318 
is also often wanting, so that the internal surface of the scutum 
may be even less sculpturated than in Hoek’s drawing. The shape, 
and sculpturation of the tergum come next to Balanus amphitrite 
forma nivea Darwin. — In the mouth parts Hoek found three 
teeth on each side of the labrum, whereas the present specimens 
have four; also in the mandibles some small differences from 
Hoek’s drawings may be observed, the inferior part being less 
protruded in the present specimens. Yet another small difference 
has to be noted, viz. the constant occurrence of three small spines 
Fig. 58. Balanus minutus from 25 fathoms, oif Jolo. Opercular plates. [X 15]. 
instead of one or two in the median segments of the rami of 
cirrus III. 
As to the three specimens from Jolo 21/m 14 , seated on a flat 
stone, I was at first in doubt, whether they should be referred to 
Balanus minutus. They exhibit a most extraordinary colour: the 
compartments have radiating, dark bluish red, strong lines altern- 
ating with whitish or bluish lines, and crossed by fine lines of a 
somewhat lighter hue than the radiating dark lines. The radii are 
darker bluish red, especially at their summits, whereas the alae 
are white. In one specimen the carinal latera are white all over 
with a few, radiating stripes of a darker shade, the specimen thus 
getting a broad white belt at the carinal third. The scuta have two 
dark red lines along their occludent margin, and a third red line 
near the tergal margin. The specimens are the more fascinating, 
as on account of the even support they are beautifully regularly 
conical with a regularly ovate basal circumference. 
An examination of the opercular plates (Fig. 59) displays the 
nearest relationship with Balanus minutus , although the plates in 
the present specimens are somewhat broader. Besides this, the 
