334 Olive B. Bavies : 



The Hermaplirodite gland (Figs. 2, 10, 11, 12) is compara- 

 tively large. It is situated on the right side- of the visceral mass 

 posterior to the mantle cavity, being surrounded on its left 

 and partly on its ventral sides by the liver. It is a compact 

 gland made up of a number of lobules ; the male elements are 

 arranged in groups towards the centre of each lobule, and the 

 female elements are arranged round these. 



The Hermaphrodite duct (Figs. 2, 11, 12) leaves the herma- 

 phrodite gland from about its centre and runs in a sinuous 

 course to the albumen gland, entering the latter along the 

 right side towards the posterior end. It is a simple, thin-walled 

 tube. 



The Albumen c/la)id (Figs. 2, 9, 10, and 11) is not so com- 

 pact as the hermaphrodite gland. It consists of tubules and 

 lobules. Towards its anterior end it really surrounds the com- 

 mon duct, so that it is only in section that the boundary of 

 duct and gland can be seen, and then with difficulty, owing 

 to the large number of tubules in the gland. 



The Common duct (Figs. 2, 9, 10) is very short, and divides 

 almost before leaving the albumen gland into oviduct and vas 

 deferens. 



The Vas deferens (Figs. 2, 7, 8, 9, 15) is a long narrow duct, 

 ciliated towards its anterior end. It leaves the common duct on 

 the left side and runs up, behind, round, and across the ama- 

 torial organ, across the oviduct, and widens to end in the penis. 



The Penis (Figs. 2, 7, 8) is a large protrusible muscular 

 organ, with the retractor muscle attached towards its posterior 

 end ; just behind this is a large globular swollen portion. The 

 penis leads into a common genital atrium. 



The Oviduct (Figs. 2, 6, 7, 8, 15) is a long tube leaving the 

 common duct on its right side, and running fairly straight to 

 the anterior end, where its walls become swollen and invaginated 

 just before its opening into its common genital atrium. 



The Amatorial organ (Figs. 2, 6, 7, 8, U). What Mr. Hedley 

 describes as " the duct of the genital bladder . . . expanded 

 into a second sac," I take to be the amatorial organ. It is a 

 large swollen body, running right back to the level of the albu- 

 men gland, to end blindly at that region. It has very thick 

 walls beset with numerous glands, which all open into a central 



