138 



ECHINOIDEA. II. 



considerably narrower than in fiavcscens. — In the anterior petals the number of pores in the anterior 

 series is larger than in flavescens, viz. 6—7, whereas in fiavcscens of a corresponding size there are 

 only 2 — 6, the number var\ing rather much. As the pore-bearing plates of the petals are rather large, 

 this difference is fairly conspicuous. In the posterior series of the anterior petals and in both series of 

 the posterior petals the number is the same in both species. The odd anterior ambulacrum narrows 

 conspicuously where the fasciole traverses it, which is not the case in flavescens; the number of plates 

 within the fasciole is smaller than in flavescens, specimens of equal size being compared (7 in capensc, 

 ca. 10 in flavescens). 



The tubefeet and their spicules do not present any distinct differences from Jlavescens; to be 

 sure, I have not seen any such large spicules, as are found in flavescens below the disk, but they are 

 not always met with in the latter species either, and they may well be found in larger specimens of 



Fig. 22. Apical area of Echhwcaydium capense; the 

 specimen 25™"! in lenj^th. Vi- 



Fig. 23. Apical area of Eckinocardium flavescens ; 

 the specimen 241"" in length. 5/i. 



capense. — The pedicellarise show partly some differences. The globiferous and ophicephalous pedi- 

 cellaricE (the latter rather numerous on the naked actinal part of the bivial ambulacra) are like those 

 of flavescens. The rostrate (PI. XVII. Figs. 6, i6) are more slender, the outer, widened part shorter than 

 m flavescens ; but small ones of the same form as those oi flavescens (PI. XVII. Fig. 9) also occur. The 

 tridentate pedicellarise (PI. XVII. Figs. 5, 35, 39) have the edges of the blade more or less inrolled or 

 even coalesced in the lower part, the outer part being more spoon-shaped widened; in quite small 

 specimens the valves are simply leafshaped (PI. XVII. Fig. 13). Some of the larger specimens (PI. XVII. 

 ^'S- 39) recall .somewhat the larger rostrate pedicellarite. The largest tridentate pedicellarise seen 

 were only 0-3""" (length of head); doubtless larger ones will occur in larger specimens, and probably 

 they will prove to differ yet more from those of flavescens. The triphyllous pedicellarise (PI. XVI. 

 Fig. 12) differ from those oi flavescens in being serrate almost all round the edge of the blade, only 

 the point being smooth; the outline of the blade is also more rounded than in that species. 



