SEA-FISHERIES LABORATORY. 401 
test first for sugar in the reagents. At the end of the 
time some of the starch had been hydrolysed, and the 
solution now reduced Trommer’s and Fehting’s solutions. 
The phenyl hydrazine test also indicated the presence of 
sugar. 
Mitra was the first to show that the crystalline 
style contained a digestive ferment (26), which was able 
to convert starch and glycogen into sugar. lle assumed 
from this that the work of the crystalline style was that 
of a ferment. Now, though I have found the ferment in 
the styles of Pecten, the amount of starch which was 
hydrolysed was small, and it is possible, especially if the 
style be regarded as a secretion of the digestive gland, 
that the presence of a ferment is accidental. 
With regard to the question of the origin of the 
style, the tricuspid body and the latter have exactly the 
same structure, and in some specimens appeared to be 
continuous. Further, the tricuspid body is in close 
connection with the lining of the stomach and extends 
into the pockets and openings of the ducts from the 
digestive gland. I think it probable, therefore, that the 
style is secreted by the digestive gland. The cells of the 
alimentary canal, with their long cilia, have not exactly 
the appearance of secreting cells. 
With regard to the various theories named above, 
there are serious objections to most of them. ‘The style 
eannot, moreover. be looked upon as a rudimentary 
structure, since the compartment of the intestine in which 
it is lodged, and the special caecum of the other lamelli- 
branchs are lined with better developed cilia than the rest 
of the alimentary canal. The theory of Barrois (28) that 
diatom frustules, &c., are encased by the substance of the 
style seems hardly sufficient reason for the development 
of.a special caecum and style, when there is no such organ 
