XIV 



V.D. vas deferens. 

 V.E. vas eflferens. 



The position of the spermatophore in the several portions of the gland is indicated by a heavy line, 

 with a dot to mark the distal end of the spermatophore. 



Fig. 13. Outer surface of the oviduct. 



Fig. 14. Inner surface of the oviduct. 



a. outer segment of oviducal gland. 



6. inner „ „ 



c. line of attachment of the body wall to the external oviduct. 



Ext. Ov. external oviduct. 



Int. Ov. internal „ 



Mo. internal opening of the oviduct. 



Ov. 01. oviducal gland. 



Fig. 15. Nervous system; right aspect. 



PLATE III. 



Fig. 16. Nervous system; anterior aspect. 



BB.G. branchial ganglion. 8. 



N.G. nuchal cartilage. 9. 



SL.G. stellate ganglion. 10. 



SP.Q. splanchnic ganglion. 11. 



1. bucco-splanchnic connective. 12. 



2. r. to lateral siphonal valve. IS. 



3. r. to siphonal retractor. 14. 



4. pleural nerve and viscero-stellate connective. 15. 



5. visceral nerve and viscero-branchial connective. 16. 



6. r. to cephalic retractor. 17. 



7. r. to siphonal retractor. 18. 



r. to rectum. 



r. to ink sac. 



interbranchial commissure. 



r. to branchial heart. 



branchial nerve cord. 



interstellate commissure. 



nerve from the stellate ganglion to the mantle, 



stellate component of fin nerve. 



visceral „ „ „ „ 



r. to mantle. 



viscero-stellate connective. 



Fig. 17. Median section of the head. Nerves are represented in yellow, arteries in pink, 

 and chitin in blue, muscle and connective tissue in ournt umber. 



veins, cartilage- 



inner buccal sinus, 

 oesophagus, 

 palate, 

 tongue, 

 radula. 



opening of the left salivary gland, 

 duct of median salivary gland, 

 upper mandible, 

 lower „ 



peristomial membrane, 

 lobe of buccal membrane, 

 opening from outer to inner buccal sinus, 

 brachial sinus. 



upper muscle of radular tube, 

 lower „ 



muscle connecting the inner lamellae of up- 

 per jaw. 



