PLATE 27. 



Figs. 1,2,4-11. Cro.ss sections of Chaetotlerma montereyensis. (X 40.) Fig. 3. C. nanula. 



Tliroiigh brain region. 



Through heart and eoelonioihii'ts. 



Through junction of jiharynx and stomach. 



Through radula. 



Through labio-buccal gangha and glanils entering jiharynx. 



Through heart and coelomotlucts. 



Dorso-lerminal .sense organ. 



Through suprarectal commissure. 



Through outlet, on left, of coclomoduct. 



Tlu'ougii junction of pliarynx and sloniach. 



Through brain and anterior buccal plate of .small specimen. 



