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Hair-like spines disposed on the outer face near the extremity of the segments, and are unusually long 
and stout. In this specimen the tips of the rami of this cirrus were broken off, hence the number 
of segments is uncertain. The specimen from Strait Molo had 16 to 17, and 19 to 20 segments 
in the two rami. On outer face near the extremity, groups of 4 to 5 spines are disposed, two of 
which are very stout. On the inner face short, strong, tooth-like spines form groups at the 
basis of the longest pair of spines, on segments 2—14 of the one, and 2—12 of the other 
cirrus, but on the shorter ramus only. 
Fifth pair (broken off in the specimen from Station 299) has nearly equal rami of 19 
and 20 segments in the specimen from Strait Molo. 
Sixth pair: Rami of 21 and 22 segments. Basal segments quadrate, middle segments 
twice as long as broad, distal segments longer still. Number of pairs of spines on inner face 
of segments as a rule 4; very exceptionally a 5 pair is seen (Pl. XIX, fig. 16). Hairs 
on outer face near extremity long and stout. In the specimen from Strait Molo one ramus 
has 24 segments, the other is broken off; all the segments, without exception, furnished with 
4 pairs of spines on their inner face. 
Penis not very long in the specimen from Station 299, much longer in that from 
Strait Molo. The basal or supporting part bears dorsally an excrescence that is not pointed 
however, but blunt at the extremity. The penis is somewhat tapering towards the extremity, 
and here is furnished with slightly stronger hairs, placed in two diverging groups. 
This species was collected by H. M.S. “Siboga’’ at the following places: 
Stat. 51. April 19, 1899. Strait Molo. Depth between 69 and gi m. Bottom: fine grey sand 
or coarse sand with shells and stones. One somewhat larger specimen. 
Stat. 299. Lat. 10°52'.4S., Long. 123°1.1 E. Buka-. or Cyrus-bay, South-coast of Rotti-island. 
Depth 34 m. Bottom: mud, coral, and Lithothamnium. Half a dozen medium- 
sized specimens. 
Stat. 305. Mid-channel in Solor-strait off Kampong Menanga. Depth 113 m. Bottom: stony. 
Four small specimens, with calcareous basis, covered with sponge-like coat; 
surface with longitudinal stripes. (Determination not quite certain, as the oper- 
cular valves are wanting). 
14. Balanus compressus n.sp. Pl. XIX, fig. 17. Pl. XX. fig. 1—7. 
Surface of shell smooth, orifice large, distinctly toothed. Radii broad with the summits 
very obligue, alae also broad with convex surfaces. Scutum with the articular ridge not prominent 
and without adductor ridge. Tergum elongate, placed very close to the basi-scutal angle. 
Opercular valves covered with short hairs, more distinctly so along occludent margin. Labrum 
with four teeth on each side of notch; outer surface of palpus covered with hairs over a 
large part. 
The most typical example of this species is characterised by a large orifice, which is 
toothed (Pl. XIX, fig. 17) in consequence of the shape of the upper extremities of the com- 
partments. The shell is somewhat globular, but flattened laterally, being attached to a rather 
narrow object, the tube of an Annelid; the surface is smooth, without ribs or ridges. The shell 
has a light reddish colour, but is beautifully striated with darker red longitudinal lines. The radii 
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