Pores ill Fishilatc Crinoids. — Springer. 139 
Henry Blake, of Cambridge, Massachusetts, and may be re- 
lied upon as accurate, so far as human skill and care can make 
them so. In addition to the enlargements noted for the dif- 
ferent figures, the whole plate was drawn twice the size it 
now appears, and reduced by the Heliotype Company to its 
present size by photography. 
I. Are the Figures Correct? 
The charge of misrepresentation is based especially upon 
figures 5 and 9 of Plate VII, of the Monograph of the Crin- 
oidea Camerata. I will consider them, as well as the others, 
in detail. 
Fig. 5. {Decadocrimis tumididiis) M. and G. (figured b\ 
us as D. grandis). This figure only shows a small number of 
pores in the upper part of the ventral sac. They are correctly 
placed as far as they go, except one or two, which Dy in- 
advertence, and from not having his attention specially called 
to it, the artist erroneously represented as at the angles of the 
plates. But in order to show the fact more clearly I have 
figured another specimen of the same species, which shows 
the pores much better, together with an enlarged figure of 
one plate and adjacent parts of others (PI. XVI, figs. 5, 6). 
The pores are very large and prominent. They are for the 
most part, especially in the median row of plates, elongate, 
crossing the sutures at right angles to the middle of the sides, 
elliptic (lozenge shaped) ; and they extend well in from the su- 
ture to the -substance of the plate. They are not all of this 
shape, although all are in the same position at the middle of 
the sides of the hexagonal plates; — some of them are round. 
If the other described specimens are not sufficient, this one 
alTfords the most absolute proof that the pores are not mere 
surface depressions at the angles of the plates; — for here not 
only do they lie at the middle of the sides of the hexagonal 
plates, "on the radial lines," but they actually lie in the ridges 
which pass from plate to plate, instead of between them. This 
is rather exceptional, for usually where there is a stellate or- 
namentation, the ridges pass from plate to plate across the 
angles, and the pores are situated between them; but here 
both pores and ridges cross the sides of the plates and neither 
of them the angles. Five other specimens of this species show 
the same structure. 
