Bd VI: 4) 
THE ECHTNOIDEA. 
93 
— In the type specimen all the paired interambulacra are excluded from the peri- 
stome, as shown in the figure quoted (PI. V. 37); in the present specimen this is 
the case with interambulacrum 1., not with 2.; those of the other side I have not 
denuded, so I cannot state how it is with them. — The spines of the plastron were 
all broken, so that I cannot, any more than KOEHLER, give definite information of 
their shape; judging from some spines preserved in most of their length, the point 
is probably only slightly widened. 
Koehler has pointed out the most interest- 
ing feature that the odd anterior ambulacrum is 
of almost the same shape as the paired petals, 
and that the pores are developed in the same 
way in all of them. It is in accordance with 
this fact that the tubefeet are also developed in 
the same way; the abactinal tubefeet of the an- 
terior ambulacrum have no sucking disk and no 
rosette plates, as is, otherwise, generally the 
case; they are sack-shaped gills without spicules, 
quite like the tubefeet of the paired petals. 
There are no distinct subanal tubefeet. In the 
tubefeet at the peristome some few irregular rods 
or fenestrated plates are found below the disk; 
the supporting rods of their filaments are simple, 
not thickened. 
KOEHLER has found only one kind of pedi- 
cellariæ, viz. the interesting two-valved form 
figured in PI. II. Fig. 12 (Op. cit.). I have like- 
wise found this form, which evidently repre- 
sents the tridentate pedicellariæ, in great num- 
bers and different sizes, from quite small to 
0.8 length of head (PI. XIX Figs. 1 — 2, 6, 11, 
22, 26) The valves are narrow, curved, the 
blade being a closed tube, only with a short 
slit downwards from the outer, slightly widened, 
part, where the valves join; in the small ones the blade is open in the whole length. 
There is no apophysis, a very interesting feature, not occurring in the bivalve pedi- 
cellariæ of Abatus. The neck is well developed; the stalk is rather compact, without 
distinct widening above; there is a more or less developed »milled ring» below. — 
Besides this form I have also found globiferous and rostrate pedicellariæ. Only one 
specimen of globiferous pedicellariæ was found, and even a rather badly preserved 
Fig. 25. Actinal skeleton, left side, of 
Amphipn. Lorioli. On the right side the 
outline is somewhat uncertain in the part 
from the mark * to the posterior edge; the 
same is the case with the hindmost right epi- 
proctal plate and with the plates on the right 
half of the peristome, these parts not having 
been denuded. The plates on the periproct 
were not drawn with camera. */»• 
