32 



SCALIBREGMIDiE. 



basement-layer which is minutely reticulated like a form of chordoid tissue and apparently 

 possesses great elasticity. It stains so deeply that its structure is obscured. The streaks 

 in the hyaline substance of this coat may be connected with modified nuclei assuming 

 the form of elongated corpuscles which may be branched and join other fibres, or these 

 represent fibrillar structures in the hyaline tissue. 



n.c. 



Fig. 102.— Transverse section of the anterior third of Eumenia Jeffreysii, Mcintosh. Letters as before. 



Within 

 upward and 

 pass outside 

 cuticle, and 

 nerve-cords 

 cross below 

 with reerard 



is a thin ]ayer of circular fibres which, reaching the nerve-cords, turns 

 is lost in the oblique and other fibres at this part. Very few fibres, if any, 

 the nerve-cords, which have the thick basement-tissue, the hypoderm, the 

 a special fold externally. The oblique muscles pass down by the side of the 

 and are fixed to the basement-tissue, though it is possible a few fibres may 

 the nerve-cords to join those of the other side, and thus cause ambiguity 

 to the circular fibres (Fig. 103). The upper arch of the body has moderately 



Fig. 103.— Arrangement of the parts in a transverse section of the nerve-cord in Eumenia Jeffreysii, Mcintosh. 



developed dorsal longitudinal muscles, which touch in the middle-line, and somewhat 

 increase in thickness in the neighbourhood of the oblique— inferiorly. The oblique muscles 

 do not seem to affect the outline of the ventral region in any marked degree. The ventral 

 longitudinal muscles are also moderately developed and stretch from the oblique to the 

 nerve-cords. The arrangement of these and the dorsal lean to the type of Arenicola in 

 which no very marked differentiation of the several muscles of the body-wall is apparent. 

 The contents of the intestine consist of fine sandy mud with fragments of crustaceans, 

 sponge-spicules, Foraminifera, Radiolarians, and other organisms. 



