220. Lecanoeephalus annulatus Molin, from Roccus lineatus. Head, 
dorsal view, x 300. 
221. Head, ventral view, x 300. 
222. Portion of two dentigerous rows, near middle of body, x 300. 
223. Posterior end, ventral view, showing spicules and papillse. 
X 300. 
224. Undetermined nematode 
from stomach of Macrourus bairdii. 
X 12. 
223. (Esophageal region of a specimen with anterior end slightly 
retracted, x 65. to', Beginning of muscular sheath; to,, to, 
continuation of same posteriorly; i, intestine; oc, oesophagus. 
226. Anterior end of specimen with spines, x 200. 
227. Genital aperture of female, x 300. 
