MOLLUSCA. 53 



is larger, and connected by a much shorter duct with the 

 vagina. 



On the right side of the preparation the heart is well dis- 

 played, and proceeding from it the aorta, divided into its anterior 

 and posterior branches, the former of which passes anteriorly to 

 supply the organs of that part of the body, while the latter 

 passes posteriorly to supply the liver and intestine. 



A yellow glass rod has been placed under the cephalic gan- 

 glia, and a red rod under the sub-cesophageal mass. 



84. A wax model of a Grey Slug (Limax cinereus), pre- 

 pared to shew its general anatomy. 



A. The animal entire. 



B. Anterior half of the animal. A portion of the mantle 

 has been removed in order to expose the rudimentary shell 

 which would not otherwise be seen. 



C. General disposition of the internal organs, in their 

 natural position, on the removal of the integument. 



D. The organs have been partially separated in order that 

 the general disposition of the alimentary canal and the genera- 

 tive organs may be seen. 



E. Designed to shew the salivary glands, the nervous 

 system, and the pulmonary sac; together with the heart and 

 kidney. 



F. The generative system. 



G. The buccal mass laid open to shew the odontophore and 

 the nervous system. 



The numbers affixed denote the different organs as follows : 



1. Buccal mass. 



2. Salivary Glands. 



3. Stomach. 



4. Intestine. 



5. Liver. 



7. Rectum. 



8. Anus. 



9. Renal organ. 



10. Duct of Renal organ. 



1 1 . Ventricle. 



12. Auricle. 



13. Anterior Aorta. 



14. Posterior Aorta. 



15. Pulmonary vessels lining 

 roof of pulmonary sac. 



16. Branches of posterior aorta 

 supplying viscera. 



17. Supra-cesophageal ganglion. 



18. Sub-cesophageal ganglion. 



19. Right and left stomatogas- 

 tric ganglia. 



20. Buccal mass laid open -to 

 show odontophore. 



21. Duct of salivary gland. 



