SEA-FISHERIES LABORATORY. 399 
continuous and have the same structure and function. 
The fresh styles are flexible, and very elastic. The colour 
is a translucent brownish-yellow. In some cases the 
style, when removed from the intestine, came out quite 
clean. On other occasions there was a beautiful spiral of 
green substance (like the matter found in the stomach 
and rectum) encircling it, as shown in fig. 36. It might 
also have a dark axial portion. In cross section (fig. 
46, a.) under the microscope, the substance of the style 1s 
seen to be perfectly homogeneous, with no organised 
structure and generally with but little difference between 
the substance forming the axis and that of the periphery. 
There is, however, a very distinct laminated appearance, 
as 1f the style were formed of concentric layers of a colloid 
substance, and this gives it a striated appearance in 
longitudinal section. he dark axis that occurred in one 
specimen was due to a thick dark ring which was 
apparently formed of a similar substance to that found 
encircling the outer surface of some of the styles and, 
like it, arranged in a spiral manner. ‘The concentric 
dark rings seen in transverse section are also probably 
due to the same green food matter from the stomach. 
Barrois, in a detailed account of the structure and 
physiology of the style (28), gives descriptions of the 
chemical composition and reactions; and these are borne 
out by the later work of Mitra, whose analyses show that 
there is about 88 per cent. of water in the style, about 
12 per cent. of proteid, and about 1 per cent. of salts. 
The style is slowly soluble in water, and the solution is 
neutral. The tests made on the style of Pecten agree with 
those of Mitra on Anodon (26) and Barrois on Cardium 
(23). 
The presence of proteid was indicated by the xantho- 
proteic reaction (a white precipitate is given by addition 
