138 



ECHINOIDEA. II. 



considerably narrovver than iii flavesccns. — In the anterior petals the number of pores in the anterior 

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

 onh- 2 — 6, the nnmber varying rather mnch. As the pore-bearing piates of the petals are rather large, 

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

 the posterior petals the nnmber is the same in both species. The odd anterior ambulacrum narrovvs 

 conspicnonsly where the fasciole traverses it, which is not the case in flavescens; the number of piates 

 within the fasciole is smaller than in flavesccns^ specimens of eqvial size being compared (7 in capense, 

 ca. 10 in flavescens). 



The tubefeet and their spicules do not present any distinct differences from flavescens; 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 niay well be found in larger specimens of 



Fig. 22. Apical area of Echinocardiut>t capense: the 

 specimen 2511™ in length. s'j. 



Fig. 23. Apical area of Echinocardiurn flavescens ; 

 the specimen limm in length. 5/1. 



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

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

 oi flavescens. The rostrate (PI. XVII. Figs. 6, 16) are more slender, the outer, widened part shorter than 

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

 tridentate pedicellariæ (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 simjily leafshaped (PI. XVII. Fig. 13). Some of the larger specimens (PI. XVII. 

 Fig. 39) recall somewhat the larger rostrate pedicellariæ. The largest tridentate pedicellariæ seen 

 were only o^'""" (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 pedicellariæ (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. 



