108 HAWAIIAN AND OTHER PACIFIC ECHINI. 



ophicephalous offer some tangible specific characters. The miliary spines are 

 rather solid and slightly swollen at the tip but they retain their multiscalariform 

 character fairly well. 



Key to the Species of Oligopodia. 



Periproct distinctly dorsal; long diameter of mouth transverse recens. 



Periproct distinctly posterior; long diameter of mouth longitudinal epigonus. 



Oligopodia recens. 



Nucleolites recens Milne Edwards, 1836. Cuvier's Regne Animal. Illus. Ed., Zoophytes, pi. 14, fig. 3. 

 Echinobrissus recens A. Ag. et auct. 



Plate 144, figs. 8-11. 



This is one of the characteristic echinoderms of New Zealand. It has 

 been reported also from Madagascar and from Australian Tertiary rocks but 

 these records need confirmation. The pedicellariae are very infrequent but all 

 three kinds, tridentate, ophicephalous, and triphyllous are present. The tri- 

 dentate have the valves (PI. 144, fig. 8) about .40 mm. long, with a somewhat 

 flattened blade, the margin of the distal half of which is strongly toothed ; there 

 is a more or less imperfect loop on the base of each valve (PI. 144, fig. 10). The 

 ophicephalous pedicellariae have the valves (PI. 144, fig. 9) about .18 nun. long 

 with a loop .03-.08 mm. in addition; the margin of the blade is more or less 

 serrate; there seems to be no cross-piece at the tip of the loop of the largest 

 valve. The triphyllous pedicellariae are very hard to find; the valves (PI. 

 144, fig. 11) are wide and flat and only about .05 mm. long. 



Oligopodia epigonus. 



Nucleolites epigonus v. Martens, 1865. Monatsb. Berlin Akad. Win., p. 143. 

 Oligopodia epigonus Duncan, 1889. Journ. Linn. Soc. Zool., 23, p. 177, foot -not o. 



Plate 144, figs. 12, 13. 



In von Martens's later publications he referred to this species as Nudeohu 

 epigonus but it is perfectly clear that he did so because it Beemed to him unde- 

 sirable to use a generic name ending in Uts for a living species, and not because 

 he considered epigonus something other than a typical Nucleolites. The 

 is precisely the same as Cidaris and Cidarites (except that here t lie simple noun 

 antedates the derivative) and these two names are universally regarded as 



