LOLIGO PEALEII. 139 



light colored organs that 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 papilla. 



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

 posed 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 

 nidamental glands, and the kidneys will be seen in the position 

 described for the male. The kidneys consist of: 



1. The white, somewhat triangular, glandular portions al- 

 ready, noticed, extending from the region of each branchial heart 

 anteriorly, and forming a portion of the walls of the pre-cava?. 



2. The cavities of the organs lying ventrally, and at the sides 

 of the glandular portions. 



