Figs. 1-7, 9-10. Sections of Limifossor talpoiiieus; Fig. S. Chaetoderma erudita. 



Side view, living specimen. X 5. 



Anterior end, living specimen, showing extremes of motion of frontal sense organ. 



Lateral view of organs of posterior end of bod}". 



Same of organs in anterior part of body. 



Diagram of radula and muscles that open and close the teeth. 



Section through dorsal sense organ. X 135. 



Lateral view of buccal mass, showing more important nuisdes that operate the radula and 



Brain and labio-buccal nervous system. 



Spicules from middle of body, front and side views. X 110. 



Dorsal view of radula and its supports; portion of dorsal pharyngeal wall removed. 



