296 HIROSHI OHSHIMA 
ten-tentacled specimens some are often found having a pair 
of small and bud-like tentacles given out ventrad from each 
of the lateral radial canals, as seen in nos. 3 and 8 in Table ITI. 
These are the ninth and tenth. As to which of these two should 
appear first, a specimen represented in Text-fig. 8 and no. 2 
in Table IIT gives an indication. Here the right one of them 
only is present, and thus the young is nine-tentacled (Text- 
TEXT-FIG. 9. 
Diagrams showing the sequence of appearing of tentacles in 
Cucumaria echinata(A)and Holothuria floridana 
(B). Viewed from behind anteriorly. I= primary tentacles ; 
I’ = same appearing last (dotted lines indicate the later position 
of tentacular canals); 6-10 = secondary tentacles numbered 
according to the order of appearing; pv = Polian vesicle ; 
st = stone-canal. 
fic. 9, a). There seems to be a considerable period before the 
appearance of the last two, as noticed by Mitsukuri. 
It is very interesting to find that this order of appearance 
of the secondary tentacles in Cucumaria coincides precisely 
with that observed by Edwards in Holothuria flori- 
dana (12, pp. 217-20; Diagram I). As stated above, the 
five primary tentacles of H. floridana arise in a manner quite 
different from those of Cueumaria. But the sixth arises 
dorsad from the right ventral radial canal, and the seventh, in 
opposition to it, dorsad from the left ventral radial canal 
