portion they are closely and irregularly arranged, in the i nner 
part, from about half way to the peristome, they are 
arranged in a single, almost straight row, the pores 
being wide apart from each ot her, an arrangement the 
more curious as otherwise the pores are usually very crowded at 
the edge of the peristome. Where the arrangement of the pores 
in a single series coinmences the ambulacral area is a little widened 
and from here again evenly narrows towards the peristome. — The 
appearance of the actinal side recalls very much that of some 
species of Echinolampas and Conoclypeus — see f. i. the figure of 
Conoclypeus anachoreta Agass. given by de Loriol (Echinides 
tertiaires de la Suisse. Echinologie helvétique. III. Mém. Soc. pal. 
Suisse. II. 1875. PI. XI. fig. 3) — apart, of course, from the 
position of the anus and from the large tubercles at the ambitus. 
The peristome is small, l U of the diameter of the test (22 mm 
in a specimen of 86 mm diameter of test). The buccal membrane 
contains numerous irregular, fenestrated plates; the buccal plates 
do not carry pedicellariæ or spines. The giils are very small, the 
mouthslits very small and indistinct; the compact plate covering 
the side of the gilis turning towards the test is small and short. 
The spines on the abactinal side and at the ambitus are 
siender and straight, Vs—V 2 so long as the diameter of the test; 
those just below the ambitus are flattened and a little widened at 
the point. On the actinal side the spines are short (ca. 8 mm ) and 
curved, very close set, giving the animal a curious, almost bearded 
appearance. 
The pedicellariæ are as in Astropyga . tridentate, triphyllous 
and claviform ones. (As for the term „claviform“ pedicellariæ I 
must refer to my work on the Ingolf-Echinoidea. I. p. 169. — 
Danish Ingolf Exped. IV. 1. 1903). 
More important differences from Astropyga are not found in 
the pedicellariæ. In the tridentate ones the valves are narrrow 
and elongated, a little widened towards the end, the edge strongly 
serrate; they are wide apart, joining only at the end. In the 
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