331 
Offjolo; ab. 20 fathoms, Lithothamnion. 17/III 14. One specimen in a 
siliceous sponge; together with Balarais amphitrite. 
Offjolo; ab. 15 fathoms. 21/III 14. One small specimen together with 
Balanus minutus, taken by a diver. 
At first sight the greater specimen from 20 fathoms rather dif- 
fers from Kru gers description (1911), the outlines being much 
more rounded (Fig. 67) than in Kriiger’s drawing, the rostrum 
higher, and the aperture almost regularly triangular. Kriiger also 
Fig. 67. Acasta Dofleini, off Jolo. a entire animal in side view, b carino-lateral coni- 
partment, c and d scutum and tergum, external aspect, e and f inside view of 
tergum and scutum. [a X 2, b—f x 4]. 
speaks of perforations (,,Poren“) in the parities, except in the carino- 
lateral one; in the present specimens the cuticle of the compart- 
ments develops long and strong hairs, or rather flexible spines, 
which are embedded in the sponge tissues and evidently serve to 
fix the cirriped. A doser study reveals that each of these cuti- 
cular spines is placed on a perforation of the compartments so that 
in numbers and arrangement they correspond with the pores men- 
tioned by Kriiger. 
As cited above, Kriiger found that the carino-lateral has no 
perforations; this is easily explained by a study of the plate: there 
is in faet no compartment present, but only the ala and radius of 
the plate, the compartment of which is obliterated (Fig. 67 b); the 
radius, on the other hånd, reaches down to the basis. The latter 
