ANADENUS. 



471 



situated together just above the centre of the mantle- margin. 

 The generative orifice at a moderate distance (about 8 or 10 mm.) 

 behind eye-tentacle. 



" Total length 70"0, mantle length 30'0, mantle breadth 20*0 mm. 



" Largest spec. : Shell quadrate, flat, thin, horny, white, with 

 concentric lines of growth, nucleus on right central margin. 



" Major diam. 15*0 mm., minor 10*0 mm. 



" Odontophore, dr. The jaw is solid and composed of 13 ribs. 



Fig. 147. — Anadenus altivagus. 

 (Genital system. Copied from Land and Freshw Moll. India.) 



In the radula the centre tooth is broad, with two small pointed 

 projections at the base; the adjacent laterals are also broad, with 



Fig. 148. — Anadenus altivagiis. 

 (Jaw and radula. Copied from Land and Freshw. Moll. India.) 



a single small blunt tooth on the exterior side : about the 23th from 

 the centre they become much more elongated, and the outer basal 



