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anterior margins of the protuberant parts. At the base of the third cirrus, the thorax bears a 
tuft of long and numerous hairs, the free extremity of which is directed backwards 
Fourth to sixth cirri have from 15 to 18 segments in each branch. The anterior face 
of most segments bears four pairs of hairs (PI. XVIII, fig. 19); in some specimens, a few 
segments, the 79g" from the end, even bear a 5" pair of extremely minute hairs. Group of 
hairs disposed at the outer margin, and near the extremity of each segment; it has a single 
longer hair, which, however, is considerably less than the length of the segment. 
Penis broad at the basis, growing narrow, and even very narrow towards the extremity. No 
projecting point on the dorsal side of the penis observed. Penis very long, much longer than the cirri. 
Most specimens of this species, collected at different Stations, were found attached to 
the spines of, probably, different species of Echinida. Often numerous, most of them small, 
specimens are seen crowded together along the surface of the same spine. The species was 
collected during the cruise of the Siboga at the following Stations: 
Stat. 49*. April 14, 1899. Lat. 8° 23'.5S., Long. 119°4'.6 E. Sapeh-strait. Depth 69 m. Coral 
$ and shells. Numerous specimens. 
Stat. 51. April 19, 1899. Madura-bay and other localities in the southern part of Molo-strait. 
Depth 69—91 m. Bottom: fine grey sand, or coarse sand with shells and stones. 
Numerous specimens attached to the spines of an Echinid. (Another sample 
; from the same locality: Strait Molo, is from a depth of 54—go m.). 
Stat. 59. April 26, 1899. Lat. 10°22'.7S., Long. 123°16'.5 E. Western entrance Samau-strait. 
Depth 390 m. Bottom: coarse coral-sand with small stones. A few dry specimens. 
Stat. 302. February 2, 1900. Lat. 10° 27.9.5, Long. 123°28'.7 E. Depth 216 m. Bottom: sand 
and coral-sand. 3 specimens without opercular valves. 
Stat. 310. February 12, 1900. Lat. 8°30'S, Long. 119°7'.5 E. Depth 73 m. Bottom: sand with 
few pieces of dead coral. Group of small specimens attached to the spine of 
an Lchenus. 
General Remarks. This species, according to ANNANDALE’s “On the Cirripedia” 
Supplem. Report XXXI of Herdman’s Report on the Pearl Oyster Fisheries of the Gulf of 
Manaar, published 1906, Part V, p. 148, is found also in the Gulf of Manaar (Ceylon). It 
was found attached to a piece of dead coral.- Neither BorrapatLeE nor ANNANDALE inform us 
at what depths their specimens were collected; I think we may conclude from this fact, that 
they did not come from considerable depths. The Siboga dredged it at depths varying from 
54—90 m., and also in deep water, at depths of 216 and 390 m. | must point out, however, 
that these specimens from greater depths (from Stations 59 and 302) are small and incomplete 
(without opercular valves) and that their determination, in consequence, may always be considered 
as somewhat uncertain. Species showing such considerable variation with regard to the depth 
they inhabit, are not common in this genus; where it is the case we should ascertain if such 
forms from different depths, which look as if they belong to the same species, do not show 
more or less important differences in details of structure. In the present instance this was 
impossible by the incompleteness of the specimens from deep water. 
BorRaDalLE proposed for this species a new section of the genus Ba/anus. | explained 
on p. 157 of this report why I could not agree with this proposal and what in my opinion 
would be a better subdivision of the genus. 
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