26 
He further showed that the food contained in the ali- 
mentary canal consists of very coarse pieces of sea-weed 
and zoophyte, which have evidently not been subjected to 
the action of any triturating apparatus. 
He exhibited mounted specimens of the suckers, and also 
of the sucker-plates cleaned in potash. He said Professor 
Owen quotes Professor Yalentin with regard to the pedi- 
cellariae, and states that there are three forms of them 
belonging to Echinus lividus, namely, gemmiform, tridactyle 
and ophicephalous pedicellariae ; — these were exhibited as 
mounted specimens, and with them a fourth kind, quite 
distinct from them, and the most remarkable in form ; it has 
long slender jaws like those of a crocodile, armed, in this 
species, with one very long terminal tooth and one tooth on 
each side not far removed from it. He remarked that in 
Echinus sphaera all four kinds of pedicellariae are found and 
agree in their general character with those of Echinus 
lividus, though they are sufficiently different to be readily 
distinguished, and the fourth kind just mentioned has ? 
besides the long terminal tooth, a series on each side, of 
six or seven recurved teeth, suggesting that the name 
sauricephalous would be an appropriate one for this form. 
Mounted specimens of the four kinds of pedicellariae of 
Echinus sphaera were shown for comparison with those of 
Echinus lividus, together with suckers and sucker-plates, 
and the buccal membrane mounted entire to show the ophi- 
cephalous and gemmiform pedicellariae complete and in their 
natural position, 
