279 
at base, in the larger of the two specimens measured, 13 mm, in 
the smaller 8 mm. The general appearance of these two specimens 
thus is very different, the smaller having much slenderer arms. This 
difference is, probably, due partly to the faet that the larger spe- 
cimen was in a ripe con- 
dition (male), the genital 
organs causing a swel- 
ling of the arms. 
Paxillæ on disk and 
middorsal area of arms 
small and crowded, with- 
out any regular order. 
Along sides of arms two 
longitudinal series of 
somewhat larger lateral 
paxillæ. Superomarginal 
paxillæ larger, crescent- 
Fig. 5. Luidia neozelanica. Inferomarginals. ^/i. 
shaped, each corresponding to one inferomarginal plate and to about 
two lateral paxillæ. About 3—6 central and ca. 10 12 marginal 
spinelets on the lateral paxillæ, 1—3 central, ca. 8—10 marginal 
spindets on the middorsal paxillæ. These spinelets are very siender. 
finely thorny (Fig. 6.d). One of the central spines may be slightly 
elongated and more robust than the others. The madreporite small, 
nearly concealed by the paxillæ. 
Inferomarginal plates armed with 2—3 prominent, pointed spines, 
alternating, the upper spine being on every second plate placed 
at the upper edge, on the other, intervening plates further down- 
wards, off the interspace between the first and second spine of the 
former plates (Fig. 5). These plates with the spines placed lower 
down have generally only two spines. — The uppermost spine is 
the longest, ca. 7 mm, equalling about 5 marginal plates in length, 
the middle spine is somewhat shorter than the upper one, the 
lowermost only about half as long as the upper one. The plate is 
otherwise sparsely covered with very siender spinelets, surrounded 
by a rather thick, probably glandular skin. On the adradial end 
of the plate the spinelets are somewhat longer. A close fringe of 
capillary spinelets along the edge of the plates, continuing almost to 
the lower edge. 
