39° 



E. DEICHMANN, I. LIEBERKIND, AND TH. MORTENSEN 



fact that only three genital plates are shown in the figure quoted in »The 

 Panamic Deep Sea Echini » would seem to prove that this figure is incorrect. 

 The genital pores have not yet appeared in the specimen of 8 mm. length. 



Figs. 3 — 8. Nacospatangus gracilis A. Ag. 



Apical system, *"/!. The dotted lines not distinctly visible in the specimen. 



Same of a specimen 8 mm long, ""/i. 



Valve of globiferous pedicellaria, ^'^''/i. 



Valve of tridentate pedicellaria, *®7i- 



Ophiocephalous pedicellaria, ^'^"/i. 



Valve of triphyllous pedicellaria, ^'^7^. 



H. L. Clark (Op. cit.) has given some information and some figures of 

 the pedicellariae of this species. A few additional remarks and figures may be 

 given here. — The globiferous pedicellariae are well enough described by 

 Clark, but his figures are rather indistinct so that I have thought it desirable 

 to give a new figure of a valve (fig. 5). The figure of a valve of a tridentate 

 pedicellaria, given by Clark, is not very characteristic, evidently he has found 

 only small samples of this kind of pedicellariae, as he gives their size as 

 0,17 — 0,34 mm. I have found them to attain a size of nearly i mm. length of 



