SOLENOGASTRES. 13 



Fir;. 5. A. Dorso-tenninul sense-organ at the surface of the cuticle. 



B. ill. in the cuticle. 



C. id. as evagination of the epidermis, (x 124.) cut. cuticle ; dto. dorso-terminal 



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

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

 /iff. anterior mucous gland. 

 be. buccal commissure. 

 Iff. buccal nerve, 

 c. proximal caecum of the intestine. 



cc. cartilaginous cells. 

 '//. cerebral ganglion. 



en. cone with rachila-teeth. (See text.) 

 /. ciliated cavity. 

 /. intestine. 



///'. latero- ventral ganglion. 



gd. latero-dorsal ganglion. 



//(. lateral nerve. 



m. muscle. 



oes. oesophagus. 



ph. pharynx. , 



rs. radula sac. 



sff. salivary gland. 



vg. ventral gland. 



I'll, ventral nerve. 



vs. ventral sac of the radula. 

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



pharyngeal wall. 



FIR. 15. Salivary glands (sff.}, opening into the ventral sac of the radula. (x 124.) 

 FIG. It). Radula-teeth, basal membrane and pharyngeal wall, (x 33n.) 

 FIG. 17. Radula-teeth. (x 7*0.) 



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 2'J.) 

 a. atrium. 



rl>. ciliated bands. (See text.) 



cd. cloacal duct. 

 cl. cloaca. 



rx. cloacal-spicule. 

 !/ps. ganglion posterius superius with commissure. 



i. intestine. 

 //(. lateral nerve. 

 n. distal nerves. 

 p. pericardium. 

 po. praecloacal organ. 

 r. rectum. 

 v. ventricle. 

 ///. ventral nerve. 



FIG. 21. Transverse section through a cloacal-spicule. (x 330.) 

 FIG. 25. Genital products in the pericardium. (See text.) ( x 480.) 

 FIG. 26. Blood-corpuscles. (See text.) (x 780.) 



