LOLIGO PEALII LESUEUR 253 



ducts; the median salivary gland which appears as a small white 

 body imbedded in the liver on its anterior upper surface. 



15. Open the buccal bulb and remove the radula. Place it 

 in a drop of glycerine on a slide under cover. Examine under 

 low power and make a drawing showing the arrangement and 

 shape of the teeth. 



16. Female. In case the specimen is a female it can be 

 recognized as such by the presence of two long glands situated 

 behind the rectum. These glands are the nidamental glands. 

 They extend backwards between and beyond the branchial hearts 

 which appear as two round bodies at the base of the gills. Two 

 small accessory nidamental glands are partly covered by the 

 forward ends of the nidamental glands. Underneath the nida- 

 mental glands and therefore invisible, is the bilobed nephridial 

 sac. The two nephridiopores are situated on small papillae at 

 the sides of the nidamental glands close to their forward end. 

 The small vessel arising from a median point between the 

 nidamental glands close to their rear ends is the median mantle 

 artery. The two large, bluish, semitranslucent vessels running 

 from under the rear ends of the nidamental glands obliquely 

 toward the mantle are the posterior vena caves. The two small 

 vessels accompanying these veins are the lateral mantle arteries. 

 The mantle veins run from the mantle to the branchial hearts and 

 their course is more or less parallel to that of the gills. A small 

 gill muscle is attached to the base of each gill and terminates 

 in the mantle. Under the rectum and almost completely hidden 

 by it, lies the ink-sac. On the left of the rectum (your right) is 

 the oviduct. The oviducal gland can be seen through the body 

 wall immediately behind the left nidamental gland (on your 

 right). The large ovary, also seen through the body wall (visceral 

 sac) extends backward to the end of the sac. Make a full page 

 drawing showing all organs in situ. 



17. Cut the lateral valves on each side of the funnel along the 

 infundibular cartilage. Pull the funnel gently with your fingers 

 until ycu have completely removed it together with its re- 



