XIII 



[. Anterior aorta. 

 11. a. ramus to lower caecal lobe. 



6. r. to adjacent walls of stomach and caecum. 



c. r. to caecal folds. 



d. r. to pancreas, 

 r. to dorsal plexus, 

 r. to blood gland, 

 r. to siphonal retractors, 

 r. to liver. 



r. to nuchal retractors and mantle, 

 r. to cephalic retractor and part of liver. 



. r. to median salivary gland, 

 r. to eye. 

 r. to siphon, 

 r. to pharynx, 

 pedal ramus. 



21, 



31, 



41. 



51, 



61. 



71. 



81, 



91, 



101, 



111. 



121. 



131, 



141. 



151 



161, 



171, 



rami to the five arms. 



II. Posterior aorta. 



12. r. to ink sac. 



22. r. to rectum. 



32. r. to branchial heart. 



42. r. to sperm duct or oviduct. 



52. lateral pallial artery. 



62. median pallial artery. 



72. r. to mantle. 



82. r. to fin. 



92. arterial plexus., 



III. Genital aorta. 



IV. Branchial vein. 

 V. Nephridial sinus. 



1^ vein from rectum. 



25. V. from liver. 



35. v. from gonad. , 



45. V. from heart. 



55. V. from caecal folds. - • 



65. ventro-lateral mantle vein. 



75.. V. from gill muscle and nerve. 



85. V. from blood gland. 



95. V. from sperm or oviduct. 



105. V. from nidamental gland. 



115. V. from venous plexus. 



VI. Anterior vena cava. 



16 



26. 



36. 

 46. 

 56 

 66. 



76. 



86. 

 96. 



106. 

 116. 



V. from ink sac. 

 V. from liver \ , 



upper branch, 

 lower „ 



salivary sinus. 

 V. from eye. 

 optic sinus, 

 cephalic sinus, 

 brachial sinus, 

 inner buccal sinus, 

 outer „ „ 



central brachial vein, 

 superficial brachial vein. 



VII. Posterior vena cava. 



17. 



27. 



mantle vein. 

 V. from fin. 



VIII. Branchial artery. 



Fig. 10. Outer (right) surface of the sperm duct. 



Fig. 11. Inner surface of the proximal portion of the sperm duct. 



Fig. 12. Diagram of the spermatophoric gland. 



App. appendix, the second loop of the sperm duct. 

 Gi. G. ciliated canal of Chun. 



D. vas deferens. 



JDi. small tubular diverticulum from the appendix. 

 D.Pr. duct of the prostata. 

 G.S. genital sac. 



p. penis. 

 Pr. prostata. 



S. G. sperm canal of the first two portions of the seminal vesicle. 

 Sp.S. spermatophoric sac. 

 V. 1. first portion of the seminal vesicle. 

 V. 1.1 accessory lobe of the first portion of the seminal vesicle. 

 V. 2. second portion of seminal vesicle. 

 V. 3. third 



