AtfADEtfUS. 



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, &c. The jaw is solid and composed of 13 ribs. 



at. 



vd. 



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 altivagus. 

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



a single small blunt tooth on the exterior side ; about the 28th from 

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



