333 
spines. The blade carries here as in the mandible delicate hairs 
near the cutting edge. 
In the cirri the spines are remarkably few in numbers. The 
rami of cirrus I are very unequal; the shorter ramus has 8 seg¬ 
ments and measures only one third of the longer ramus, which 
has 36 segments. The armature of cirrus IV is very characteristic: 
the basal and median segments of the anterior ramus have two 
adjacent, clawlike hooks on their distal half, the lower pointing 
downwards almost parallel with the axis of the ramus; one long 
bristle is seated at the distal side of the spines. In the basipodite 
several clawlike spines are arranged in a single median row, de- 
creasing in size towards the middle of the segment, the basal part 
of which is devoid of spines. 
The segments of cirrus V and VI have only two or three pairs 
of anterior bristles; the distal pair is very long, the next very 
small, and the third consisting of only two very short hairs if at 
all present. 
The penis is almost twice as long as cirrus VI, annulated and 
all but destitute of hairs. 
Acasta madvepovicola n. sp. 
Off Jolo; ab. 25 fathoms. 25/III 14. One specimen embedded in a madre- 
porarian coral. 
Compartments feebly granulated with little prominent, radiating 
ridges externally. Carino-lateral plate only consisting of radius and 
ala, reaching to the basis; no opening between the basal parts 
of the coarsely built plates. Radii broad, with a little oblique, cre- 
nulated margins; margin of the alae oblique, and smooth. Basis 
bowlshaped with radiating shallow ridges externally. Shell white. 
Opercular plates thin; scuta with transversely striated ridges of 
growth, with prominent long articular ridge and deep pit for the 
adductor. Tergum with a broad spur confluent with the basi-scutal 
angle, and with all but invisible crests for the depressor. 
The species (Fig. 69) is rather globose with a strongly arched 
large rostral compartment; the carina is shorter and nearly 
straight, and the opening of the shell almost parallel with the basis. 
The lateral compartment is broadly triangular and strongly arched. 
