THE TEETH OF SNAILS. 



273 



Our example is Gonus achatinus, Chemnitz, which possesses from 

 50 to 60 long slightly ciirvecl shafts, each having a poison gland at 

 the base. Each tooth is wonderfully barbed, see fig. 3. 



Fig. 3. 



The barbs in our species are more remarkable than those of many 

 of the other species of the Conidce. On the other hand some of 

 them (e. g., Gonus textile) have a serrated edge to the shaft. 



(h) Rachiglossa (/Jax^f "^ ridge). 



Our examples are JEhurna spirata, Lamarck (fig. 4), belonging to the 



Fig. 4. 



same family as the British "whelk" (Bucdnidct), Nassa ornata, Kiener 

 (fig. 5), Coluvihella terpsiehore, Leathes (fig. 6), a^iid Purpura Uanfordi. 

 Melvill(fig. 7). A few complete rows are illustrated in each figure. 



^izzy 



^___^ 



Fig. 5. 



Fig. 6. 



