234 



RADULA OF PULMONATA 



Anostoriia, Odontostomus, Bidiminus, Vertigo, Stroj^hia, Holospira, 

 ClmiS'ilia, and Balea, 



Stenogyridae, including AcJiatina, Stenogyra, and all its suL- 

 o-enera : Central tooth small and narrow, laterals much larg-er, 

 tricuspid, central cusp long, marginals similar, but smaller. 



Achatinellidae : Two types occur : {a) teeth in very oblique 

 rows, central, laterals, and marginals all of the same type, base 

 narrow, head rather broad, with numerous small denticles 

 {Achatinella proper, with Auriculella and Tornatellina, Fig. 





Fig. 140. — Portions of the radula of A, Hyalinla nitidula Drap. , Yorkshire, with central 

 tootli, first lateral, and a marginal very highly magnified; B, Helix jwmatia L., 

 Kent, showing central tooth, laterals, and one extreme marginal, the two former 

 also highly magnified ; C, Orthalicus undatus Brug., Trinidad, with three laterals 

 highly magnified ; D, Cylindrella rosea Pfr., Jamaica, central tooth and laterals, 

 the same very highly magnified ; E, Achatinella vulpina Fer., Oahii, central tooth 

 (f) and laterals, the same highly magnified. 



140, E); (^) central tooth small and narrow^ laterals bicuspid, 

 marginals as in Helix {Amastrcc and Carelia). 



Succineidae : Central and laterals helicidan, Iji- or tricuspid on 

 a quadrate plate, marginals denticulate on a narrow base ; jaw 

 with an accessory oblong plate. 



JcMellidae : Central tooth very small, laterals and marginals 

 like Achatinellidae («). 



Vagimdidar : Central, laterals, and marginals unicuspid 

 throughout, on same plan. 



Onchidiidac : Eows oblique at the centre, straight near the 



