LOLIGO 155 



8. The gills, extending from a point about midway of the 

 body toward the free edge of the mantle. How many are 

 there? How are they attached? Why does an animal that 

 is not swimming continually pump water through the mantle 

 chamber? 



9. The branchial hearts, at the bases of the gills, rounded, 

 light colored organs than can be seen through the membrane 

 covering them. 



10. The median ventral mesentery. 

 If the specimen is a male, notice: 



1. The slender, tapering penis, to the left of the rectum. 



2. The kidneys, white organs to be seen through the mem- 

 branous covering, between the bases of the gills. From this 

 position they taper anteriorly for half an inch or more and 

 send small lobes posteriorly. 



3. The openings of the kidneys near their anterior ends, on 

 small papillae. 



4. The conical posterior portion of the viscera. This is 

 composed of a large visceral sac and portions of the sexual 

 organs. 



Draw the animal, showing the points observed. 



If the animal is a female, notice: 



1. The pair of large, white nidamental glands that cover a 

 portion of the rectum and the greater part of the ink bag. 



2. The openings of these glands at their anterior ends. Do 

 you know the function of these glands? 



3. The small accessory nidamental glands just anterior to 

 the nidamental glands. These have large ventral openings. 

 Just before egg laying they become brilliantly red. 



4. The opening of the oviduct ^dorsal to, and a little to the 

 left of, the left nidamental gland. 



5. The rounded swelling, the oviducal gland on the oviduct. 



6. The mass of eggs that fills the posterior portion of the 

 body. These are in the ovary and oviduct. 



Draw the animal, showing the points observed. 

 Excretory System. — If the animal is a female, remove the 



