Tic Ainitinnif of (\i I'ifitiirs ihifn'<iii/i. 'J I 



The Reproductive System. 



The Hermaphrodite »rh»ii«l lies rinse to the iiiteinal svirt'ace of the 

 third coil of the viseeral mass. It is a rosette shaped ^rhmd. com- 

 posed i)f a numV)er of fiuger-like processes united at the centre of 

 the gland. 



The Hermaphrodite duet is a sinuuus duet lunninir from the her- 

 maphrodite gland to the albumen gland. It leaves the hermaphro- 

 dite gland from alKUit its centre and runs to near the anterior en<l 

 •of the albumen gland, turns back, lying closely applied to the 

 gland, and enters it about its centre on the under surface. 



The Albumen gland is a large compact gland lying behind and 

 partly under the mantle cavity. It is incompletely divided by deep 

 furrows, which give it the appearance of being somewhat lobed. 



The Coimnon dtict leaves the albumen gland from its anterior 

 *nd, and passes forwards, where it divides into vas deferens and 

 ■oviduct. 



The Vas deferens is a long slender tube, which, on leaving the 

 common duct, passes round and under a pectiliar gland, which I 

 shall call the shell gland, and the oviduct, up to the anterior end. 

 where it then turns and runs backwards, to enter the penis on the 

 under surface at the posterior end. 



The Penis is large and strongly muscular. At the posteiioi- t-ud 

 the retractor penis muscle connects it with the ImxIv wall. It opens 

 to the exterior beside the female opening. 



The Oviduct is a broad tube leading fron» the common duct to 

 the exterior. Shortly after leaving the common duct, the oviduct 

 receives the opening of a large wide gland, wjiiih ajtpears to f\nie- 

 tion as a shell gland. 



The gland which I heard call the shell gland is a large thick- 

 walled gland, receiving the duct of the receptaculum seminis, near 

 its anterior end. Internally the lining of the gland is thrown into 

 very large folds, and lying in the grooves between these I found 

 small deposits of calcium carlxmate. 



This is the structure referred to by Semper as a long thick sac. to 

 the under sheathing of which the uterus and long drawn out reeep- 

 taclum seminis are placed, and to its base a retractor. This sac 

 cut open contains a sausage shaped Ixidy, which is free at the 

 hinder end, and appears rounded at the end ; its outer wall was 

 thickly wrinkled and covered with thick epithelium, in the creases 

 ■of which lay calcium carbonate in irregular plates. He then goes 

 on to give a description of the arrangement of the muscles of this 

 •organ. 



