74 



worm" elonf^ates, the posterior part of the ri^ht half of 

 the liver passes backwards, so tliat in ti t , its duct 

 opens into the posterior end of the stomach. The anterior 

 and posterior portions of the liver arn nornr;lotoly separa- 

 ted from each other, foiTninc separate liver masses (fig. 

 10). Tlie anterior remains in the foot, and sends its duct 

 to open into the external anterior portion of the stomach. 

 There seems little doubt that it xias this part which Frey 

 and Lenckart observed and described as the salivary r;lands 

 peculiar to Teredo. Tho posterior part of the liver is 

 the larger of the two, and opens by a very large duct into 

 the ventral part of the stomach. It is differentiated in- 

 to two portions, which in structure and apparently in 

 function, are quite distinct from each other, tliough they 

 open into the stomach by the same duct. The more elonga- 

 ted, slii^htly larger portion (fig. 30) lies on the right 

 side, and in structure is like the anterior liver mass of 

 Teredo and the whole liver in other forms of Lamellibranchs- 

 The second portion (fig. 30) lying more on the left side, 

 is different in appearance. Its lobules are larger, with 



larger lumens and thinner walls, which are composed of 

 flattened less glandular cells. The presence of large 



