297 
pentagonal; this may, as stated above, be the case also in typical A. 
regularis, but a comparison of such specimens (PI. XII. Fig. 16) with 
the variety shows that in these the outer part of the interradial area is 
flattened and fairly distinctly marked off from the somewhat elevated 
arms, while in the variety the whole interradial area forms a regular, 
Fig 11. Asterina regularis. 
Dorsal skeleton of typical form (a) and of variety a (b). ^/i. 
level plane. The plates along the dorsal side of the rays are 
arranged in very regular longitudinal series, while in the typical 
form the arrangement of these plates is generally more or less 
irregular, or the serial arrangement is indistinct on account of the 
numerous small secondary plates (Figs. ll.a b). These latter are 
very sparsely developed in the variety, while, on the other hånd, 
the primary plates are larger in the variety than in the typical 
form. The spines covering the disk plates are similar in both forms, 
but in the variety they cover only the proximal top part of the 
plate, leaving a naked distal part, which appears to be of a somewhat 
coarser structure. The marginal plates are slightly more elongate 
in the variety. The characters of the oral side are as in the typical 
form; one of the specimens has three furrow spines in more than 
half the length of the arm, the other has two furrow spines in 
nearly the whole lengih of the arm. — The colour of the two 
(dried) specimens is white. 
Variety b. (PI. XII. Fig. 18). Four small specimens from Pa¬ 
terson Inlet, Stewart Isl., found under stones on the coast (18/XI. 
14). The largest is only 7 mm in diameter. Two of them are pen¬ 
tagonal, while the other two have the arms fairly distinet. What 
makes this form look rather different from the typical form is the 
