341 
Cirrus III again has very unequal rami with 11 and 25 segments, 
the shorter ramus being half as long as the other one; in the 
longer ramus the segments of the basal half are bullate, whereas 
those of the outer half are extended, and armed with only few 
spines. The segments of the posterior cirri are rather short, and 
armed with four pairs of anterior spines. — The penis is annul- 
ated troughout, and all but destitute of hairs; it attains twice the 
length of cirrus VI. 
Genus Elminius Leach. 
Elminius plicatus Gray. 
Carnley Harbour, Auckland Island; on the beach. 29 XI 14. Some few 
depressed and corroded specimens. 
Mahia Peninsula, N.Z.; under stones at low tide. 18 XII 14. Several 
specimens together with Chamæsipho columna. 
Hen & Chicken Island, Hauraki Gulf, N. Z.; 30/XII 14. Some few spec¬ 
imens on the capitulum plates of Mitella sertus. 
Darwin (1853) has given an elaborate description of the 
rugged appearance of this species. He also mentions the peculiar, 
pectinate spines, which occur in such numbers on all segments of 
the rami of cirrus II as not noticed in any other Balanide. 
Also the mouth parts exhibit some peculiarities. The labrum 
(Fig. 74) has a shallow notch, which has a row of short hairs on 
its upper crest; the oral side of the notch 
is adorned with a V-shaped row of 18— 
20 denticles. 
The mand i ble has four teeth, the 
median two, being double. There is a 
short, pectinate part at the lower angle, 
not extending below the latter. — The 
maxilla has two large main spines at 
the upper edge, and below these spines 
a small notch; the lower part of the cut- 
ting edge is armed with a double row 
of heavy spines, and at the lower angle 
four or five finer, short bristles indicate 
a brush. The outer part of the blade is 
rather hairy. 
Fig. 74. Elminius plicatus from 
Mahia Peninsula. a labrum, 
b mandible, c maxilla. [X 33]. 
