Papers from Dr. Th. Mortensen s Pacific Expedition 
1914 - 16 . 
X. 
Studies on Pacific Cirripeds. 
(With 77 figures in the text.) 
By 
Hjalmar Broch, Kristiania. 
Introduction. 
On the following pages I give an account of the Cirriped 
collections from Dr. Th. M o r t e n s e n’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. G ru 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 
plates; no heed being paid to the different origin of the plates, 
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 
