Papers from Dr. Th. Mortensens Pacific Expedition
1914-16.
X.
Studies on Pacific Cirripeds.
(With 77 figures iii the text.)
By
Hjalmar Broch, Kristiania.
Introduction.
C3n the following pages I give an account of the Cirriped
collections from Dr. Th. Morte nsen's Pacific Expedition in 1914
— 16. The extensive collections afford rich contributions to our
knowledge of the Pacific faunistic features and, moreover, contain
a series of interesting new species, and developing series of
several, especially pedunculated, forms; they thus furnish a good
base for phylogenetic and systematic studies, and I am indeed
thankful to my friend, Dr. Th. Mortensen that he entrusted
me with the treatment of his extensive collections.
Since the days of Darwin our knowledge of this group has
been extensively augmented. Nevertheless the systematic arrange-
ment of the group has as yet only undergone few alterations owing
to the elaborate working method, and the well founded system-
atics of Darwin. The large monographs of Hoek have built
farther on the foundation laid by Darwin. Gru vel, it is true,
has tried to introduce a new systematic grouping; but, as also
pointed out by Pilsbry, he has been rather unsuccessful ; his
system is based mainly upon the numeric occurrence of skeletal
piates; no heed being paid to the different origin of the piates,
and their phylogenetic value, his system is decidedly a step back-
wards, as compared with Darwin. Modern systematists have
therefore not accepted the systematic lines of G ru vel. — Since
Darwin the first real steps forward are due to Pilsbry and
Annandale, and especially the first named scientist has shown
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