80LBNOGA8TRB8. I : 



Flo. .V A. Done-terminal sense-organ at the surface of the cuticle. 

 l: 

 C. trf. M evagination of Uw epidermis, (x 124.) n catide ; to. dcfso~tertuiiil 



iso mniii ; p. epidermis ; M. circular muscular UyT ; /*/. pedicle. 

 Pros). 6-1 1. Transverse sections through the anterior extremity. ( x 53.) 

 of. ulterior mncotu gland. 

 be. boccal commissure. 

 *y. buccal nerve. 



e. proximal caecum of the intestine. 

 ec. cartilaginous cells. 

 rg. cerebral ganglion. 

 t. cone with radnla-teeth. (S* text) 

 /. ciliated cavity. 

 i. intotine. 



gr. latero-ventral ganglion. 

 ffil. Utero-donal ganglion. 

 In. lateral nan*. 

 M. moacle. 

 <*. oeaophagna. 

 pk. pharynx. 

 n. radnla iac. 

 g. salivary gland. 

 ey. ventral gland, 

 rn. ventral nerve. 

 M. ventral sac of the radola. 

 Fios. 12-14. Schematic transverse sections through radula, ventral sac of the radula, and 



pharyngeal wall. 



Flo. 15. Salivary glands (?.), opening into the ventral we of the radnla. (x 124.) 

 Flo. 16. Radula-teeth, basal membrane and pharyngeal wall. ( x 380.) 

 Fio. 17. Radnla-teeth. (x 780.) 



Fio. IH. Distal portion of the ventral sac of the radnla. ( x 330.) (Stt text.) 

 FIGS. 19-23. Transverse sections through the distal extremity, (x 29.) 

 a. atrium. 



et>. ciliated bands. (Stt text) 

 at. cloaca! dnct. 

 el. cloaca. 

 t*. cloacal-spicnle. 

 yp. ganglion poster! us snperiu* with commissure. 



i. intestine. 

 In. lateral nerve, 

 n. distal nerves. 

 p. pericardium. 

 I*, praedoacal organ. 

 r. rectum. 

 r. ventricle, 

 r/i. ventral nerve. 



Fio. 2 1. Transverse section through a cloacal-picale. (x 880.) 

 Fio. 25. Genital products in the pericardium. (Stt text) (x 460.) 

 Fio. 26. Blood-corpuscles. (Sw text) (x 780.) 



