390 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, °9/1. The dotted lines not distinctly visible in the specimen. 
Same of a specimen 8 mm long, 2°41. 
Valve of globiferous pedicellaria, 1°°/1. 
Valve of tridentate pedicellaria, '°°/1. 
Ophiocephalous pedicellaria, 1°°/1. 
Valve of triphyllous pedicellaria, 1/1. 
COM] On RW 
H. L. CLark (Op. cit.) has given some information and some figures of 
the pedicellariz of this species. A few additional remarks and figures may be 
given here. — The globiferous pedicellarie 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 pedicellariz, as he gives their size as 
O,17—O,24 mm. I have found them to attain a size of nearly 1 mm. length of 
