portion they are closely and irregularly arranged , in the inner 

 part, from about half way to the peristome, they are 

 arranged in a single, almost straight row, the pores 

 being wide apart from each other, 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 commences 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 Conodypeus — 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. IL 1875. PI. XL fig. o) — apart, of course, from the 

 position of the anus and from the large tubercles at the ambitus. 



The peristome is small, ^U of the diameter of the test (22"™ 

 in a specimen of 86""" diameter of test). The buccal membrane 

 contains numerous irregular, fenestrated plates; the buccal plates 

 do not carry pedicellariæ or spines. The gills are very small, the 

 monthslits very small and indistinct; the compact plate covering 

 the side of the gills turning towards the test is small and short. 



The spines on the abactinal side and at the ambitus are 

 slender and straight, ^3 — V2 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°""j and 

 curved, very close set, giving the animal a curious, almost bearded 

 appearance. 



The pedicellariæ are as in Astropyga . tridentate, triphylious 

 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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