1903] On the Nemerteans of Norway. 33 



Explanation of Plates. 



bm. = basemeut membrane. 



bv. = blood vessel. 



cc. = ciliated canal. 



corg. = cerebral organ. 



corgl. = glands of cerebral organ. 



cugl. = cutis glands. 



dbv. = dorsal blood vessel. 



ddg. === dorsal lobe of dorsal ganglion. 



dg. = dorsal ganglion. 



ep. = epithelium. 



exd. = excretory duct. 



ext. = excretory tub ules. 



fr. = frontal organ. 



gct. = gelatinous connective tissue. 



gd. = genital duct. 



gl. = glands. 



hf. = head furrow. 



hs. = head slit. 



id. = intestinal diverticulum. 



int. = intestine. 



lbl. = lateral blood lacuna. 



m. = mouth. 



mc. = circular muscle layer. 



mcc. = circular muscle layer of cutis. 



mf. = muscle fibrils. 



ml. = longitudinal muscle layer. 



mli. = internat longitudinal muscle layer 



mlo. = external longitudinal muscle layer. 



ne. = nervous side stem. 



oe. = eye. 



oes. = oesophagus. 



p. = proboscis. 



ps. = proboscis sheath. 



rhd. = rhynchodaeum. 



st. = stomodaeum. 



t. = testis. 



vel. = vascular cephalic lacuna. 



vg. — ventral ganglion. 



