The anatomy of Lottia gigantea Gray. 



35 



thelial cells. This gland is rather inconspicuous because it usually 

 does not stain deeply. The middle gland seems to consist of a long 

 string of cells, lying over the ventral gland. It is probably branched 



VAeà.Ol. 







^- V.GL 



Fig. L. Cross section tiirougli glandular margin of mantle, left side, much enlarged. 

 Circump. N circumpallial nerve, Circ. P. V circumpallial vein, Dors. Gl dorsal palliai 

 gland. Gl glands emptying onto lower surface of mantle. Mar. F marginal furrow, 

 3{ed. Gl median gland, S.8t sense stripe of mantle, V.Gl ventral gland. 



in a horizontal plane as portions appear detached through several 

 sections. The cells are smaller than those of the upper gland and 



A S I». ^^H.L 



y'v:2CùCQpa. 



Sh.M. ^' 



Fig. M. Cross section through whole of mantle to show relation of vascular to 

 glandular area. A. Sp arterial spaces, D. 31. L dorsal muscle layer, 3Ia. L mantle laj^pet, 

 3Ia. V mantle veins, distinct from arterial spaces, V. 31. L venti-al muscle layer. 



contain granules. The ventral gland ( V. Gl) is conspicuous as it con- 

 sists of gigantic cells, of various sizes. These cells possess very definite 

 walls and narrow down from a pouch-like form to a narrow neck 



3* 



