SOLBNOGASTRBS. 1 3 



Fig. 5. — A. Dorso-terminal sense-organ at the surface of the cuticle. 

 B. id. in the cuticle. 



G. id. as evagination of the epidermis. ( X 124.) cut. cuticle ; dto. dorso-terminal 

 sense-organ ; ep. epidermis ; m. circular muscular layer ; ped. pedicle. 

 Figs. 6-11. — Transverse sections through the anterior extremity, (x 53.) 

 ag. anterior mucous gland. 

 Ic. buccal commissure. 

 Ig. buccal nerve. 

 c. proximal caecum of the intestine. 



cc. cartilaginous cells. 

 eg. cerebral ganglion. 



cm. cone with radula-teeth. {See text.) 



/. ciliated cavity. 

 i. intestine. 



gv. latero-ventral ganglion. 



gd. latero-dorsal ganglion. 



In. lateral nerve. 



m. muscle. 

 oes. oesophagus. 

 ph. pharynx. 



rs. radula sac. 



sg. salivary gland. 



vg. ventral gland. 



VH. ventral nerve. 



vs. ventral sac of the radula. 

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



pharyngeal wall. 

 Fig. 15. — Salivary glands {sg.'), opening into the ventral sac of the radula. (x 124.) 

 Fig. 16. — Radula-teeth, basal membrane and pharyngeal wall, (x 330.) 

 Fig. 17.— Radula-teeth. (x 780.) 



Fig. 18. — Distal portion of the ventral sac of the radula. ( x 330.) {See text.) 

 Figs. 19-23. — Transverse sections through the distal extremity. ( x 29.) 



a. atrium. 



cIk ciliated bands. {See text.) 



cd. cloacal duct. 

 cl. cloaca. 



cs. cloacal-spicule. 

 gps. ganglion posterius superius with commissure. 

 i. intestine. 

 In. lateral nerve. 

 n. distal nerves. 

 p. pericardium. 

 po. praecloacal organ. 

 r. rectum. 

 V. ventricle. 

 vn. ventral nerve. 

 Fig. 24. — Transverse section through a cloacal-spicule. ( X 330.) 

 Fig. 25. — G-enital products in the pericardium. {See text.) ( X 480.) 

 Fig. 26.— Blood-corpuscles. {See text.) ( x 780.) 



