the Cirripedia : 
the Indian Archipelago and Australia. WeLTNER (l.c. p. 270) mentions specimens from Shanghai, 
and the ‘Challenger’ collected it near Kobe, Japan at two different places, where the depth 
varied between 14.5 and go m. Its occurrence at different places in the Malay Archipelago 
is proved again by the material collected by the Siboga. It has there been found in shallow 
water only: the greatest depth from which it was dredged during the cruise of H. M. S. 
“Siboga” was ‘up to 4o m.”. The “Challenger” found it in Torres Strait at a depth of 
14.5 m. According to LANCHESTER!, a variety of this species is found at Khota Bharu, Kelantan. 
6. Balanus btmae n. sp. Pl. XVI, fig. 5—11. 
Shell conical, globular near the basis, with small and distinctly toothed orifice striped 
1 LANCHESTER, W. F., The Crustacea of the Skeat-Expedition, Proceed. of the Zoolog. Soc. London. II. 1902. 
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